A psychology professor wants to know whether verbal ability is related to memory quality in current first-year students at her small college. Participants in the study (first-year students at her college) complete an online memory task. The students are first shown a list of 60 words. Next they are shown a list of 10 words that were on the original list. Then they are asked to identify the words on the second list that appeared on the original list. She uses the percentage of words that were correctly recognized on the original list as her measure of memory quality. She also asks the students to report several characteristics such as their age, gender, and verbal SAT score. Each of the 750 first-year students (338 males and 412 females) at her school volunteers to participate. The professor chose 75 students at random to complete the memory task and answer the questions. The average percentage of words that were correctly recognized on the original list was 68%. The professor infers that if all 750 first-year students had completed the study, the results would show that an average of 68% (plus or minus sampling error) of the words were correctly recognized as being on the original list. Which of the following are variables in the study? Check all that apply.
A. The students' verbal SAT scores
B. The students' percentage of words that were correctly recognized on the original list
C. The 75 students
D. The 750 students
Answer:
The variable are
A and B
Step-by-step explanation:
Generally we can define a variable as a name of a placeholder representing a value now considering the option to be selected from we see that
The students' verbal SAT scores is a variable because it is a phrase or a place holder that represent a value (in the is case a numerical value) which the score its self
The second option The students' percentage of words that were correctly recognized on the original list is also a variable because it is a placeholder of a name (in this case a phrase ) that represented the actual value itself
The third option The 75 students is not a variable because it is not representing any value but itself is the value
The third option The 750 students is not a variable because it is not representing any value but itself is the value
Craig saved $10,950 in a year. He saved $75 more than what he saved the previous
month. How much did he save in the first month?
Answer: $10,875
Step 1: Subtract.
10,950 - 75 = 10,875.
Step 2: Add a dollar sign.
$10,875
Hope this helps!
How to find the volume using the formula V=l•w•h to solve for the formula of W
Please help fill it in I’ll mark you as brainlist
Answer:
it so blurry
Step-by-step explanation:
As Mercury revolves around the sun, it travels at a speed of approximately 30 miles per second.Convert this speed to miles per minute. At this speed, how many miles will Mercury travel in 3 minutes? Do not round your answers.
Answer:
Step-by-step explanation:
30*1.6 = 48 km per second
48 * 2 = 96 kilometres
this is not rounded!!
Which of the following numbers is a factor of 555555?
Choose 1 answer:
Answer: You didn't give choices but here are all of them
Step-by-step explanation: 1, 3, 5, 7, 11, 13, 15, 21, 33, 35, 37, 39, 55, 65, 77, 91, 105, 111, 143, 165, 185, 195, 231, 259, 273, 385, 407, 429, 455, 481, 555, 715, 777, 1001, 1155, 1221, 1295, 1365, 1443, 2035, 2145, 2405, 2849, 3003, 3367, 3885, 5005, 5291, 6105, 7215, 8547, 10101, 14245, 15015, 15873, 16835, 26455, 37037, 42735, 50505, 79365, 111111, 185185, 555555
Answer
The factors of 55 are 1, 5, 11, and 55.
Step-by-step explanation:
Which number is divisible by both 5 and 6?
O A) 132,359
OB) 142,645
OC) 164,780
OD) 193,560
Answer: D/193,560
Step-by-step explanation: 193,560 divided by 5 = 38712
193,560 divided by 6 = 32260
Answer:
D
Step-by-step explanation:
Solve by substitution. 5x + 4y = -14 y = -7x - 15
Answer:
(-2,-1)
Step-by-step explanation:
The solution is, x = 3.06 and, y = -7.33..
What is equation?An equation is a mathematical statement that is made up of two expressions connected by an equal sign. In its simplest form in algebra, the definition of an equation is a mathematical statement that shows that two mathematical expressions are equal. For instance, 3x + 5 = 14 is an equation, in which 3x + 5 and 14 are two expressions separated by an 'equal' sign.
here, we have,
5x + 4y = -14 ..(1)
y = -7x - 15
i.e. 7x + y = -15 ...(2)
for solving now, we multiply (2) by 4 , then subtract from (1),
we get,
5x + 4y = -14
20x + 4y = -60
------------------------
15x = 46
or, x = 3.06
and, y = -7.33
Hence, The solution is, x = 3.06 and, y = -7.33.
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2. Simplify the expression (6.8 x 106) +
(3.4 X 106). Express
your answer in
scientific notation.
someone help
Answer:
1081.2x10
Step-by-step explanation:
erika says that no matter how many decimal places she divides to when she divides 1 by 3, the digit 3 in the quotient will just keep repeating. is she correct?n
Answer:
Yes
Step-by-step explanation:
When u divide 1 by 3 the answer is repeating 0.3333....
