AP EXAM REVIEW -1

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

• A
• B
• C
• D

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 result of this survey to proved 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 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.

The histogram above displays the frequencies of waiting times, in minutes, for 175 patients in a dentist's office.  Which of the following could be the median of the waiting times, in minutes?

• 2.50
• 7.25
• 12.25
• 15.00

A study of existing records of 27,000 automobile accidents involving children in Michigan found that about 10% of children who were wearing a seatbelt (group SB) were injured and that about 15% of children who weren't wearing a seatbelt (group NSB) were injured. Which of the following statements should NOT be included in a summary report about this study?

• Driver behavior may be a potential confounding factor.

• The child's location in the car may be a potential confounding factor.

• This study was not an experiment, and cause-and-effect inferences aren't warranted.

• This study demonstrates clearly that seat belts save children from injury.

• Concluding that seatbelts save children from injury is risky, at least until the study is independently replicated.

The hitogram above 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 distributions appears to be normal.
• The distribution appears to be uniform.

The histogram above displays the frequencies of waiting times, in minutes, for 175 patients in a dentist's office.  Which of the following could be the median of the waiting times, in minutes?

• 2.50
• 7.25
• 12.25
• 15.00

Which of the following is NOT an assumption of the Binomial distribution?

• All trials must be independent.
• Each trial must be classified as a success or a failure.
• All trials are dependent on each other.
• The number of successes in the trials is counted.

Tags

CCSS.HSS.CP.A.2

CCSS.HSS.CP.A.3

Which of the following is false about binomial probabilities?

• Their distributions are approximately symmetric.
• Trials must be fixed.
• Events musts be independent.
• The probability of success must be 0.50

Tags

CCSS.HSS.CP.A.2

CCSS.HSS.CP.A.3

Is the distribution below a probability distribution? Why or why not?

• Yes. All P(x) values are between 0 and 1, and ∑P(x) = 1
• No, not all P(x) values are between 0 and 1.
• No, ∑P(x) ≠ 1.

Tags

CCSS.HSS.MD.A.1

CCSS.HSS.MD.A.3

CCSS.HSS.MD.A.4

The American Red Cross says that about 11% of the U.S. population has Type B blood. A blood drive is being held at your school. What is the probability that at least 2 of the first 10 blood donors has Type B blood? 

• 0.088
• 0.697
• 0.214
• 0.303 

Tags

CCSS.HSF-LE.A.1C