Each year the US Environmental Protection Agency (EPA) releases fuel economy data on cars manufactured in that year. Below are summary statistics on fuel efficiency (in miles/gallon) from random samples of cars with manual and automatic transmissions manufactured in 2012. Do these data provide strong evidence of a difference between the average fuel efficiency of cars with manual and automatic transmissions in terms of their average city mileage? Use a 0.05 significance level. (a) Find the test statistic. n ក 8² 3 Automatic (1) 26 15.41 12.5316 3.54 Manual (2) 26 20.48 19.7136 4.44 degrees of freedom: d.f. = 48 (b) Find the positive critical value. (c) Find the negative critical value.
Each year the US Environmental Protection Agency (EPA) releases fuel economy data on cars manufactured in that year. Below are summary statistics on fuel efficiency (in miles/gallon) from random samples of cars with manual and automatic transmissions manufactured in 2012. Do these data provide strong evidence of a difference between the average fuel efficiency of cars with manual and automatic transmissions in terms of their average city mileage? Use a 0.05 significance level. (a) Find the test statistic. n ក 8² 3 Automatic (1) 26 15.41 12.5316 3.54 Manual (2) 26 20.48 19.7136 4.44 degrees of freedom: d.f. = 48 (b) Find the positive critical value. (c) Find the negative critical value.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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Transcribed Image Text:Each year the US Environmental Protection Agency (EPA) releases fuel economy data on cars
manufactured in that year. Below are summary statistics on fuel efficiency (in miles/gallon) from
random samples of cars with manual and automatic transmissions manufactured in 2012. Do these
data provide strong evidence of a difference between the average fuel efficiency of cars with manual
and automatic transmissions in terms of their average city mileage? Use a 0.05 significance level.
(a) Find the test statistic.
₂2
n
8
Automatic (1) 26 15.41 12.5316 3.54
Manual (2) 26 20.48 19.7136 4.44
degrees of freedom: d.f. = 48
(b) Find the positive critical value.
(c) Find the negative critical value.
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