Stat Final

Which measure of center best represents this set of data?
12, 13, 11, 16, 31, 14, 10, 15

• Mean

• median

• mode

What percentage of the data is between 90 and 140?

• 25 %

• 50%

• 75%

• 100%

What is the interquartile range (IQR)?

• 4

• 64

• 60

• 8

What is the probability that a student does not play on a sports team? 

• .5

• .45

• .55

Which confidence would result in a wider interval (assuming nothing else changed), 91% or 97%?

• 97%, z* is larger for higher confidence intervals

• 97%, the standard error is larger for higher confidence intervals

• 91%, z* is larger for lower confidence intervals

• 91%, the standard error is smaller for lower confidence intervals

Describe the correlation in the graph shown.

• Strong Negative

• Strong Positive

• Weak Negative

• Weak Positive

Estimate the correlation coefficient for this scatterplot.

• r = 1.2

• r = 0.89

• r = 0

• r = -0.89

What is the point estimate, p̂, of this sample?

• 0.28

• 0.14

• 0.342

• 0.684

Which group has a larger interquartile range?

• Group A

• Group B

• They're the same

The box-and-whisker plot displays the number of inches of snowfall last year for 14 cities. Each city had a different amount of snowfall.

What is the median amount of snow that fell?

• 80 inches

• 64 inches

• 56 inches

• 76 inches