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A random sample of 225 full time students at a large two-year college is taken to...

A random sample of 225 full time students at a large two-year college is taken to estimate the amount they spent on text books this semester. The sampled students spent an average of $200 with a standard deviation of $75. Thus, a 95% confidence interval for the average amount spent by all full time students at that school would be:

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$200 ± $0.33

$200 ± $5

$200 ± $10

$200 ± $75

math   Statistics-And-Probability   
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Answer #1

n=225, ă=200, 8=75 qs al confidence utewal is (ū17.) z (200 I 1.96 x 45 ) 525 2 200 1 10 Answee = $200 + $10

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