# Tag: sample size determination

#### Solved (Free): Number skills of young men. Suppose that scores of men aged 21 to 25 years on the quantitative part of the National Assessment of Education Progress

Number skills of young men. Suppose that scores of men aged 21 to 25 years on the quantitative part of the National Assessment of Education Progress (NAEP) test follow a…

#### Solved (Free): Data from the Framingham study allow us to compare the distribution of initial serum cholesterol levels for two population of males

Data from the Framingham study allow us to compare the distribution of initial serum cholesterol levels for two population of males; those who go on to develop coronary artery disease…

#### Solved (Free): A researcher wishes to estimate, with 99% confidence, the population proportion of adults who are confident with their country’s banking

A researcher wishes to estimate, with 99% confidence, the population proportion of adults who are confident with their country's banking system. His estimate must be accurate within 2% of the…

#### Solved (Free): How many people should be surveyed if we want to estimate the proportion of students who prefer using the test center

How many people should be surveyed if we want to estimate the proportion of students who prefer using the test center? Assume we want 90% confidence we are within 5%…

#### Solved (Free): An advertising company wishes to estimate the population mean of the distribution of hours of television watched per household per day

An advertising company wishes to estimate the population mean of the distribution of hours of television watched per household per day. Suppose that the population standard deviation of hours watched…

#### Solved (Free): A production process fills containers by weight. Weights of containers are approximately normally distributed

A production process fills containers by weight. Weights of containers are approximately normally distributed. Historically, the standard deviation of weights is 5.5 ounces. (This standard deviation is therefore known.) A…

#### Solved (Free): The operations manager of a large production plant would like to estimate the average amount of time workers take to assemble a new electronic component

The operations manager of a large production plant would like to estimate the average amount of time workers take to assemble a new electronic component. After observing a number of…

#### Solved (Free): For the proportion of infants subjected to fetal surgery for congenital anomalies, the distribution of gestational ages at birth is approximately normal with unknown

For the proportion of infants subjected to fetal surgery for congenital anomalies, the distribution of gestational ages at birth is approximately normal with unknown mean $\mu$ and standard deviation $\sigma$.…

#### Solved (Free): A car dealer wants to estimate the price its competitors charge for similar cars

A car dealer wants to estimate the price its competitors charge for similar cars. The dealer wants to be 95% sure that the maximum margin of error is no larger…

#### Solved (Free): As a marketing director for a local university, you want to advertise the mean salary of your graduates

As a marketing director for a local university, you want to advertise the mean salary of your graduates. As an ethical marketing person, you want to be 99% sure that…