1. Complete Problems 26 and 29 at the end of Chapter 6 on pages 242-243 of your textbook. Interpret the results of each interval in context.
2. A survey of 50 young professionals found that they spent an average of $19.31 when dining out with a sample standard deviation of $12.11. Construct a 95% interval estimate of the population mean (sigma is unknown). Can you conclude, at 95% confidence, that the population mean is greater than $18? Why or why not?
3. A survey of 240 individuals found that 1/3 of them use their cell phones primarily for e-mail. Construct a 95% interval estimate of the population proportion. Can you conclude, at 95% confidence, that the population proportion is less than 0.4?
Students succeed in their courses by connecting and communicating with an expert until they receive help on their questions
Consult our trusted tutors.