a. What is the appropriate distribution to use to construct a confidence interval based on this research? Student's t b. Use Lian's findings to construct a 99% confidence interval for the appropriate population parameter. If necessary, round results to 1 decimal places. < An < years

Salaries of 40 college graduates who took a statistics course in college have a​ mean, x overbar, of $64,200. Assuming a standard​ deviation, σ​, of ​$12,042​, construct a 95​% confidence interval for estimating the population mean μ.

SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300. An administrator at a college is interested in estimating the average SAT score of first-year students. If the administrator would like to limit the margin of error of the 96% confidence interval to 5 points, how many students should the administrator sample? Make sure to give a whole number answer.

Salaries of 46 college graduates who took a statistics course in college have a​ mean, x​, of $61,400. Assuming a standard​ deviation, σ​, of ​$19,045 , construct a 90​% confidence interval for estimating the population mean.

You want to find out the average monthly rent for a studio apartment in Los Angeles. Out of a sample of n = 100 you find the sample average rent to be ?̅ = $1275. Assume you know the population standard deviation for studios’ monthly rent to be σ = $180. Develop a 90% confidence interval estimate of the population average monthly rent for studio apartments in Los Angeles

Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week. A sample of 85 weekly reports showed a sample mean of  17.5 customer contacts per week. The sample standard deviation was 5.4 . Provide  90 % and  95 % confidence intervals for the population mean number of weekly customer contacts for the sales personnel. 90% confidence interval, to 2 decimals: ( ,  ) 95% confidence interval, to 2 decimals: ( , )

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 212 residents whose mean number of pounds of trash generated per person per week was 37.9 pounds and the standard deviation was 7.7 pounds. Round answers to 3 decimal places where possible. b. With 90% confidence the population mean number of pounds per person per week is between _______ and  ________ pounds. c. If many groups of 212 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.

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 164 residents whose mean number of pounds of trash generated per person per week was 35.5 pounds and the standard deviation was 8.6 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. c. If many groups of 164 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.

An SRS of 350 high school seniors gained an average of ?⎯⎯⎯=45points in their second attempt at the SAT Mathematics exam. Assume that the change in score has a Normal distribution with standard deviation ?=26.deviation      Find a 90% confidence interval for ?� based on this sample. Give your answers to three decimal places. What is the lower bound?     What is the upper bound ?

The mean length of 25 newly hatched iguanas is 7.47 inches with a standard deviation of 0.77 inches. Assume that the lengths of all newly hatched iguanas are normally distributed.   Step 2 of 2 :   Construct a 98% confidence interval for the mean length of all newly hatched iguanas. Round your answer to two decimal places.With 98% confidence, we can say that the mean length of newly hatched iguanas is between _____________________.