Explore BrainMass

# Sample size from a survey of food costs per year

Not what you're looking for? Search our solutions OR ask your own Custom question.

This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

You are trying to estimate the average amount a family spends on food during a year. In the past, the standard deviation of the amount a family spends on food during the year has been approximately \$1,500.

a. If you want to be 95% sure that you have estimated average family food expenditures within \$100, how many families do you need to survey?
b. How many do you need to survey if you want to be 99% sure?

Â© BrainMass Inc. brainmass.com March 4, 2021, 10:37 pm ad1c9bdddf
https://brainmass.com/statistics/sample-size-determination/sample-size-survey-food-costs-per-year-346635

#### Solution Preview

Please see the attachments.

You are trying to estimate the average amount a family spends on food during a year. In the past, the standard deviation of the amount a family spends on food during the year has been approximately \$1,500.
a. If you want to be 95% sure that you have estimated average family food expenditures within \$100, ...

#### Solution Summary

The solution provides step by step method for the calculation of sample size. Formula for the calculation and Interpretations of the results are also included.

\$2.49