14.1Online Exercises

Part 2 of 3

Section 14.1 Exercise 1

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A developer wants to know if the houses in two different neighborhoods were built at roughly the same time. She hires an assistant to collect a random sample of houses from each neighborhood and finds that the summary statistics for the two neighborhoods are as shown. Complete parts a through c below.

Neighborhood 1

Neighborhood 2

n1=30

n2=40

y1=54.5

y2=45.6

s1=7.11

s2=7.26

a) Find the estimated mean agedifference, y1y2, between the two neighborhoods.

The estimated mean age difference between the two neighborhoods is

8.9

8.9 years.

b) Find the standard error of the estimated mean difference.

SEy1y2=

nothing

years

(