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sasho [114]
3 years ago
12

A recent study by allstate insurance co. finds that 82% of teenagers have used cell phones while driving (the wall street journa

l, may 5, 2010). suppose a random sample of 100 teen drivers is taken.
Business
1 answer:
nata0808 [166]3 years ago
6 0
Thank you for posting your question here at brainly. I think below should be the questions and the answer:

a.<span>Discuss the sampling distribution of the sample proportion
</span>N(p)<span>= 82 >5, n(1-p) = 18 >5, it is normal distribution and provokes central limit theorem

</span>b.<span>What is the probability that the sample proportion is less than 0.80?
</span>z=82-80/sqrt(.82(.18)/100) = .52057
<span>z(x<.52057) = 0.6985
</span>
c.What is the probability that the sample proportion is within ± 0.02 of the population <span>proportion?
</span><span>Sd of error = .0384
</span><span>+-.02/.0384 = +- .6351
</span><span>P(z<.6351) – P(z<-.6351)
</span><span>7357-.2643= 0.4714</span>

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