Chapter 1.2, Problem 48E

(a)

To determine

To explain:The dot above -3 represents.

Answer to Problem 48E

The difference between highway and city in EPA mileage rating, is -3.

Explanation of Solution

Given:

As per the given graph,

Interpretation:

Since, the dot plot displays the different in EPA mileage rating, in miles per gallon for each of 24 model year 2018 cars.

Therefore, the dot above -3 represents as the outliers a part of that it shows that the difference in EPA mileage rating, is -3.

(b)

To determine

To explain:The graph about fuel economy in the city versus on the highway for these car models.

Answer to Problem 48E

The difference in EPA mileage rating in miles per gallon, is normally distributed.

Explanation of Solution

Given:

As per the given graph,

Interpretation:

Since, the dot plot displays the different in EPA mileage rating, in miles per gallon for each of 24 model year 2018 cars.

The city versus on the highway for these car models, show that the difference in EPA mileage rating in miles per gallon, is normally distributed.