Solve this equation
-(C^5)⁴
Answer:
[tex]-(C^5)^4\\= -(C^2^0)\\= -C^2^0[/tex]
In Belmont it snowed 1 inch in the morning and 1/5 of an inch in the afternoon. What was the total amount of snowfall ?
Answer:
11/5 or 1 and 2/10
Step-by-step explanation:
9514 1404 393
Answer:
1 1/5 inches
Step-by-step explanation:
It should come as no surprise that the sum of 1 and 1/5 can be written as the mixed number 1 1/5.
Recognizing that 1 = 5/5, the sum of 1 and 1/5 can also be written as the improper fraction ...
1 1/5 = 5/5 +1/5 = (5+1)/5 = 6/5
The total snowfall was 1 1/5 or 6/5 inches.
Write 37/3 as a mixed number
Answer:
12 1/3
Step-by-step explanation:
Answer:
12 1/3
Step-by-step explanation:
1. Divide the numerator by the denominator.
Divide 37 by 3, which equals 12 with a remainder of 1.
37 ÷ 3 = 12 r1
2. Find the whole number.
The whole number is the number of times the denominator divides into the numerator.
3 (the denominator) divides into 37 (the numerator) 12 times, so 12 is the whole number.
Make the remainder the new numerator.
Because the remainder (the leftover value) of dividing 37 by 3 is 12, 1 is the new numerator. The denominator is still 3. So, the mixed fraction is:
12 1/3
Hope it helps...
GIVING EXTRA POINTS AND BRAINLIEST
Answer:
1. d<=200
2. f>=35
Step-by-step explanation:
Answer:
d ≤ 200
f ≥ 35
Step-by-step explanation:
"no more than 200 " means it can be equal to or less than 200. Therefore, we would use the "less than or equal to" sign, or "≤". We would put 200 at the end as it is no more than 200 feet, so 200 is the max.
"at least 35" means it is equal to or more than 35. Therefore, we would use the "greater than or equal to sign" or "≥". Since it is talking about 35 miles, we put the 35 at the end with the sign pointing away from it since 35 is the lesser number.
Remember, the "mouth" or opening of the equality sign always points to the greater or bigger number. You can think of it as an alligator wanting to eat the bigger number.
Hope this helps! :)
Coffee beans sell for $8.00 per pound. How much would 5 1 Over 4
pounds of coffee beans cost?
how do you round 0.313265 to the nearest tenth of a percent
Answer:
.313265*100 is 31.3265
rounded is 31.3
Step-by-step explanation:
Answer:
Step-by-step explanation:
Weights of different sandwiches in two lengths are shown in the table.
Weight of Sandwiches by Length of Roll
6-inch Roll 12-Inch Roll
3
Cheese sandwich
e
Chicken salad sandwich
3
Ib
4
1
Egg salad sandwich
Ib
Vegetable sandwich
Which sandwich's weight is proportional to its length?
O cheese sandwich
O
chicken salad sandwich
o egg salad sandwich
o vegetable sandwich
Answer:
Egg salad sandwich is proportional to its length
Step-by-step explanation:
Weight of Sandwiches by Length of Roll
6-inch Roll 12-Inch Roll
Cheese sandwich [tex]\frac{1}{4}[/tex] [tex]\frac{3}{4}[/tex]
Chicken salad sandwich [tex]\frac{3}{4}[/tex] [tex]1\frac{3}{4}[/tex]
Egg salad sandwich [tex]\frac{2}{3}[/tex] [tex]1\frac{1}{3}[/tex]
For cheese sandwich proportion
[tex]\frac{6}{\frac{1}{4}}=\frac{12}{\frac{3}{4}}\\24 \neq 16[/tex]
So, Cheese sandwich weight is not proportional to its length
For Chicken salad sandwich proportion
[tex]\frac{6}{\frac{3}{4}}=\frac{12}{\frac{7}{4}}\\8 \neq \frac{48}{7}[/tex]
So, chicken salad sandwich is not proportional to its length
For Egg salad sandwich proportion
[tex]\frac{6}{\frac{2}{3}}=\frac{12}{\frac{4}{3}}\\9=9[/tex]
So, egg salad sandwich is proportional to its length
A rectangle is inscribed in a circle
17 in.
18 in.
15 in.
Part A
Calculate the exact area of the cirde. Use the key on the calculator. Round answer to the nearest hundredth if necessary
square inches
Part B
Calculate the area of the rectangle. Round answer to the nearest hundredth if necessary
A=
square inches
Part
Calculate the area of the shaded region
Area of the shaded region
square inches
9514 1404 393
Answer:
A) 226.98 in^2
B) 120 in^2
C) 106.98 in^2
Step-by-step explanation:
A) The diagonal of the rectangle is the diameter of the circle. The area can be found using the formula ...
