Displaying Distributions

The ______________ of a variable tells what values that variable takes and how often it takes them

• data

• distribution

• statistics

• graph

How many students are represented by the histogram?

• Cannot be determined

• 9

• 31

• 35

What is the class width for this frequency table?

• 4

• 5

• 10

• 25

Which of the following is a true statement about stemplots?

• Stemplots are only useful for very large data sets.

• Stemplots are useful for quantitative and qualitative data sets.

• Stemplots show the shape of a distribution.

• Stems should be skipped only if there is no data value for a particular stem.

For which of the following variables would it be most appropriate to construct a histogram?

• Television brand

• Insect species

• Gender

• Eye color

• Phone call length

All students are required to sign up for a club. The graph shows the distribution of participation by grade level. Which of the following statements is incorrect?

• 30% of 6th graders joined the math club.

• The number of 8th graders who joined the chess club is the same as the number of 8th graders who joined the math club.

• The number of 6th graders who joined the drama club is the same as the number of 7th graders who joined the drama club.

• The percent of 8th graders who joined the math club is twice the percent of 7th graders who joined the math club.

• The percent of 6th graders who joined the chess club is the same as the percent of 8th graders who joined the drama club.

A random sample of students was given five minutes to solve as many short puzzles as possible. The results by gender are displayed in the dotplots. Which of the following is FALSE statement?

• 75% of girls finished 4 or more puzzles

• The distribution of female scores is skewed right.

• The distribution of male scores is roughly symmetric.

• Both distributions are unimodal.

• Females performed better on the challenge of solving short puzzles in the five minutes allotted.

Which of the following is NOT true about the graph?

• Potential outlier

• Centered at about 35

• skewed right

• not symmetric

Which of the following is NOT true about the graph?

• symmetric

• bimodal

• centered at about 10

• range of 10

A random sample of grocery shoppers were asked whether or not they support higher speeding fines in town. A reporter concludes that more females than males support higher fines. Is he correct in his reasoning?

• Yes. 62 is greater than 45.

• Yes. More females than males participated in the study.

• No. A higher percentage of males than females supported higher fines.

• No. Fewer males than females participated in the study.