A chili recipe calls for 6 lb of ground beef for 25 servings how many pounds of ground beef are needed for 30 servings
1 answer:
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Answer:
A sample size of 1380 should be obtained.
Step-by-step explanation:
Minimum sample size:
The minimum sample size is of:
In which z is the critical value, related to the confidence level, E is the desired margin of error, and
are the proportions.
99% confidence level
So , z is the value of Z that has a pvalue of
, so
.
Estimates of 22.6% male and 18.1% female from a previous year
This means that .
Within 3 percentage points, minimum sample size:
This is n for which . So
Rounding up:
A sample size of 1380 should be obtained.