Cement for building a dam is delivered by truck. The dispatcher ...

[jc611]

Cement for building a dam is delivered by truck. The dispatcher wants to estimate the average driver time required to load, drive to the dam, unload, and drive back to the plant. The time is assumed to be normally distributed. Total time required is recorded for a random sample of 18 with a mean of 543.71 and a standard deviation of 69.83 . Use these data to obtain an 80-percent confidence interval for the average driver time. ___________________ _ to ___________________ _
 Fill in the blank(s) with correct word

Question 2

For a selected month, the average kilowatt hours used for 49 residential customers showed that x is 1160 and s is 1085 . Compute a 98 confidence interval estimate for the true mean. ___________________ _ to ___________________ _
 Fill in the blank(s) with correct word

[CharlieArnold]

Answer to Question 1

521.77; 565.65

Answer to Question 2

786.91; 1533.08

[jc611]

Thank you

[CharlieArnold]

No problemo