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

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

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

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)

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)

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)

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)

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)

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

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)

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

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

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)

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

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

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)

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)

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)

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

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

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

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

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

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)

Question 31. 31. A z score of zero tells us that the score is at the________of the distribution. (Points : 4)

Question 32. 32. In a unit normal curve, what goes on the x axis? (Points : 4)

 33.

Question :

Which of the following is a measure of variability?

Student Answer:

 Mean

 Range

 Interval

 All of the above

 34.

Question :

The only measure of central tendency that can be found for nominal data is the

Student Answer:

 Mean 

 Median     

 Mode       

 Midrange

 35.

Question :

If the probability of event A is 0.45 and the probability of event B is 0.35 and the probability of A and B occurring together is 0.25, then the probability of A OR B is:

Student Answer:

 0.8            

 1.8           

 0.1575       

 0.55

 36.

Question :

A researcher knows that the average distance commuting students live from campus was previously 8.2 miles. Because of the rising prices of gasoline, the research wants to test the claim that commuting students now live closer to campus. What is the correct alternative hypothesis?

Student Answer:

 The new mean distance is 8.2 miles.

 The new mean distance is less than or equal to 8.2 miles.

 The new mean distance is less than 8.2 miles.

 The new mean distance is greater than or equal to 8.2 miles.