A = (π/4)d^2
A = (π/4)(17 in)^2 = 72.25π in^2 ≈ 226.98 in^2
__
B) The area of the rectangle is the product of its length and width:
A = LW
A = (15 in)(8 in) = 120 in^2
__
C) The shaded area is the difference between the circle area and the rectangle area:
shaded area = (226.98 in^2) -(120 in^2) = 106.98 in^2
f(x) = 4x + 5
g(x) = -10x² + 8x – 7
Find: f(x) · g(x)
Answer:
G(x) =0.4/0.7
F(x)= 6.6/14
Step-by-step explanation:
G(x)= 0.4/0.7
F(x)= 4(0.4)+5
=6.6
4(0.7)+5
=14.
Dm me if I'm wrong. If not, please mark as brainliest
Given the following geometric sequence find the common ratio {0.45, 0.9, 1.8}
Answer:
Given the following geometric sequence, find the common ratio. {0.45, 0.9, 1.8, ...} 0.45 0.9 2
Given the following geometric sequence {0.45, 0.9, 1.8, ...}, the common ratio is 2. The common ratio = 1.8/0.9 = 0.9/0.45 = 2
Division using place value step by step
2,440 / 8 I know answer. I just need shown steps please & thank you!
Answer:
see attached
Step-by-step explanation:
The usual methods of long division use place value. Each quotient digit is aligned over the appropriate dividend digit to give it the proper place value.
An insurance company regularly reviews official police reports of traffic accidents in a particular region of the country so that it can price its premiums in that region appropriately. A review of a random sample of 582 accident reports showed that in 91 accidents, a teenage driver was found to be at fault.
Required:
Report the upper bound of a 90% confidence interval for the true proportion of accidents in the area that are caused by teenagers, to three decimal places.
Answer:
The upper bound of the 90% confidence interval is 0.181
Step-by-step explanation:
From the question we are told that
The sample size is n = 582
The number of accidents is k = 91
Generally the sample proportion is mathematically represented as
[tex]\r p = \frac{ k}{n} = \frac{582}{91 }[/tex]
=> [tex]\r p = 0.1564[/tex]
Generally the confidence level is 90% , the level of significance is [tex]\alpha = (100-90)\%[/tex]
=> [tex]\alpha = 0.10[/tex]
From the normal distribution table the critical value of [tex]\frac{\alpha }{2}[/tex] is [tex]Z_{\frac{\alpha }{2} } = 1.645[/tex]
Generally the margin of error is mathematically represented as
[tex]E = Z_{\frac{\alpha }{2} } * \sqrt{\frac{\r p (1 - \r p)}{n} }[/tex]
=> [tex]E = 1.645* \sqrt{\frac{ 0.1564 (1 - 0.1564)}{582} }[/tex]
=> [tex]E = 0.0248[/tex]
Generally the 90% confidence interval is mathematically represented as
[tex]0.1564 - 0.0248 < p < 0.1564 -0.0248[/tex]
=> [tex]0.1316 < p < 0.1812[/tex]
Answer and Step-by-step explanation:
Random sample = 582
No. of accidents = 91
P = 91 / 582 = 0.156
Confidence interval for proportion of accidents:
P ± z √(p(1-p)/n)
Where,
n = 582
p = 0.156
z = 1.645
Formula:
P ± z √(p(1-p)/n)
put these values in formula, we get:
= 0.156 ± 1.645 √(0.156(1-0.156)/582)
= 0.156 ± 1.645 √(0.1316/582)
= 0.156 ± 1.645 (0.01483)
= 0.156 ± 0.0244
= (0.1804, 0.1316)
A 28-story hotel building has 18,000 square feet of space for rooms per floor. The average room is 16 ft x 28 ft. How many rooms do you have available?
Answer:
1,120 rooms
Step-by-step explanation:
You need to find out how many hotel rooms are on one floor, and then multiply that by 28. So each room is 16ft x 28ft, which comes out to be 448ft^2. Then to find how many of these rooms go onto one floor, you must divide 18,000 by 448. This equals about 40. So 40 rooms per floor, times 28 floors is: 1,120. And that's your answer! Make sure you understand how we got that. If you have any questions I can help! :)
Rachel works at a bookstore. On Tuesday, she sold twice as many books as she did on Monday. On Wednesday, she
sold 6 fewer books than she did on Tuesday. During the three days Rachel sold 19 books. Create an equation that can
be used to find m, the number of books Rachel sold on Monday.
Equation:
Step-by-step explanation:
1. Let the number of books sold on Monday be x.
2. And, The no. of Books sold on Tuesday be 2x , which is twice as the books sold on monday.
3. Now, The no. of books sold on Wednesday be 2x-6 ,
which is fewer than the books sold on Tuesday.
