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jonnycampbell223
02.03.2020 •
Mathematics
Yesterday (old test question) there was a referendum in Italy. The measure would only count if 50% of the voters turned out to vote. The measure passed. But unfortunately for its backers, the turnout was only 49.6%. This percentage is not a sample, because all the ballots were counted. If instead of counting all the ballots, you had to determine the percentage of Yes votes with a sample, how large a sample would you have to take to get the result within 0.2% at 95% confidence? (0.3 points)
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Ответ:
The required sample size is 240,085.
Step-by-step explanation:
The confidence interval for population proportion is:
The margin of error in the interval is:
Given:
MOE = 0.002
*Use the z-table for the critical value.
Compute the sample size as follows:
Thus, the required sample size is 240,085.
Ответ:
$3.50 per card
Step-by-step explanation:
15 = 8 + 2x
x = 7 / 2
x = 3.50