A Single Population Mean using the Student t Distribution · Exercise 33
In a recent sample of 84 used car sales costs, the sample mean was $6,425 with a standard deviation of $3,156. Assume the underlying distribution is approximately normal.
(a) Which distribution should you use for this problem? Explain your choice.
(b) Define the random variable in words.
(c) Construct a 95% confidence interval for the population mean cost of a used car.
(a) State the confidence interval.
(b) Sketch the graph.
(c) Calculate the error bound.
(d) Explain what a “95% confidence interval” means for this study.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Introductory Statistics 2e · §8.2 A Single Population Mean using the Student t Distribution · Exercise 33
No hints for this one.
Check your full solution
Attach photos of your pages (up to 3) or one PDF — or check what you typed above. Lemma reads the work and verifies the reasoning, not just the answer.
Your first check today doesn't need an account.
Your photos and PDFs are read once and not stored — only the transcription is kept.