Module 3 Quiz

Question 1

Which level of measurement is required to calculate a meaningful mean?

Answer 1

At least interval? if not ratio?

Question 2

Which measure of central tendency is most appropriate for nominal data?

Answer 2

Mode

Question 3

When should the median be preferred over the mean?

Answer 3

When the distribution is strongly skewed

Question 4

In a dataset with an even number of values, the median is:

Answer 4

The average of the two middle values

Question 5

A researcher wants to report the typical household income in a neighborhood. Given that income distributions are usually skewed right, which measure should they use?

Answer 5

Median

Question 6

The interquartile range (IQR) represents:

Answer 6

The middle 50% of scores

Question 7

Why is standard deviation preferred over variance for describing spread?

Answer 7

It’s expressed in the original units of measurement

Question 8

The sum of deviation scores from the mean will always equal:

Answer 8

Zero

Question 9

A larger sample size typically results in:

Answer 9

? range being affected?

Question 10

A dataset has a mean of 50 and a standard deviation of 10. According to the Empirical Rule, approximately what percentage of scores falls between 30 and 70?

Answer 10

95%

Question 11

In a positively skewed distribution:

Answer 11

Mode < Median < Mean

Question 12

When a distribution is perfectly symmetrical:

Answer 12

The mean equals the median

Question 13

What happens to the mean when an extreme outlier is added to a dataset?

Answer 13

It moves toward the outlier

Question 14

Which factor does NOT affect variability?

Answer 14

The order of scores
(Factors that affect are Sample Size, Sampling Stability, & Extreme Scores)

Question 15

What is the relationship between variance and standard deviation?

Answer 15

Standard deviation is the square root of variance