A sample of size 25 was taken from a very large population. Sample statistics, a and s, were used to find that the 80% confidence interval was (159.046, 166.954). S =

The 85.7% confidence interval estimate for p was (0.14, 0.16). Find ?′ and ME.

If n=30, (x-bar)=45, and s=13, construct a confidence interval at a 95% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place. < u <

A new drug to treat high cholesterol is being tested by pharmaceutical company. The cholesterol levels for 8 patients were recorded before administering the drug and after. The mean difference in total cholesterol levels (after - before) was 15.91 mg/dL with a standard deviation of 15.2714 mg/dL. Create a 95% confidence interval for the true average difference in cholesterol levels by the drug.   Question 9 options:   1)  (-3.1428, 28.6772)   2)  (3.1428, 28.6772)   3)  (3.4593, 28.3607)   4)  (10.5107, 21.3093)   5)  (13.5454, 18.2746)

If n=29, x¯=48, and s=13, 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.

suppose a random sample of 50 basketball players have an average height of 78 inches. Also assume that the population standard deviation is 1.5 inches.  I need to Calculate the 99% 95% 90% 80% and 70% confidence interval.  The thing is my answers using the formula from class isn't giving me the answers my professor posted.

If n=15, ¯xx¯(x-bar)=39, and s=11, construct a confidence interval at a 95% confidence level. Assume the data came from a normally distributed population.Give your answers to one decimal place.

A 90% confidence interval for p is given as (0.26,0.54). How large was the sample used to construct this interval? (Round up to the nearest observation.)

A sample of size 25 was taken from a very large population. Sample statistics, x¯ and s, were used to find that the 95% confidence interval was (138.616, 163.384). x¯= s=

If n = 20, the sample mean = 250, SD = 15, SEM = 3.354, what is the confidence interval (using 95% confidence level). What percent confidence do you have that the population mean is between what two values