Psych Stats - Prelim

What is the primary purpose of central tendency?

• To eliminate outliers

• To summarize data by identifying a single representative value

• To analyze the spread of data

• To group data into intervals

Which measure of central tendency is most sensitive to extreme scores?

• Mean

• Median

• Mode

• Range

When is it more appropriate to use the median instead of the mean?

• When there are no repeated values

• When the data set is symmetrical

• When the data contains outliers or is skewed

• When the goal is to find the most frequent value

What does it mean when the mean is higher than the median in a distribution?

• The distribution is symmetrical

• The distribution is positively skewed

• The distribution is negatively skewed

• The data contains multiple modes

What is the weighted mean used for?

• To find the most frequent value in grouped data

• To calculate the mean for data sets with equal weights

• To calculate the overall mean of multiple groups with different sizes

• To divide the data into intervals

What is the total number of scores in the data set?

• 20

• 25

• 30

• 35

What is the mean of the scores?

• 25

• 27

• 30

• 32

A group of 8 participants has the following scores: 2, 4, 4, 6, 6, 6, 8, 10

What is the mean of the scores?

• 5.75

• 6

• 7

• 8

If the highest score is removed in a dataset, what will happen to the mean?

• Increase

• Decrease

• Stay the same

• Cannot be determined

Which measure of central tendency is best for skewed distributions?

• Mean

• Median

• Mode

• All of the above