Question

1. In a group where the mean = 72, the Sx= 10.4, and the scores are normally distributed, what percent of the group scores below a score of 80?

Use web calculator:http://davidmlane.com/hyperstat/z_table.html (Links to an external site.)

64%

correct answer not given

78%

34%

2. When group scores are normally distributed with a mean of 75 and the standard deviation of 5, what is the score for the 16th percentile?

70

75

60

80

3. The correlation coefficient that could be used to examine the relationship between a continuous and a dichotomous variable is

the Phi coefficient

Kendall's Tau

Point biserial

the Pearson-product-moment correlation

4. A Pearson-product-moment correlation coefficient

a. tells the direction (e.g., inverse) of the relationship between two linearly related continuous variables

b. is a statistic that ranges only between 0 and 1

c. All of the above are correct answers

d. tells the strength of the relationship between two categorical variables

Answer 1

1)

Answer: 78%

Explanation:

The percent of the group scores below 80 is obtained from the given calculator. The screenshot is shown below,

2)

Answer: 70

Explanation:

To calculate the z score the given percentile, the select value from an are and put Area = 0.16. The screenshot is shown below,

3)

Answer: Point biserial

4)

Answer: a. tells the direction (e.g., inverse) of the relationship between two linearly related continuous variables

Explanation: The Pearson-product-moment correlation coefficient tells the direction and strength of two linearly related continuous variables.

Its values range from -1 to +1