A test on a random sample of 26 tricornes (i.e., pirate hats) yielded a sample average...
A test on a random sample of 26 tricornes (i.e., pirate hats) yielded a sample average length of 23 inches and a sample standard deviation of 1.5 inches. Assume that tricorne length is normally distributed. How many total samples are needed to construct a 95% confidence interval that differs from the sample mean by at most 0.5 inches?
Homework Answers
| for 95 % CI value of z= | 1.960 |
| standard deviation σ= | 1.50 |
| margin of error E = | 0.5 |
| required sample size n=(zσ/E)2 = | 35.0 |
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