# Question: A simple random sample of 25 observations is derived from

A simple random sample of 25 observations is derived from a normally distributed population with a known standard deviation of 8.2.

a. Is the condition that is normally distributed satisfied? Explain.

b. Compute the margin of error with 80% confidence.

c. Compute the margin of error with 90% confidence.

d. Which of the two margins of error will lead to a wider interval?

a. Is the condition that is normally distributed satisfied? Explain.

b. Compute the margin of error with 80% confidence.

c. Compute the margin of error with 90% confidence.

d. Which of the two margins of error will lead to a wider interval?

## Relevant Questions

Consider a population with a known standard deviation of 26.8. In order to compute an interval estimate for the population mean, a sample of 64 observations is drawn.a. Is the condition that is normally distributed ...A family is relocating from St. Louis, Missouri, to California. Due to an increasing inventory of houses in St. Louis, it is taking longer than before to sell a house. The wife is concerned and wants to know when it is ...Find tα,df from the following information.a. α = 0.025 and df = 12b. α = 0.10 and df = 12c. α = 0.025 and df = 25d. α = 0.10 and df = 25The manager of The Cheesecake Factory in Boston reports that on six randomly selected weekdays, the number of customers served was 120, 130, 100, 205, 185, and 220. She believes that the number of customers served on ...A teacher wants to estimate the mean time (in minutes) students take to go from one classroom to the next. His research assistant uses the sample time of 36 students to report the confidence interval as [8.20, 9.80].a. Find ...Post your question