Kiln-dried solid grade A teak wood should have a moisture content of no

more than 12%. A furniture company recently purchased a large shipment of this wood to

construct dining room sets. Thirty-seven pieces of teak wood were randomly selected and

carefully measured for moisture content. The sample mean moisture content was 12.3%.

Assume the population standard deviation is 1.25%.

a. Is there any evidence to suggest that the true population mean moisture content is

greater than 12%? use = 0:05.

b. Find the probability of a Type II error if the true population mean moisture content

is 12.1%.