Write the ratio as a unit rate. 286 miles in 5 and one-half hours A. 36 miles per hour B. 52 miles per hour C. 57.2 miles per ho
2 answers:
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Answer:
The sample size to obtain the desired margin of error is 160.
Step-by-step explanation:
The Margin of Error is given as
Rearranging this equation in terms of n gives
Now the Margin of Error is reduced by 2 so the new M_2 is given as M/2 so the value of n_2 is calculated as
As n is given as 40 so the new sample size is given as
So the sample size to obtain the desired margin of error is 160.
