Prob Stats Final Review

For the data {10, 15, 20, 25, 30}, which of the following measures not change if the 30 was replaced by a 40?

• The mean

• The median

• The IQR

• The range

Which of the following is not a measure of variation?

• The quartiles

• The IQR

• The standard deviation

• The range

In a normally distributed variable, those values more than 2 standard deviations away from the mean are considered

• discrete

• normal

• outliers

• impossible

The symbol x̄ represents

• the population mean

• the population standard deviation

• the sample mean

• the sample standard deviation

Given the histograms, which is approximately uniform?

• A

• B

• C

• D

The shape of Histogram B would be classified as

• symmetric, unimodal

• symmetric, bimodal

• skewed left

• skewed right

The shape of Histogram D would be classified as

• symmetric, unimodal

• symmetric, bimodal

• skewed left

• skewed right

If you got a 79 on a test in a class with a mean score of 85 and a standard deviation of 4.8, the z-score of your test score would be

• 1.25

• -2.50

• -1.25

• 2.50

Which of the following represents a parameter?

• x̄

• s

• p̂

• µ

In an effort to determine the amount of debt for Champlain College students, I surveyed 100 students from each class (Freshman, sophomore, junior, and senior). What method of sampling did I use?

• simple random sampling

• systematic random sampling

• stratified random sampling

• cluster sampling

• convenience sampling