Dr Patton is a professor of English. Recently he counted the number of misspelled words in a group of student essay. For his class of 40 students, the mean number of misspelled words was 6.05 and the standard deviation 2.44 per essay. Construct a 95% confidence interval for the mean number of misspelled words in the population of student essays.© BrainMass Inc. brainmass.com June 3, 2020, 8:29 pm ad1c9bdddf
Solution. Given a sample mean xbar=6.05, sample standard deviation s=2.44 and sample size n=40. For a 95% confidence level, z=1.96.
So, a 95% ...
The expert constructs a 95% confidence interval for the mean number of misspelled words in the population.