Question
A car manufacturer advertises that its new ultra-green car obtains on average 100 miles per gallon (mpg). A consumer advocacy group tested a sample of
A car manufacturer advertises that its new ultra-green car obtains on average 100 miles per gallon (mpg). A consumer advocacy group tested a sample of 20 cars. Each car was driven the same distance in similar conditions, and the following results on mpg were recorded.
113, 102, 97, 78, 90, 97, 117, 98, 111, 89, 90, 93, 83, 82, 96, 94, 79, 96, 101, 92
Using Descriptive Statistics of Data Analysis of Excel with a 95% confidence level, the following incomplete output is available:
Mean | 95 |
Standard Deviation | 10.58 |
Sample Variance | 111.87 |
Count | 20 |
Confidence Level (95.0%) | 4.95 |
The 95% confidence interval for the mean mpg of all new ultra-green cars is
A. | 91.12 to 96.01 | |
B. | 90.05 to 99.95 | |
C. | 93.12 to 98.07 | |
D. | 90.91 to 93.11 | |
E. | I do not know |
Step by Step Solution
There are 3 Steps involved in it
Step: 1
Get Instant Access to Expert-Tailored Solutions
See step-by-step solutions with expert insights and AI powered tools for academic success
Step: 2
Step: 3
Ace Your Homework with AI
Get the answers you need in no time with our AI-driven, step-by-step assistance
Get Started