Determine the minimum required sample size if you want to be 95% confident that the sample mean is within 21 units of the population mean given o = 97.9. Assume the population is normally distributed.
What is the critical value that corresponds to a level of confidence of 9595?
Round your answer to two decimals.
What is the minimum sample size required for this problem?
Round your answer up to the next integer

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i