Chapter 9 The Practice of Statistics AP Stats

The commuting time for a student to travel from home to a college campus is normally distributed with a mean of 30 minutes and a standard deviation of 5 minutes. If the student leaves home at 8:25 am, what is the probability that the student will arrive at the college campus later than 9 am?

• 0.16

• 0.32

• 0.50

• 0.84

• 1.00

A bank surveyed all of its 60 employees to determine the proportion who participate in volunteer activities. Which of the following statements is true?

• The bank should not use the data from this survey because this is an observational study.

• The bank can use the results of this survey to prove that working for the bank causes employees to participate in volunteer activities.

• The bank did not select a random sample of employees, so the survey will not provide the bank with useful information.

• The bank would have to use the survey data to construct a confidence interval in order to estimate the proportion of employees who participate in volunteer activities.

• The bank does not need to use an inference procedure to determine the proportion of employees who participate in volunteer activities because the survey was a census of all employees.

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

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The histogram to the left shows the number of minutes needed by 45 students to finish playing a computer game. Which of the following statements is correct?

• The distribution is skewed to the right.

• The distribution is skewed to the left.

• The distribution appears to be normal.

• The distribution appears to be chi-square.

• The distribution appears to be uniform.

Which chi-squared test would be appropriate if we were to be measuring the difference in the proportion of MM colors, assuming that the proportion of all colors are equal?

• Chi-Squared Goodness of Fit

• Chi-Squared Test for Homogeneity

• Chi-Squared Test for Association

• Chi-Squared Test for Independence

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