How large a sample of late replacement buyers is needed

Assignment Help Applied Statistics

Reference no: EM13910005

Referring to Exercise 8.12b (page 309), assume that s equals .66. How large a sample of late replacement buyers is needed to make us:

a. 99 percent confident that x, the sample mean number of dealers visited, is within a margin of error of .04 of m, the population mean number of dealers visited?

b. 99.73 percent confident that x is within a margin of error of .05 of m?

2. Referring to Exercise 8.21 (page 317), regard the sample of five trial runs for which s = 19.65 as a preliminary sample. Determine the number of trial runs of the chemical process needed to make us:

a. 95 percent confident that x, the sample mean hourly yield, is within a margin of error of eight pounds of the population mean hourly yield m when catalyst XA-100 is used.

b. 99 percent confident that x is within a margin of error of five pounds of m. DS ChemYield

Text Book: Business Statics in Practice By BOWERMAN.

Reference no: EM13910005

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