Ou 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 has spent on food during a year has been σ = $1200. If you want to be 99% sure that you have estimated average family food expenditures within $60, how many families do you need to survey? Place your answer, a whole number, do not use any decimals, in the blank___.

The answer is "2653".

Step-by-step explanation:

Minimum sample size for Cl level and Desired Margin of Error, is:  

The minimum n has to be integer, we take the ceiling Of above number and get n = 2663

The exact z-value.

using critical value of 2,575, which gives 2652.25  

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.