AP Stats Unit

The boxplots summarize two data sets, 1 and 2. Which of the following must be true?

• I only

• I and III only

• I and II only

• I, II, and III

• III only

The boxplots above summarize two data sets, A and B.

Which of the following must be true?

 

I. Set A contains more data than Set B.

II. The box of Set A contains more data than the box of Set B.

III. The data in Set A have a larger range than the data in Set B.

• I only

• III only

• I and II only

• II and III only

• I, II, and III

A random sample of 374 United States pennies was collected, and the age of each penny was determined. According to the boxplot below, what is the approximate interquartile range (IQR) of the ages?

• 8

• 10

• 16

• 40

• 50

The histogram below displays the frequencies of waiting times, in minutes, for 175 patients in a dentist's office.<\/p>

Which of the following could be the median of the waiting times, in minutes?<\/p>

• 2.5<\/p>

• 7.25<\/p>

• 12.25<\/p>

• 15<\/p>

• 17.50<\/p>

Data were collected on the amount, in dollars, that individual customers spent on dinner in an Italian restaurant. The quartiles for these data are given in the picture. Which of the following statements must be true for these customers?

• At least half of the customers spent less than or equal to $44.27 and at least half spent greater than or equal to $44.27.

• Seventy-five percent of the customers spent between $36.27 and $58.97.

• Twenty-five percent of the customers spent less than or equal to $58.97 and the remaining 75 percent spent greater than or equal to $58.97.

• The mean amount spent by customers is $44.27.

• A majority of customers spent $44.27.

Mark all that apply.

• the spread of 5th period is greater than 2nd period

• the spread of 2nd period is greater than 5th period

• the center of 5th period is greater than 2nd period

• the center of 2nd period is greater than 5th period

What is the relative frequency of High School?

• 2%

• 50%

• 5%

• 20%

Here are the ages of randomly selected people at a community playground 3, 10, 42, 25, 5, 8, 6, 12, 15, 4, 3, 21 To make a stemplot of this data you would use the stems

• 0 and 1

• 1, 2, and 4

• 0, 1, 2, 3, and 4

• 3, 10, 42, 25, 5, 8, 6, 12, 15, 4, 3, and 21

• none of the above is a correct answer

What is the shape of the distribution?

• Skewed Left

• Skewed Right

• Symmetric

• Bimodal

Why is this frequency distribution incorrect?

• The fourth class width is different from the others

• There is a zero.

• Classes should overlapped.