Question: A simple random sample of size n 12 is
A simple random sample of size n = 12 is drawn from a population that is normally distributed. The sample mean is found to be x̄ = 45, and the sample standard deviation is found to be s = 14. Construct a 90% conﬁdence interval for the population mean. Construct the appropriate conﬁdence interval.
Relevant QuestionsA simple random sample of size n = 17 is drawn from a population that is normally distributed. The sample mean is found to be x̄ = 3.25, and the sample standard deviation is found to be s = 1.17. Construct a 95% conﬁdence ...In a random sample of 100 estate tax returns that was audited by the Internal Revenue Service, it was determined that the mean amount of additional tax owed was $3421 with a standard deviation of $2583.Construct and ...Among all credit cards issued, the proportion of cards that result in default was 0.13 in 2010. A credit analyst with Visa believes this proportion is different today. (a) Determine the null and alternative hypotheses, (b) ...A linear rotary bearing is designed so that the distance between the retaining rings is 0.875 inch. The quality-control manager suspects that the manufacturing process needs to be recalibrated because the mean distance ...According to the American Time Use Survey, adult Americans spent 42.6 minutes per day on phone calls and answering or writing email in 2006. (a) Suppose that we want to judge whether the amount of daily time spent on phone ...
Post your question