QUESTION 27For a normal distribution with a mean of 10 and a standard deviation of 5, what is the probability of scoring...

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For a normal distribution with a mean of 10

April 14, 2018

QUESTION 27

For a normal distribution with a mean of 10 and a standard deviation of 5, what is the probability of scoring below a 11.25? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.

1 points

QUESTION 28

For a normal distribution with a mean of 10 and a standard deviation of 5, what is the probability of scoring below a 12.25? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.

1 points

QUESTION 29

For a normal distribution with a mean of 10 and a standard deviation of 5, what is the probability of scoring below a 5? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.

1 points

QUESTION 30

For a normal distribution with a mean of 20 and a standard deviation of 10 what the probablity of scoring above a 17? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.

1 points

QUESTION 31

For a normal distribution with a mean of 20 and a standard deviation of 10 what the probablity of scoring above a 20? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.

1 points

QUESTION 32

For a normal distribution with a mean of 0 and a standard deviation of 1 what the probability of scoring between a -1.75 and 1.25? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.

1 points

QUESTION 33

For a normal distribution with a mean of 0 and a standard deviation of 1 what the probability of scoring between a 1.25 and 2.75? Report your answer in percentage form to the second decimal place. Make sure you use the z table to get the exact answer.

1 points

QUESTION 34

What proportion (in decimal form) of people have a favorite color blue? Round to the second decimal place. Use the following frequency table:

color

frequency

blue

31

green

22

red

69

1 points

QUESTION 35

What is the sample correlation for the following data? Round to the second decimal place.

x

y

34

60

5

1

88

4

1 points

QUESTION 36

What is the sample correlation for the following data? Round to the second decimal place.

x

y

81

87

17

51

54

23

1 points

QUESTION 37

A distribution has a mean of 9 and standard deviation of 2. What is the raw score for a z score of -1.02? Round to the second decimal place.

UESTION 1

A distribution has a mean of 5 and a standard deviation of 7 what is the z score of a raw score of 5. Round to the second decimal place.

1 points

QUESTION 2

A researcher is interested in the effects of a drug therapy on depression in all adults with depression. The researcher gives the drug to 30 adults. She finds an average depression score of 3. The number 3 is a…

sample

population

parameter

statistic

1 points

QUESTION 3

What percentage liked the movie? Round to the second decimal place.

Statistifaction

Frequency

Liked

78

Disliked

10

1 points

QUESTION 4

Find the sample standard deviation for the following values. Round to the second decimal place.

48, 31, 71

1 points

QUESTION 5

What is the sum of squares for the following data? Round to the second decimal place, if needed.

54, 15, 37, 72

1 points

QUESTION 6

If the sample size is 99 what would be the degrees of freedom be for a one sample t-test?

1 points

QUESTION 7

A professor knows his tests generally have an average of 75 with a standard deviation of 10. The professor is now teaching a condensed course in the summer. The summer course is less weeks than his normal classes. The professor is afraid that the summer course is too condensed and negatively affects tests scores. The professor administers his test to his current 64 students in his summer course. The mean of the 64 students is 71. Is there statistically significant evidence to conclude students in his summer class performed worse than students in his regular semester courses?

What is the test statistic?

1 points

QUESTION 8

ACT scores are normally distributed and have a mean of 20.8 and a standard deviation of 4.8. A researcher wants to know students at her college compare to the national average. The researcher randomly samples 36 students at her school. The sample average for the sample was 18. Do the students significantly differ from the general population?

What should the null hypothesis be?

1 points

QUESTION 9

A professor knows his tests generally have an average of 75 with a standard deviation of 10. The professor is now teaching a condensed course in the summer. The summer course is less weeks than his normal classes. The professor is afraid that the summer course is too condensed and negatively affects tests scores. The professor administers his test to his current 64 students in his summer course. The mean of the 64 students is 71. Is there statistically significant evidence to conclude students in his summer class performed worse than students in his regular semester courses?

What should the null hypothesis be?

1 points

QUESTION 10

A normal population has a mean of 25. After receiving a treatment, a sample of scores yields the following data: 20 28 20 20. Research question: Is there evidence for that the scores differ after receiving the treatment? What is the test statistic? Hint: Find the sample mean and sample standard deviation first.

1.5

3.25

-1.5

-3.25

1 points

QUESTION 11

SAT scores are known to have a mean of 1500 and a standard deviation of 250. A researcher is testing out a new SAT prep course. The researcher selects 49 high school students with a variety ofGPAs. The students are given the prep course and then they take the SAT. The average SAT score for the students is 1600 Is there statistical evidence to conclude the prep course was effective? Use an alpha of .10.

What should the null hypothesis be?

1 points

QUESTION 12

The formula (X – ?)/? is used to calculate a:

raw score

mean distribution

standard deviation

z score

1 points

QUESTION 13

A z score tells you how many _____ you are from the _____.

mean deviations; median

standard deviations; mean

standard deviations; median

mean deviations; mean

1 points

QUESTION 14

A z score of –3.0 is _____ a z score of –2.0

lower than

higher than

the same as

more standard than

1 points

QUESTION 15



According to Cohen, a correlation of .6 is?

weak

moderate

strong

1 points

QUESTION 16

If the sample size is 51 and the t-statistic is -2, what is the p-value for a less than research hypothesis?

.034578

.012332

.013874

.025474

1 points

QUESTION 17

For a perfect correlation to occur, what would need to be the next grade value. You may need to create a scatterplot.

Hours Studied

Grade

2

60

6

70

6

70

8

75

10

80

10

80

12

?

1 points

QUESTION 18

Measures of central tendency and variability are calculated to describe the nature of charitable giving each year. These figures are computed for the “average” American citizen. Which of these is a possible value for the variance in dollars given?

A.

$47.26 squared dollars

B.

$38.45 to $47.26

C.

–$47.26

D.

$47.26

1 points

QUESTION 19

As the sample size increases for a sampling distribution (n for each sample) the standard error decreases.

True

False

1 points

QUESTION 20

The population of some scores are normally distributed, and a sample of 10 is taken, would the sampling distribution be normally distributed (according to the Central Limit Theorem)?

yes

no










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