Statistics Midterm Review

The histogram below shows the heights of 300 randomly selected high school students. Which of the following is the best description of the shape of the distribution of heights?

• Roughly symmetric and unimodal

• Roughly symmetric and bimodal

• Roughly symmetric and multimodal

• Skewed to the left

Which of the following best describes the shape of the distribution?

• SKEWED LEFT

• SKEWED RIGHT

• UNIFORM

• SYMMETRICAL

The scores on a statistics test had a mean of 81 and a standard deviation of 9. One student was absent on the test day, and his score wasn’t included in the calculation. If his score of 84 was added to the distribution of scores, what would happen to the mean and standard deviation?

• Mean will increase, and standard deviation will increase.

• Mean will increase, and standard deviation will decrease.

• Mean will increase, and standard deviation will stay the same.

• Mean will decrease, and standard deviation will increase.

Which statement correctly describes the shapes of the dot plots for cars and SUVs?

• SUVs: symmetrical

  Cars: skewed left

• Both are skewed left

• Both are symmetrical

• SUVs: skewed right

  Cars: Skewed left

Which value is greater?

• Median

• Mean

• Mode

• All the same

Find the outlier of the data set using outlier rule.

15, 20, 18, 35, 17, 35, 13

• no outlier

• 35

• 13

• 15

What is the shape of the distribution?

• Skewed Left

• Skewed Right

• Symmetric

• Bimodal

Use the 1.5 IQR rule to determine if there are any outliers for the following numbers:
84, 88, 72, 74, 98, 16, 94

• Yes, 16 is an outlier.

• Yes, 33 is an outlier.

• Yes, 98 is an outlier.

• There are no numbers less than 39 or greater than 124, therefore there are no outliers.

Estimate the correlation coefficient.

• r is close to 1

• r is close to -1

• r is close to 0

• r is close to -0.5

• r is close to 0.5

Which best describes the form of this scatterplot?

• linear

• nonlinear

• scattered