AP Statistics Chapter 6 Test BFW

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Answer explanation

c. Two feet constitutes 24 inches. Since there is a variability of about 6 standard deviations in a length that encompasses 99.7% of all observations, we would estimate the standard deviation to be 24/ 4 = 6 inches.

• I
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• I, II, and III

• The slope decreased and the r² increased.
• The slope increased and the r² decreased.
• The slope decreased but r² remained the same.
• Both slope and r² remained the same.

What's the appropriate interpretation of the slope of the regression line?

• For every additional 0.61 hours of growth, the culture is predicted to weight 1 more gram.

• For every additional hour of growth, the culture is predicted to weigh 0.61 more grams.

• For every additional hour of growth, the logarithm of the culture's weight in grams is predicted to increase by 0.61.

• At the beginning of the experiment, the logarithm of the culture's weight in grams was approximately 0.61 ounces.

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• B
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• E

• B
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• E

• A
• B
• C
• D

• B
• C
• D
• E

• B
• C
• D
• E