Question

U W LUJ LULU U.J7 PII Show Intro/Instructions The mayor is interested in finding a 99% confidence interval for the mean number of pounds of trash per person per week that is generated in the city. The study included 120 residents whose mean number of pounds of trash generated per person per week was 35.2 pounds and the standard deviation was 6.2 pounds. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a distribution b. With 99% confidence the population mean number of pounds per person per week is between pounds. and c. If many groups of 120 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.

Answer 1

The statistical software output for this problem is:

One sample T summary confidence interval: Mean of population 99% confidence interval results: Mean Sample Mean Std. Err. DF L. Limit U. Limit 35.2 0.56597998 119 33.718391 36.681609

From this output:

a) t

b) 99% CI:

33.718 and 36.682

c) First blank = 99

Second blank = 1