Question 17

Which of the following statements is true?

• According to the Central Limit Theorem, the mean of the sampling distribution is greater than the population mean.
• According to the Central Limit Theorem, the mean of the sampling distribution is greater than the standard deviation.
• According to the Central Limit Theorem, the mean of the sampling distribution is equal to the population mean as long as the sample size is large enough.
• According to the Central Limit Theorem, the mean of the sampling distribution is equal to the standard deviation.

Question 19

Adam graded ten standardized tests with the followingscores:

48, 65, 72, 86, 84, 52, 93, 97, 81, 80

Which standardized test score represents the 70th percentile?

• 84
• 65
• 86
• 72

Question 20

When a survey was conducted among 100 students to find their favorite pizza topping, 45 students voted for pepperoni, 25 for mushrooms, and 30 voted for cheese.

If a pie chart were made showing the number of votes for each topping, the central angle for the cheese sector would be __________.

• 108
• 90
• 198
• 162

Question 21

Select the statement that correctly describes a normal distribution.

• It is a uniform distribution, as all of the values have equal frequency.
• It is a symmetric distribution, as the mean and the median are the same.
• It is a negatively skewed distribution, as the extreme values are less than the median.
• It is a positively skewed distribution, as the extreme values are greater than the median.

Question 23

A data set has its first and third quartiles as 9 and 17, respectively.

Which of the following data points would be considered an outlier for the data set?

• 27
• 3
• 41
• 17

Question 25

Let x stand for the number of minutes spent waiting in line for a rollercoaster at an amusement park. 81 people are sampled at a time.The sample mean is 18 minutes and the sample standard deviation is 0.5 minutes.

What is the standard deviation of the population?

• 2
• 4.5
• 0.5
• 18