# Project #34026 - Statistics

Question 1

A sample of n = 25 scores has a mean of M = 11. If each score in the sample is multiplied by 3, the new mean would be ____.

Select one:

a. 11

b. 3

c. 33

d. 75

Question 2

A researcher is measuring problem-solving times for a sample of n = 20 children. However, one of the children fails to solve the problem so the researcher has an undetermined score. What is the best measure of central tendency for these data?

Select one:

a. the mean

b. the median

c. the mode

d. Central tendency cannot be determined for these data.

Question 3

A set of N = 10 scores has a mean of ì = 50. If 20 points are added to one of the scores, what is the new value for the population mean?

Select one:

a. 50

b. 51

c. 52

d. 70

Question 4

A sample has a mean of M = 86. If one new person is added to the sample, what effect will it have on the sample mean?

Select one:

a. The sample mean will increase.

b. The sample mean will decrease.

c. The sample mean will remain the same.

d. cannot be determined from the information given

Question 5

A sample of n = 5 scores has a mean of M = 12. What is Ó× for this sample?

Select one:

a. 12/5 = 2.40

b. 5/12 = 0.417

c. 5(12) = 60

d. cannot be determined from the information given

Question 6

A sample has a mean of M = 72. If one person with a score of X = 58 is removed from the sample, what effect will it have on the sample mean?

Select one:

a. The sample mean will increase.

b. The sample mean will decrease.

c. The sample mean will remain the same.

d. cannot be determined from the information given

Question 7For the sample shown in the frequency distribution table, the mode is ____.

 X f 5 1 4 5 3 4 2 1 1 1

Select one:

a. 3

b. 3.5

c. 4

d. 5

Question 8

A sample has a mean of M = 40. If 10 points are added to one of the scores, what is the new value for the sample mean?

Select one:

a. still 40

b. 41

c. 50

d. cannot be determined from the information given

Question 9

What is the mean for the following scores? Scores:1, 6, 14

Select one:

a. 3

b. 6

c. 7

d. 10.5

Question 10

A distribution of scores has a mean of ì = 50. One new score is added to the distribution and the new mean is found to be ì = 48. From this result you can conclude that the new score was ____.

Select one:

a. greater than 50

b. less than 50

c. equal to 48

d. cannot answer from the information given

Question 11

Which of the following symbols identifies the population standard deviation?

Select one:

a. s

b. s2

c. ó

d. ó2

Question 12

If sample variance is computed by dividing SS by n, then the average value of the sample variances from all the possible random samples will be ____ the population variance.

Select one:

a. smaller than

b. larger than

c. exactly equal to

d. unrelated to

Question 13

A population of scores has ì = 50 and ó = 10. If every score in the population is multiplied by 2, then the new mean and standard deviation would be ____.

Select one:

a. ì = 50 and ó = 10

b. ì = 100 and ó = 10

c. ì = 50 and ó = 20

d. ì = 100 and ó = 20

Question 14

A population of scores has ì = 50 and ó = 12. If you subtract five points from every score in the population, then the new standard deviation will be ____.

Select one:

a. 7

b. 12

c. 45

d. insufficient information, cannot be determined

Question 15

What value is obtained if you add all the deviation scores for a population, then divide the sum by N?

Select one:

a. the population variance

b. the population standard deviation

c. you always will get zero

d. none of the other choices is correct

Question 16

What are the values for SS and variance for the following sample of n = 4 scores? Sample:1, 1, 0, 4

Select one:

a. SS = 9 and variance = 3

b. SS = 9 and variance = 2.25

c. SS = 18 and variance = 6

d. SS = 18 and variance = 9

Question 17

A population has SS = 30 and ó2 = 6. How many scores are in the population?

Select one:

a. N = 5

b. N = 6

c. N = 180

d. cannot be determined without additional information

Question 18

If sample variance is computed by dividing SS by df = n - 1, then the average value of the sample variances from all the possible random samples will be ____ the population variance.

Select one:

a. smaller than

b. larger than

c. exactly equal to

d. unrelated to

Question 19

On an exam with a mean of ì = 70, you have a score of X = 75. Which of the following values for the standard deviation would give you the highest position within the class?

Select one:

a. s = 1

b. s = 5

c. s = 10

d. cannot determine from the information given

Question 20

A population of scores has ì = 50 and ó = 10. If 5 points are added to every score in the population, then the new mean and standard deviation would be ____.

Select one:

a. ì = 50 and ó = 10

b. ì = 55 and ó = 10

c. ì = 50 and ó = 15

d. ì = 55 and ó = 15

 Subject Mathematics Due By (Pacific Time) 06/24/2014 09:26 pm
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