statistics assignment

Chapter 8, Section 8.3, Problem 21

An entomologist sprayed 120 adult Melon flies with a specific low concentration of malathion and observed their survival times. The mean and standard deviation were found to be 18.3 and 5.1 days, respectively. Use these data to construct a 99% confidence interval for the true mean survival time. Round endpoints to one decimal place. Confidence interval =  [removed], [removed]  days

Chapter 9, Section 9.1, Problem 01a

Using the table for the t distributions, find the upper 0.25 point when d.f. = 10. Round your answer to 3 decimal places.

The upper 0.25 point when d.f. = 10 is [removed].

Chapter 9, Section 9.1, Problem 01c

Using the table for the t distributions, find:

The lower 0.005 point when d.f. = 20. [removed]

Round your answer to 3 decimal places.

Chapter 9, Section 9.2, Problem 10

Recorded here are the germination times (number of days) for seven seeds of a new strain of snap bean.

12 16 15 49 17 11 18

Determine a 95% confidence interval for the true mean germination time for this strain. Assume that measurements are normally distributed.

Round to two decimal places.

([removed], [removed]) days

Chapter 9, Section 9.2, Problem 14

The monthly rent (dollars) for a two-bedroom apartment on the west side of town was recorded for a sample of ten apartments.

950 745 875 820 1030 920 840 1085 650 895

Obtain a 95% confidence interval for the mean monthly rent for two-bedroom apartments. Assume that measurements are normally distributed.

Round to two decimal places.

([removed], [removed])