# Question: Prof Green gave three exams last semester Scores were normally

Prof. Green gave three exams last semester. Scores were normally distributed on each exam. Below are scores for 10 randomly chosen students on each exam.

(a) Find the 95 percent confidence interval for the mean score on each exam.

(b) Do the confidence intervals overlap? What inference might you draw by comparing the three confidence intervals?

(a) Find the 95 percent confidence interval for the mean score on each exam.

(b) Do the confidence intervals overlap? What inference might you draw by comparing the three confidence intervals?

**View Solution:**## Answer to relevant Questions

Calculate the standard error of the sample proportion. a. n = 30, π = .50 b. n = 50, π = .20 c. n = 100, π = .10 d. n = 500, π = .005 In a sample of 500 new websites registered on the Internet, 24 were anonymous (i.e., they shielded their name and contact information). (a) Construct a 95 percent confidence interval for the proportion of all new websites ...Use the following information x-bar = 50, σ = 15, n = 90, N = 1,000--to calculate confidence intervals for assuming the sample is from a normal population: (a) 90 percent confidence; (b) 95 percent confidence; (c) 99 ...Analysis showed that the mean arrival rate for vehicles at a certain Shell station on Friday afternoon last year was 4.5 vehicles per minute. How large a sample would be needed to estimate this year's mean arrival rate with ...Inspection of a random sample of 19 aircraft showed that 15 needed repairs to x a wiring problem that might compromise safety. How large a sample would be needed to estimate the true proportion of jets with the wiring ...Post your question