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# Variables in which the values are categories are known as

Question 7. 7. Variables in which the values are categories are known as (Points : 4)

Interval variables
Nominal variables
Ordinal variables
Ratio variables

 Question 8. 8. Before the researcher can conduct a statistical test, the research question must be translated into (Points : 4)

A testable hypothesis

Mathematical symbols

Numbers

 Question 9. 9. The hypothesis stating that there are no differences, effects, or relationships is (Points : 4)

The alternative hypothesis

The baseline hypothesis

The null hypothesis

The reasonable hypothesis

 Question 10. 10. A group of students made the following scores on a 10-item quiz in psychological statistics: {5, 6, 7, 7, 7, 8, 8, 9, 9, 10, 10} What is the mean score? (Points : 4)

6.6

7.2

7.8

8.7

 Question 11. 11. A group of students made the following scores on a 10-item quiz in psychological statistics: {5, 6, 7, 7, 7, 8, 8, 9, 9, 10, 10} What is the median score? (Points : 4)

6
7
8
9

 Question 12. 12. A group of students made the following scores on a 10-item quiz in psychological statistics: {5, 6, 7, 7, 7, 8, 8, 9, 9, 10, 10} What is the mode? (Points : 4)

5
7
8
9

 Question 13. 13. A group of students made the following scores on a 10-item quiz in psychological statistics: {5, 6, 7, 7, 7, 8, 8, 9, 9, 10, 10} What is the range of scores? (Points : 4)

5
6
7
11

 Question 14. 14. A group of students made the following scores on a 10-item quiz in psychological statistics: {5, 6, 7, 7, 7, 8, 8, 9, 9, 10, 10} What is the variance, treating these scores as a sample? (Points : 4)

1.53
1.60

2.33

2.56

 Question 15. 15. The standard normal distribution has all the following properties EXCEPT: (Points : 4)

The mean, mode, and median are all equal

The total area under the curve equals 1

The curve is specified by two parameters, the mean and the standard deviation

The curve extends to + and 3 standard deviations from the mean

 Question 16. 16. According to the Empirical Rule, approximately _______% of the data in a normal distribution will fall within 1 standard deviation of the mean. (Points : 4)

34
68

95

99.7

 Question 17. 17. In statistical computations, the number of values that are free to vary is known as (Points : 4)

Degrees of freedom

Freedom factor

Variability index

Variation quotient

 Question 18. 18. Which of the following reflects a Type I error? (Points : 4)

Rejecting the null hypothesis when in reality the null hypothesis is true

Rejecting the null hypothesis when in reality the null hypothesis is false

Accepting the null hypothesis when in reality the null hypothesis is true

Accepting the null hypothesis when in reality the null hypothesis is false

 Question 19. 19. Which type of sampling is used when the experimenter asks 5 area doctors to refer pregnant women to his study and accepts all women who offer to be in his study? (Points : 4)

purposive sampling

convenience sampling

cluster sampling

stratified sampling

 Question 20. 20. In our statistics equations, n refers to: (Points : 4)

mean

standard deviation

normal distribution

number of subjects

 Question 21. 21. Which of the following is true regarding alpha? (Points : 4)

it is also known as the level of significance
value is set by the researcher

value is equal to the probability of a type I error

all of the above are true

 Question 22. 22. Macy proposes that boys who play sports are viewed as more attractive than boys who do not play sports. What is her null hypothesis? (Points : 4)

Boys who play sports are not viewed as more attractive than boys who do not play sports

Playing sports will influence how attractively boys are viewed

Boys who play sports are more attractive than girls who play sports

There can be no null hypothesis

 Question 23. 23. You calculate a t of 2.38 and note that the tabled value for .01 is 3.22 and for .05 is 2.19. You would conclude that the null hypothesis can be: (Points : 4)

Accepted at the .05 level

Rejected at the .01 level

Rejected at the .05 level

None of the above

 Question 24. 24. A researcher is studying political conservatism among 11 engineering students and 11 humanities students. The number of degrees of freedom for a t test is: (Points : 4)

22

20

11

10

 Question 25. 25. A t test for dependent groups should be used instead of a t test for independent samples: (Points : 4)

If each participant is measured twice
Whenever there are equal numbers of subjects in each group
Whenever there are only two groups
All of the above

 Question 26. 26. In a normal distribution, what percent of the population falls within one and two standard deviations of the mean? (Points : 4)

34%
68%
95%
cannot tell from the information given

 Question 27. 27. Which of the following is more affected by extreme scores? (Points : 4)

Mode

Mean

Median

None of the above are affected

 Question 28. 28. On a histogram, what does the vertical (y) axis refer to? (Points : 4)

Individual scores

Frequencies

Means

Deviation scores

 Question 29. 29. Which statistic refers to the average amount by which the scores in the sample deviate from the mean? (Points : 4)

Range
Standard deviation

Median

Mode

 Question 30. 30. Assume a normal distribution for N = 300. How many cases would one expect to find between +1 and -1 standard deviations around the mean? (Points : 4)

102

285

150

204

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