Chapter 9 Test Review

Antwan wants to know how often the residents in his neighborhood go to the beach. He asks three random households from each street in his neighborhood. Is the sample method valid? Explain.

• Yes, because it includes every street.

• No, because the sample size is too small.

• Yes, because it is a simple random sample.

• No, because it only includes three households per street.

Seventeen out of 20 teens said they eat breakfast every morning. What is a reasonable prediction for the number of teens out of 1,280 who eat breakfast every morning?

• 1,088

• 1,024

• 1,200

• 1,100

For the heights of seventh graders arranged by intervals, which display would be appropriate?

• Line graph

• Histogram

• Pie chart

• Scatter plot

For the closing price of a stock over the past 3 weeks, which display would be appropriate?

• Bar graph

• Line graph

• Pie chart

• Histogram

The data set represents the prices for a full tank of gasoline for different motorcycles:

$19, $18, $15, $17, $19, $12, $19, and $15.

Which measure of center would you use to convince people that the prices are high?

• Mean

• Median

• Mode

• Range

The bar graph shows the heights that students were able to clear on the pole vault. Why might the graph be misleading?

• The scale is not consistent.

• The bars are not labeled.

• The graph does not start at zero.

• The intervals make it appear that the heights are the same.

A survey showed that 70% of students would select roller coasters as their favorite ride at an amusement park. Out of 5,000 students, predict how many would select roller coasters as their favorite ride.

• 3,500

• 2,500

• 4,000

• 1,500

A pet store owner wants to know what type of pet food her customers prefer. Of the 94 responses, she found that 9 prefer organic pet food. She concludes that about 10% of her customers would prefer to feed organic food to their pets. Is this conclusion valid?

• Yes, because 9 out of 94 is approximately 10%

• No, because it is based on a biased voluntary response sample.

• Yes, because it is based on facts.

• No, because 9 out of 94 is exactly 5%

The dot plot shows the test scores of students. What fraction of total students scored 60? Express in simplest form.

• 1/10

• 1/5

• 1/4

• 2/7

Which class had a greater range of scores?

• Room 300

• Room 240

• Both have the same range

• Cannot be determined