We take a sample of 218 men and find they have an average commute time of 32 minutes with a standard deviation of 7 minutes. a.) Construct a 95% confidence interval. b.) Describe the interpretation of the confidence level.

If n = 18, = 46, and s = 16, construct a confidence interval at a 90% confidence level. Assume the data came from a normally distributed population. Give your answers to three decimal places.

A newspaper reported that 90​% of people say that some coffee shops are overpriced. The source of this information was a telephone survey of 200 adults. d. Find and interpret a 95​% confidence interval for the parameter of interest.

If n=13, a(x-bar)=39, and s=16, construct a confidence interval at a 90% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place.

A statistics instructor randomly selected four bags of​ oranges, each bag labeled 10​ pounds, and weighed the bags. They weighed 9.1​, 9.5​, 9.8​, and 9.4pounds.   Assume that the distribution of weights is Normal. Find a​ 95% confidence interval for the mean weight of all bags of oranges. Use technology for your calculations. Answer parts a and b below. a. Choose the correct interpretation of the confidence interval below​ and, if​ necessary, fill in the answer boxes to complete your choice. b. Does the interval capture 10​ pounds? Is there enough evidence to reject the null hypothesis that the population mean weight is 10​ pounds? Explain your answer.

In a survey, 19 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $46 and standard deviation of $4. Construct a confidence interval at a 98% confidence level.   ___________+-_______________

April took a sample of 10 statistics students and found the mean of their scores on an exam to be 71.1 with a sample standard deviation of 11.58. The exam scores were normally distributed.  a. construct a (90% confidence interval for all statistics students mean score on the exam. round to 2 decimal places. write down work to show your thinking and any excel commands used. b. explain the confidence interval in one sentence in the context of this situation.

The County Development Agency does a survey of all the mobile home manufacturers in Clarion County and takes a sample of 25 homes. They find: n= 25 x = $13,550 o = $2,000 Find the 95% confidence interval for the local mobile home prices.

B. Find the confidence intervals for the population mean from the given information. 3. X = 28, 4. X = 50, 5. X = 75, 6..X = 15.3, n=60, = 10, n = 16, n = 58, S = = 4 Confidence Level: 90% %3D s = 4.2 Confidence Level: 95% 0 = 10 Confidence Level: 99% o = 16 Confidence Level: 95% 11.

Provide an appropriate response. 23) Construct a 95% confidence interval for the population mean, u. Assume the population has a normal distribution. A sample of 20 part-time workers had mean annual earnings of $3120 with a standard deviation of $677. Round to the nearest dollar. A) ($2803, $3437) B) ($2657, $2891) C) ($1324, $1567) D) ($2135, $2567) Assume that a sample is used to estimate a population proportion p. Find the margin of error E that correşponds to the given statistics and confidence level, Round the margin of oruonlu