Where Total no. of books sold on 3 days is 19.
so, The equation be like: x+2x+2x-6 = 19
Answer:
m = 5
Step-by-step explanation:
On Tuesday, she sold twice as many books as she did on Monday. An equation is now formed from this:
I Tu = Mo * 2
On Wednesday, she sold 6 fewer books than she did on Tuesday. An equation is now formed from this:
II We = Tu - 6
During the three days Rachel sold 19 books. An equation is now formed from this:
III Mo + Tu + We = 19
The task says that you should just use one equation to find out how many books were sold on Monday. So take the last equation and replace Tu and We with terms in which Mo occurs.
Substitute equation I into equation III:
IIIa Mo + Mo*2 + We = 19
Replace Tu in Equation II with Equation I:
II a We = Mo * 2 - 6
Substitute equation IIa into equation IIIa:
IIIb Mo + Mo * 2 + Mo * 2 - 6 = 19
Now the equation is converted to Mo (Mo = m):
m + m * 2 + m * 2 - 6 = 19 | + 6
m + 2 m + 2 m = 25
5 m = 25 | : 5
m = 5
Andy saved $80 over the summer from his part-time job. He withdrew 30% of the money to buy new clothes. How much money does Andy have left in
the account after withdrawing the money?
Answer:
$56 I think
Step-by-step explanation:
because 30% of 80 is 24 and 80-24=56
Hydrogen peroxide decomposes back to water and oxygen when exposed to air and light. When bought at a pharmacy for home use, hydrogen peroxide is sold in dark bottles that are labeled as a concentration of 3% by weight. A chemistry student wants to test the concentration of hydrogen peroxide that has been decanted to light and dark bottles, and exposed to air for 10, 20 and 30 hours. The concentration is tested by titration with potassium permanganate, and each sample is tested twice.answer choices are: color/hours, 2, 6, 12, dark/light, 10/20/30 hours, and concentrationquestions: Response variable (s):Factor(s):Experimental Unit (s):Replication(s):Treatment(s):
Answer:Response variable (s)-concentration, (s): Treatment- 2,6,12 hours,Replication(s)-10/20/30 hours
Experimental Unit- dark/light
Factors-color/hours
Step-by-step explanation:
Factors refer to explanatory variables tat are being studied in an experiment. They are manipulated in order to obtain a response (dependent) variable.
Treatments refer to a combination of factor levels in the experiment. Each factor has two or more levels
The experimental unit refers to the physical entities assigned at random to treatments during the experiment.
Replication refers to the number of times the same experiment is carried out. It enhances the reliability of the result of an experiment.
The concentration is tested by titration with potassium permanganate, and each sample is tested twice Replication-10/20/30 hours.
We have to determine
The concentration is tested by titration with potassium permanganate, and each sample is tested twice.
What is hydrogen peroxide?Hydrogen peroxide is a chemical compound that is gaseous in nature. Its viscosity is greater than that of water.
Since it is unstable it slowly decomposes in the presence of light to form water and oxygen.
The control experiment is necessary for the determination of reliability and statistical significance of results obtained.
Replication helps to ensure accuracy and randomization aids us in making quality generalizations from experimental data.
Testing the concentration of hydrogen peroxide decanted to dark bottles is the control experiment.
Testing the concentration of the species after exposure to air for 10,20 and 30 hours is randomization.
Replication refers to the number of times the same experiment is carried out. It enhances the reliability of the result of an experiment.
Testing each sample twice is replication.
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The ratio of butterflies to bees in Lucy's insect collection is 3 to 4. If there are 32 bees, how many butterflies would there be?
Answer:
24:32
Step-by-step explanation:
When I saw that you wrote 'the ratios of BUTTERFLIES TO BEES' it tells me that I need to do the order of But. to Bees. I saw you had 3:4, and you said, '32 bees' I know because of that, 32 bees needs to be the second.
I got my answer, by seeing 4x_=32. I actually multiplied 4x8=32, and then multiplied 3x8 as well, to get 24. Then I got my answer: 24:32!
HOPE I HELPED:)
-Adiel, Age 11, 6th Grade
What is the slope of the line passing through the points (-2, 6) and (1, -3)
Answer:
slope is -3
Step-by-step explanation:
use slope equation, shown in picture hope this helps
Find x - someone help me please
Answer:
-10
Step-by-step explanation:
x + 75 + x + 125 = 180 add like terms
2x + 200 = 180 subtract 200 from both sides
2x = -20 divide both sides by 2
x = -10
A farmer sold 53.2 pounds of carrots and 29.4 pounds of green beans to a restaurant. How many pounds of these two vegetables did the restaurant buy? Explain your thinking. *
Answer:
just add up the 2 numbers pretty simple
Step-by-step explanation:
53.2 plus 29.4
Answer: 82.6 lb
Step-by-step explanation:
Since the restaurant is buying the pounds given from the farmer, add the pounds together.
Add
53.2 + 29.4 = 82.6
Hence, the restaurant bought 82.6 pounds of vegetables.