A manufacturer of small engines concerned with the issue of noise pollution developed a new engine...
A manufacturer of small engines concerned with the issue of noise pollution developed a new engine that would be quieter than the standard model. 15 of the new models were tested for noise level and with 25 of the standard models. The results are given below with noise measured in decibels.
| Sample | Sample Size | Sample Mean | Sample Variance |
| Standard | 25 | 84 | 169 |
| New | 15 | 72 | 100 |
a. Find a 98% confidence interval for the difference in mean decibel levels μse - μne.
b. Do the population means appear to be different at 2% level of significance?
Homework Answers
b ) Yes populations mean appear to be
different at 2% level of significanceAdd Answer to:
A manufacturer of small engines concerned with the issue of
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