Chapter 13.1, Problem 17E

a.

To determine

The information about the price of gasoline less than $\$2.80$ .

Answer to Problem 17E

Nine cities.

Explanation of Solution

Given information:

The line plot shows a sample of prices per gallon of unleaded regular gasoline from $25$ different cities.

  $(a)$ In how many cities was the price of gasoline less than $\$2.80$ ?

Calculation:

Descriptive statistics involves organizing, summarizing, and displaying data.

From the line plot, there are nine cities where the price of gasoline is less than $\$2.80$ .

  

Thus, there are nine cities where the price of gasoline is less than $\$2.80$ .

b.

To determine

The representation of conclusion from the study by using inferential statistics.

Answer to Problem 17E

Range $=\$0.19$ .

Explanation of Solution

Given information:

The line plot shows a sample of prices per gallon of unleaded regular gasoline from $25$ different cities.

  $(b)$ What is the range of prices?

  

Calculation:

The range is the difference of the largest and the smallest data so:

Range $=\$2.899-\$2.709$

Range $=\$0.19$

Thus, the range of prices is equal to the $\$0.19$ .