AP Statistics Review

Which of the following is true of the correlation r?

• It is a resistant measure of association

• It's between -1 and 1 inclusively.

• If r is the correlation between X and Y, then -r is the correlation between Y and X

• Whenever all the data lie on a perfectly straight-line, the correlation will always be equal to +1.0

What shape is a normal distribution curve?

• Half curve

• Round curve

• Bell curve

• Square curve

The stem-and-leaf diagram below gives the distribution of the ages in years of 20 participants at a family reunion. Which of the following statements about the distribution is correct?

• The distribution of ages is skewed left.

• The median age was 45 years old.

• The oldest person in attendance was 98.

• 20% of the attendees are younger than 10 years old.

Of the following dotplots, which represents the set of data that has the greatest standard deviation?

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Gina's doctor told her that the standardized score (z- score) for her systolic blood pressure, as compared to the blood pressure of other women her age, is 1.50. Which of the following is the best interpretation of this standardized score?

• Gina's systolic blood pressure is 150.

• Gina's systolic blood pressure is 1.50 standard deviations above the average systolic blood pressure of women her age.

• Gina's systolic blood pressure is 1.50 above the average systolic blood pressure of women her age.

• Gina's systolic blood pressure is 1.50 times the average systolic blood pressure for women her age.

• Only 1.5% of women Gina's age have a higher systolic blood pressure than she does.

Which of the graphs would have a correlation coefficient of r = 0.69 ?

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The ___________________ measures the percent of the variability in the response variable that is accounted for by the least-squares regression line.

• correlation r

• coefficient of relaxation

You are analyzing a scatter plot that has a negative correlation. What is true of the of the x and y values?

• As x increases, y decreases

• As x increases, y increases

• As x decreases, y decreases

In order to estimate the proportion of students that text while driving, a school administrator selects a simple random sample of students from a list of all students at the school who have parking permits. The students are called to the office, one at a time. The administrator asks each student, “Do you text while driving, even though you are not supposed to?” Based on the survey, the administrator estimates that only 2% of students with parking passes text while driving. What potential bias is present in the design of this survey and what is the likely direction of the bias?

• The sample proportion is likely an underestimate of the population proportion due to response bias.

• The sample proportion is likely an underestimate of the population proportion due to undercoverage.

• The sample proportion is likely an underestimate of the population proportion due to nonresponse.

• The sample proportion is likely an overestimate of the population proportion due to response bias.

• The sample proportion is likely an overestimate of the population proportion due to undercoverage.

Given the following VENN Diagram answer the following.
P( A | B )

• 2

• 2/3

• 3/2

• .8