Find One Variable Stats

It is  a variable whose values are determined by chance.

• discrete random variable 

• continuous random variable 

• random variable

• none of the above 

Is this a probability distribution?

• No

• Yes

• Discrete
• Continuous

If Gonzalo's score is 87%, the class average is 82%, and the SD is 4, what is Gonzalo's Z-score?

• -1.25

• +1.25

• +1.20

• +1.02

Is this a probability distribution?

• No

• Yes

• Discrete
• Continuous

What is the interquartile range (IQR)?

• 4

• 64

• 60

• 8

The five number summary for a one-variable dataset is {5, 28, 29, 42, 75}. If you wanted to construct a modified boxplot for the dataset (that is, one that would show outliers if there are any), what would be the maximum possible length of the right side “whisker”?

• 21

• 42

• 33

• 14

A slice of pizza from a certain restaurant has an average area of 40 square inches with a standard deviation of  5 square inches.  Assuming the distribution of areas is approximately normal, what proportion of slices will be between 35 and 50 square inches

• 68%

• 34%

• 81.5%

• 95%

High school textbooks don't last forever. The lifespan of all high school statistics textbooks is approximately Normally distributed with a mean of 9 years and a standard deviation of 2.5 years.  What percentage of books last more than 10 years? 

• 11.5%

• 34.5% 

• 65.5%

• 69%