Question

1. The mayor is interested in finding a 90% confidence interval for the mean number of pounds of trash per person per week that is generated in the city. The study included 209 residents whose mean number of pounds of trash generated per person per week was 34.5 pounds and the standard deviation was 7.5 pounds. Round answers to 3 decimal places where possible

a.With 90% confidence the population mean number of pounds per person per week is between ___ and ___  pounds.

b. If many groups of 209 randomly selected members are studied, then a different confidence interval would be produced from each group. About ____ percent of these confidence intervals will contain the true population mean number of pounds of trash generated per person per week and about _____ percent will not contain the true population mean number of pounds of trash generated per person per week.

2. You are interested in finding a 95% confidence interval for the average number of days of class that college students miss each year. The data below show the number of missed days for 10 randomly selected college students. Round answers to 3 decimal places where possible.

3

3

2

7

9

3

6

6

5

7

a.With 95% confidence the population mean number of days of class that college students miss is between____  and ____  days.

b.If many groups of 10 randomly selected non-residential college students are surveyed, then a different confidence interval would be produced from each group. About ______ percent of these confidence intervals will contain the true population mean number of missed class days and about _____ percent will not contain the true population mean number of missed class days.

3.If n = 13, x= 39, and s = 2, construct a confidence interval at a 80% confidence level. Assume the data came from a normally distributed population. Give your answers to three decimal places.
____ < μ< ____

4.Assume that a sample is used to estimate a population mean μ. Find the 99% confidence interval for a sample of size 45 with a mean of 51.5 and a standard deviation of 19.4. Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places.

99% C.I. = ___________

The answer should be obtained without any preliminary rounding

Answer 1

as per HomeworkLib policy we need to solve only one question or four sub parts of one question ...i solved two qauestions..so please post the remaining questiones in another post..thank you