Mathematics, 05.07.2020 14:01 aliyyahlove
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 has spent on food during a year has been approximately $1000. If you want to be 99% sure that you have estimated average family food expenditures within (error) $50, how many families do you need to survey? Round your answer to a whole number
Answers: 1
margin of error desired
the standard deviation for this case
(a)
(b)
. And for this case would be 
, replacing into formula (b) we got:
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