# Month: February 2021

#### 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…

#### Solved (Free): Managers at an automobile manufacturing plant would like to estimate the mean completion time of an assembly line operation

Managers at an automobile manufacturing plant would like to estimate the mean completion time of an assembly line operation. The managers plan to choose a random sample of completion times…

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

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: A retailer wants to estimate the proportion of customers entering their website actually buy something at the website

A retailer wants to estimate the proportion of customers entering their website actually buy something at the website. The company wants to be 95% sure that their margin of error…

#### Solved: A researcher wishes to estimate the percentage of adults who support abolishing the penny

A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 33 percentage…