7.8 (a) One wants to determine the average price per gallon of regular unleaded

Question

7.8

(a) One wants to determine the average price per gallon of regular unleaded gas in town A. The prices for the seven gas stations in town A are determined. What is the population for this study? Is a statistical study appropriate?

(b) One wants to determine the average number of parts made per hour for all the hours in April 2016. Ten hours in April 2016 are randomly selected and the number of parts made determined for each of the ten hours. What is the population for this study? Is a statistical study appropriate?

(c) The resulting values in part (b) are below. Draw a stem-and-leaf display for this data. 39, 18, 30, 21, 39, 19, 33, 20, 31, 32

(d) Is the stem-and-leaf display in part (c) mound shaped?

Explanation / Answer

(a)

The population of study is : Price of all regular unleaded gas stations in Town A

Yes, if sample is selected at random and sample size is not too small corresponding to populaiton.

(b)

The populaiton: Number of parts made in each hours of April

yes, becuase sample is taken at random

(c)

Following is the stem and leaf display of the data:

(d)

yes, it is mound shaped. And skewed to left.

Stem and Leaf plot for # 1 stem unit = 10 leaf unit = 1 Frequency Stem Leaf 2 1 8 9 2 2 0 1 6 3 0 1 2 3 9 9 10

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