Review for CA6

Michael’s math quiz scores are shown below.
 88, 87, 95, 72, 78, 80, 83, 80
Which of the following is a stem-and-leaf plot that correctly shows Michael’s math quiz scores?

• Choice A
• Choice B
• Choice C
• Choice D

Researchers recorded the number of times 12 lab rats completed a maze in 30 minutes. The data is recorded below: 
15, 12, 15, 12, 13, 11,
10, 13, 11, 14, 12, 13
Select the dot plot that best represents the data.

• Choice A
• Choice B
• Choice C
• Choice D

Brookside Grocery sponsored a team in the local charity run. The ages of the runners are shown below. 
35, 23, 45, 21, 18, 19,
54, 46, 37, 25, 29, 18, 33
Which box plot best represents the ages of the runners?

• Choice A
• Choice B
• Choice C
• Choice D

A medical research team studied the ages of patients who had strokes caused by stress. The ages of 31 patients who suffered stress strokes are shown in the histogram. What is true about the shape and spread of the distribution of data?

• The shape is uniform, with a spread of 35 years.
• The shape is symmetric, with a spread of 30 years.
• The shape is skewed, with a spread of 35 years.
• The shape is skewed, with a spread of 30 years.

The data shows the time in seconds for 25 runners who competed in the 100-meter dash at a track meet. Their time is rounded and shown below, and in the histogram.
11 11 12 12 12 12 13 13 13 13 14 14 14 14 14 15 15 15 15 16 16 17 17 18 18
Which statement is true about the measures of center?

• The median and mean are equivalent, so the shape of the distribution is symmetric.
• The mean is greater than the median, so the shape of the distribution is skewed.
• The median is greater then the mean, so the shape of the distribution is non-symmetric.
• You cannot determine any information about the shape of the distribution using the measures of center.

Raymond's club soccer team sells raffle tickets for a flat screen television. The dot plot shows the number of tickets each player sold.
Which of the following statements are true?
I. The distribution is skewed.
II. The value of 19 is an outlier.
III. There are two peaks at 8 and 10.
IV. There is a gap from 11 to 18.

• IV only
• II and III only
• I, II, and IV only
• I, II, III, and IV

The Cumberland Knights were one of eight basketball teams that competed in the quarterfinals. Each team's final score is represented below.
50, 70, 71, 72, 73, 72, 62, 72
Which of the following is true about the final scores?
I. The spread of the scores can be described by the value of 23.
II. A median of 72.5 can be used to describe the center.
III. The shape of the data is skewed because the mean and median are not equivalent.
IV. The interquartile range has a value of 6.

• I only
• II and III only
• III and IV only
• I, III, and IV only

Bryan recorded the number of hours he slept last week. The data is shown below.
6.5, 7, 7.5, 6.5, 12, 7, 7.5
Which is a true comparison of the measures of center for Bryan's sleep data?

• Median = Mean
• Mean < Median
• Mean > Median
• Range = Mean

Alex practiced playing the piano each
day last week. The number of minutes
he practiced each day is shown in the
table. How could the data be changed to make the median greater than the mean?

• Alex could practice next time for 45 minutes.
• Alex could practice next time for 25 minutes.
• Alex could practice next time for 35 minutes.
• There is not enough information given to determine this.

An outlier can have the biggest effect on the:

• Mean
• Median
• Mode
• The answer is not here.