7.28 Fuel efficiency of manual and automatic cars, part 1. each year the US environmental protection agency (EPA) releases fuel economy data on cars manufactured in that year. below are summary statistics on fuel efficacy (in miles/gallon) from random samples of cars with manual and automatic transmissions. 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? assume that conditions for inference are satisfied.  Automatic Mean = 16.12 Automatic SD = 3.58 n = 26   Manual mean = 19.85 manual SD = 4.51 n = 26

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7.28 Fuel efficiency of manual and automatic cars, part 1.

each year the US environmental protection agency (EPA) releases fuel economy data on cars manufactured in that year. below are summary statistics on fuel efficacy (in miles/gallon) from random samples of cars with manual and automatic transmissions. 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? assume that conditions for inference are satisfied. 

Automatic Mean = 16.12

Automatic SD = 3.58

n = 26

 

Manual mean = 19.85

manual SD = 4.51

n = 26

276
CHAPTER 7. INFERENCE FOR NUMERICAL DATA
7.28 Fuel efficiency of manual and automatic cars, Part I. 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.
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? Assume that conditions for inference
are satisfied.?
22
35
City MPG
Manual
Automatic
25 -
Mean
16.12
19.85
SD
3.58
4.51
26
26
15
automatic
manual
City MPG
Transcribed Image Text:276 CHAPTER 7. INFERENCE FOR NUMERICAL DATA 7.28 Fuel efficiency of manual and automatic cars, Part I. 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. 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? Assume that conditions for inference are satisfied.? 22 35 City MPG Manual Automatic 25 - Mean 16.12 19.85 SD 3.58 4.51 26 26 15 automatic manual City MPG
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