In a study of 415,282 cell phone users, it was found that 64 developed cancer of the brain or nervous system. Assuming that cell phones have no effect, there is a 0.000165 probability of a person developing cancer of the brain or nervous system. Wetherefore expect about 69 cases of such cancer in a group of 415,282 people. Estimate the probability of 64 or fewer cases of such cancer in a group of 415,282 people. What do these results suggest about media reports that cell phones cause cancer of thebrain or nervous system?(a) P(xs 64) = (Round to four decimal places as needed.) In a survey of 1225 people, 893 people said they voted in a recent presidential election. Voting records show that 70% of eligible voters actually did vote. Given that 70% of eligible voters actually did vote, (a) find the probability that among 1225 randomlyselected voters, at least 893 actually did vote. (b) What do the results from part (a) suggest?(a) P(X2 893) = (Round to four decimal places as needed.)

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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It is believed that 11% of all Americans are left-handed. A college needs to know how many left-handed desks to place in the big lecture halls being constructed on its campus. In a random sample of 210 students from that college, whether or not a student was left-handed was recorded for each student. The college wants to know if the data provide enough evidence to show that students at this college have a higher percentage of left-handers than the general American population? State the random variable, population parameter, and hypotheses. State the Type I and Type II errors in the context of this problem.
In a study of 349,212 cell phone users, it was found that 26 developed cancer of the brain or nervous system. Assuming that cell phones have no effect, there is a 0.000109 probability of a person developing cancer of the brain or nervous system. We therefore expect about 39 cases of such cancer in a group of 349,212 people. Estimate the probability of 26 or fewer cases of such cancer in a group of 349,212 people. What do these results suggest about media reports that cell phones cause cancer of the brain or nervous system? (a) P(xs 26) = (Round to four decimal places as needed.) (b) What does the result from part (a) suggest about the media reports? O A. The media reports appear to be correct because one would expect that more than 26 cell phone users would develop cancer and the study offers significant evidence to support this. B. The media reports appear to be incorrect because one would expect that more than 39 cell phone users would develop cancer. In fact, the study may offer…
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