Chapter 1 - AP Stats Practice Test MC

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T1.1 c. The 2 categorical variables are model of plane and whether or not they arrived on time. The 3 quantitative variables are amount of fuel (continuous), time in flight (continuous), and number of passengers (discrete).

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T1.2 d. Starting the scale at 4 makes it seem like the number of students who like pasta is more than double the number of students who like donuts and pizza combined.

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T1.3 b. The third quartile is the average of the 30th and 31st observations.

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CCSS.6.SP.B.4

CCSS.HSS.ID.A.1

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T1.4 b. There are 52 observations in the frequency histogram so the median is the average of the 26th and 27th observations, both of which fall in the interval from 20 to 25 by counting from the left on the histogram.

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CCSS.6.SP.B.4

CCSS.HSS.ID.A.1

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T1.5 c. The distribution is skewed to the right so the mean is greater than the median. The range is greater than the IQR.

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CCSS.6.SP.B.4

CCSS.HSS.ID.A.1

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T1.6 e. The age of the houses in the sample typically varies about 16 years from the mean age.

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T1.7 c. The mean salary of all workers will be somewhere between the mean salaries of the two groups separately, however where it will be between these two numbers will depend on how many workers are in each individual group.

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CCSS.6.SP.B.5C

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T1.8 e. Among the small companies, 125 of the 200 surveys sent were returned. This is 62.5%.

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CCSS.8.SP.A.4

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T1.9 b. Among the small companies, 62.5% responded. Only 40.5% of the medium and 20% of the large companies responded.

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CCSS.8.SP.A.4

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T1.10 d. Actually, high concentrations appear to have better weed control (fewer weeds growing) than lower concentrations.

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CCSS.7.SP.B.4