A mini-golf course is determining the par score for each of its holes. The dot plot shows the number of strokes required to

place a ball in the ninth hole for a sample of 31 players.

Which measure of center is best to use to determine the

expected number of strokes required for the ninth hole?

Ninth Hole Strokes

The mean is the best choice because the data is nearly

symmetrical.

The median is the best choice because data is clustered.

The mean is the best choice because the data is skewed

to the right.

The median is the best choice because the data is

skewed to the left.

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1 2 3 4 5 6 7 8

Number of Strokes

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9

Farmers know that driving heavy equipment on wet soil compresses the soil and injures future crops. here are data on the "penetrability" of the same type of soil at two levels of compression. penetrability is a measure of how much resistance plant roots will meet when they try to grow through the soil. compressed soil 2.85 2.66 3 2.82 2.76 2.81 2.78 3.08 2.94 2.86 3.08 2.82 2.78 2.98 3.00 2.78 2.96 2.90 3.18 3.16 intermediate soil 3.17 3.37 3.1 3.40 3.38 3.14 3.18 3.26 2.96 3.02 3.54 3.36 3.18 3.12 3.86 2.92 3.46 3.44 3.62 4.26 use the data, omitting the high outlier, to give a 95% confidence interval for the decrease in penetrability of compressed soil relative to intermediate soil. compute degrees of freedom using the conservative method. interval: to