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Statistics QUESTION 1 1. What is the Median of the following data set? 18 25 37 21 25 25 20 25 40 Ans: 2.

Statistics QUESTION 1
1. What is the Median of the following data set?

18

25

37

21

25

25

20

25

40

Ans:

2.

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Statistics QUESTION 1
1. What is the Median of the following data set?

18

25

37

21

25

25

20

25

40

Ans:

2.

3.

a) 22

b) 26

c) 25

d) 24

QUESTION 2
1. What is the Median of the following data set?

100

79

80

59

60

72

47

30

90

95

68

78

72

73

75

2.

3.

Ans : a) 70

b) 73 c) 72. d) 71
QUESTION 3
1. What do you call a variable controlled by the researcher?

2.

a) dependent variable 

b) independent variable

c) extraneous variable 

d) level

QUESTION 4
1. Which of the following words could legitimately fit into this sentence: “That simple frequency distribution has two _________, 13 and 18.”

2.

a) none of the choices are correct

b) means

c) medians

d) modes

QUESTION 5
1. Your textbook recommends that the first step in working a problem should be to

2.

a) copy the data;

b) re-read the problem;

c) build a database;

d) estimate the answer.

QUESTION 6

A program admissions coordinator wanted to know if the math placement test given to a certain cohort of students was an indicator on how well they would perform on their first exam. She records the scores of their placement test and first exam below. Is there a correlation between these measures?

Placement

Exam 1

11

49

48

71

7

75

33

80

28

92

23

96

20

61

27

100

35

71

26

96

1.
QUESTION 7

Data were gathered comparing four recipes for whole wheat bread. (The dependent variable was a scaled judgment by a trained taster.) Ten judgments were made on each recipe. An F = 2.90 was obtained. Which conclusion is proper?

1.

a) reject H0 at the .01 level

b) not enough information is given

c) reject H0 at the .001 level 

d) reject H0 at the .05 level

QUESTION 8

The one way ANOVA is not appropriate if the data come from

1.

a) paired-samples design;

b) both choices are correct

c) neither choice is correct

d) populations that do not have the same mean

QUESTION 9

With an acknowledgment to Sesame Street, “Which of these things is not like the others, which of these things doesn’t belong?”

1.

a) independent samples

b) matched pairs

c) repeated measures

d) natural pairs

QUESTION 10

In an independent samples design, the null hypothesis is that

1.

a) the sample mean of one group is equal to that of a second group

b) the population mean of one group is larger or smaller than that of a second group

c) the population mean of one group is equal to that of a second group

d) sample mean of one group is larger or smaller than that of a second group

QUESTION 11

Which of the following statements describes a positive correlation?

1.

a) Walnut is more dense than pine. 

b) The more I study, the lower my test scores. 

c) The greater the cost, the better the merchandise.

d) None of the choices are correct. 

QUESTION 12

Calculate the Chi-square test statistic for the goodness of fit with the following table: The following data represents scores on a police entrance exam. Level 1 Level 2 Level 3Observed Values, O 29 201 169Expected Values, E 20.5 218.8 159.7

1.

a) 7.516

b) 6.256

c) 9.159

d) 5.514

QUESTION 13
1. In a χ2 test of independence between age and personality type, the null hypothesis was rejected. The proper conclusion is

2.

a) this was the wrong test

b) age and personality are independent of each other

c) age and personality are related to each other

d) age and personality are measured on different scales and cannot be related with statistics

QUESTION 14

In a χ2 test of independence between gender and kinds of phobias, the null hypothesis was rejected. The proper conclusion is that

1.

a) gender and phobias are related to each other

b) none of the choices are correct

c) gender and phobias are independent of each other

d) knowing a person’s phobia gives you no clue to his or her gender

QUESTION 15
1. The way in which the data analyzed with chi square differ from those analyzed with ANOVA is that chi square data are

2.

a) not random samples

b) not normally distributed

c) normally distributed

d) frequency counts

QUESTION 16

Suppose you obtained a Spearman rs of .38 from 26 pairs of scores. For a two-tailed test, such a correlation coefficient should be considered

1.

a) not statistically significant

b) significant at the .01 level

c) significant at the .05 level

d) significant at the .001 level

QUESTION 17

The general form of a null hypothesis for a Spearman correlation is:

1.

a) H0: There is a [monotonic] association between the two variables [in the population].

b) H0: There is no [monotonic] association between the two variables [in the population].

c) H0: There is an equal association between the two variables [in the population].

d) H0: There is not an equal association between the two variables [in the population].

QUESTION 18

Suppose you obtained a Spearman rs of .53 from a sample of 13 pairs of scores. For a two-tailed test, such a correlation coefficient is

1.

a) p < .01

b) p <.001

c) not statistically significant

d) p < .05

QUESTION 19

When contrasted with Pearson's correlation calculation, Spearman's correlation coefficient measures how well the data fits what assumption about the data?

1.

a) That the data has a linear trend

b) That the data is random

c) That the data has an exponential trend

d) That the data has a monotonic trend

QUESTION 20

What is the range of the following data set?

100

79

80

59

60

72

47

30

90

95

68

78

72

73

75

1.

2.

Ans. a) 75

b) 71

c) 72

d) 70

QUESTION 21
1. What is the Mode of the following data set?

18

25

37

21

25

25

20

25

40

2.

3.

Ans. a) 23

b) 25

c) 22

d) 24

QUESTION 22
1. What is the Mean of the following data set?

18

25

37

21

25

25

20

25

40

2.

3.

Ans:
a) 25.22

b) 26

c) 25

d) 26.22

QUESTION 23
1. Five higher education institutions were ranked according to their cost and retention. The data are listed below. Which test would you use to determine if there is a correlation? What are the results (written according to the handbook), and what do they mean?

Cost

Retention

1

2

2

3

3

5

4

1

5

4

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