# confidence interval

#### Solved: A survey of 120 female freshman showed that 18 did not wish to work after marriage. Find the 95% confidence interval

A survey of 120 female freshman showed that 18 did not wish to work after marriage. Find the 95% confidence…

#### Solved (Free): In a study conducted for the effectiveness of drug A on a certain disease, 60 randomly selected patients with this disease were given medication

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

#### Solved (Free): The distribution of systolic and diastolic blood pressure for female diabetes between the ages of 30 and 34 have unknown means

The distribution of systolic and diastolic blood pressure for female diabetes between the ages of 30 and 34 have unknown…

#### Solved (Free): A survey was conducted on a random sample of 1,000 Baltimore residents. Residents were asked whether they have health insurance. 650 individuals surveyed

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

#### Solved (Free): The American Cancer Society wants to estimate the proportion of high school seniors who smokes regularly. In a random sample of

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

#### Solved (Free): A random sample of 100 light bulbs has a mean lifetime of 3000 hours. Assume that the population standard deviation of the lifetime is 500

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

#### Solved (Free): A trucking firm has a large inventory of spare parts that have been in storage for a long time. It knows that some proportion of these spare parts will have deteriorated to the point where they are no longer usable

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

#### Solved (Free): An admissions officer has determined that the population of applicants to the MBA program has undergraduate GPA that are approximately

An admissions officer has determined that the population of applicants to the MBA program has undergraduate GPA' that are approximately…

#### Solved (Free): Six soil samples taken from a particular region were subjected to chemical analysis to determine the pH of each sample

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

#### Solved (Free): The true proportion of defective memory chips produced by a certain company is p. Suppose a random sample of 400 memory chips are tested

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