In a study conducted for the effectiveness of drug A on a certain disease, 60 randomly selected patients with this…

A survey was conducted on a random sample of 1,000 Baltimore residents. Residents were asked whether they have health insurance.…

The American Cancer Society wants to estimate the proportion of high school seniors who smokes regularly. In a random sample…

A random sample of 100 light bulbs has a mean lifetime of 3000 hours. Assume that the population standard deviation…

A researcher wishes to estimate, with 99% confidence, the population proportion of adults who are confident with their country's banking…

A trucking firm has a large inventory of spare parts that have been in storage for a long time. It…

Six soil samples taken from a particular region were subjected to chemical analysis to determine the pH of each sample,…

The true proportion of defective memory chips produced by a certain company is p. Suppose a random sample of 400…

How many people should be surveyed if we want to estimate the proportion of students who prefer using the test…

Let p1 and p2 be the respective proportions of women with nutritional anemia in each of two developing countries. If…