Probability and Statistics Concepts Test

Which of the following are categorical variables? Check ALL that apply

• Gender

• GPA

• Height

• Ethnicity

What type of display is this?

• Histogram

• Scatter plot

• Box-and-whiskers

• Bar graph

According to the contingency table, what percentage of dogs are male?

• 42.0%

• 52.0%

• 80.8%

• 82.4%

In a 5-number summary, Q1 is the same thing as _______.

• the median

• the maximum

• the 75th percentile

• the 25th percentile

According to the box-and-whisker plot, the maximum weight in the data set is about __________.

• 84 lbs.

• 98 lbs.

• 105 lbs.

• 110 lbs.

Compare the mean and the median of the pictured distribution.

• The mean is greater than the median.

• The mean is less than the median

• The mean is about the same as the median.

• Not enough information given to compare.

Which of the statistics listed below is a measure of the spread of data? (Select all that apply.)

• median

• IQR

• range

• standard deviation

A Normal model is most appropriate for a data distribution that is _______________?

• unimodal and symmetric

• uniform

• skewed

• bimodal

According to the pictured Normal model, 95% of pizzas are delivered ____________.

• in less than 30 minutes

• in less than 25 minutes

• between 25 and 35 minutes

• between 20 and 40 minutes

The correlation coefficient (r) of this scatterplot is _________.

• less than -1

• equal to -1

• between 0 and -1

• between 0 and +1