Mitt Romney
Solution
The sample statistic is the sample mean, x\' = 52
The standard error of the mean is s/n
where s is the standard deviation of individual data values = 6 hours.
The multiplier, denoted by t*, is found using the t-table in the book. It\'s a simple table. There
are columns for .90, .95,.98, and .99 confidence.
t* for 90% confidence = 1.645
Thus the formula for a confidence interval for the mean is
x\' ± t* (s/n)
= 52 ± 1.645 (6/36) = 52 ±1.645
= [50.355, 53.645]
Thus to include 90% of values the range should be as above.
Mitt RomneySolutionThe sample statistic is the sample mean, x.pdf
1. Mitt Romney
Solution
The sample statistic is the sample mean, x' = 52
The standard error of the mean is s/n
where s is the standard deviation of individual data values = 6 hours.
The multiplier, denoted by t*, is found using the t-table in the book. It's a simple table. There
are columns for .90, .95,.98, and .99 confidence.
t* for 90% confidence = 1.645
Thus the formula for a confidence interval for the mean is
x' ± t* (s/n)
= 52 ± 1.645 (6/36) = 52 ±1.645
= [50.355, 53.645]
Thus to include 90% of values the range should be as above
![Mitt Romney
Solution
The sample statistic is the sample mean, x' = 52
The standard error of the mean is s/n
where s is the standard deviation of individual data values = 6 hours.
The multiplier, denoted by t*, is found using the t-table in the book. It's a simple table. There
are columns for .90, .95,.98, and .99 confidence.
t* for 90% confidence = 1.645
Thus the formula for a confidence interval for the mean is
x' ± t* (s/n)
= 52 ± 1.645 (6/36) = 52 ±1.645
= [50.355, 53.645]
Thus to include 90% of values the range should be as above](https://image.slidesharecdn.com/mittromneysolutionthesamplestatisticisthesamplemeanx-230325040752-8943be07/85/Mitt-RomneySolutionThe-sample-statistic-is-the-sample-mean-x-pdf-1-320.jpg)
