DSST Statistics 2

Question 1

A dataset has a mean of 50 and a standard deviation of 5. What is the z-score for a value of 60?

Accepted Answer

2.0

Answer

z = (60 - 50) / 5 = 2.0.

Question 2

Which measure of central tendency is most affected by extreme outliers?

Accepted Answer

Mean

Answer

The mean is pulled toward extreme values because it uses all data points arithmetically.

Question 3

In a hypothesis test, a Type II error occurs when you:

Accepted Answer

Fail to reject a false null hypothesis

Answer

A Type II error (beta) is failing to detect a real effect — accepting a false null hypothesis.

Question 4

Which of the following correlation coefficients indicates the strongest linear relationship?

Accepted Answer

r = -0.82

Answer

The strength of a correlation depends on the absolute value; |-0.82| = 0.82 is the largest here.

Question 5

A probability distribution in which every outcome is equally likely is called a:

Accepted Answer

Uniform distribution

Answer

A uniform distribution assigns equal probability to all outcomes.

DSST - DANTES Subject Standardized Tests Practice Test