In a study of 320,354 cell phone users, it was found that 34 developed cancer of the brain or nervous system. Assuming that cell phones have no effect, there is a 0.000142 probability of a person developing cancer of the brain or nervous system. We therefore expect about 46 cases of such cancer in a group of 320,354 people. Estimate the probability of 34 or fewer cases of such cancer in a group of 320,354 people. What do these results suggest about media reports that cell phones cause cancer of the brain or nervous system? (a) P(xs 34)= (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 less than 46 cell phone users would develop cancer and the study offers some evidence to support this. O B. The media reports appear to be incorrect because one would expect that more than 46 cell phone users would develop cancer. In fact, the study may offer some evidence to suggest that cell phone use decreases the probability of developing cancer. O C. The media reports appear to be correct because one would expect that more than 34 cell phone users would develop cancer and the study offers some evidence to support this.

The Chartered Financial Analyst (CFA) institute reported that 51% of its U. S. members indicate that lack of ethical culture within financial firms has contributed the most to the lack of trust in the financial industry.   (Source: Data extracted from Global Market Sentiment Survey 2013,cfa.is/YqVCKB.)   Suppose that you select a sample of 100 CFA members. What is the probability that the sample percentage indicating that lack of ethical culture within financial firms has contributed the most to the lack of trust in the financial industry will be between 50% and 55%? The probability is 90% that the sample percentage will be contained within what symmetrical limits of the population percentage? The probability is 95% that the sample percentage will be contained within what symmetrical limits of the population percentage? Suppose you selected a sample of 400 CFA members. How does this change your answers in (a) through (c)?

What is the probability that more than 7 shoppers from this sample felt that regifting was socially​ acceptable?

The article “Unmarried Couples More Likely to Be Interracial” (San Luis Obispo Tribune, March 13, 2002) reported that 7% of married couples in the United States are mixed racially or ethnically. Consider the population consisting of all married couples in the United States. When the n = 200, what is the probability that the proportion of couples in the sample who are racially or ethinically mixed will be greated than .10?

A professional tennis player claims to get 90% of her second serves in. In a recent match, the player missed 5 of her first 20 second serves. Is this a surprising result if the player's claim is true? Assume that the player has a 0.10 probability of missing each second serve. We want to carry out a simulation to estimate the probability that she would miss 5 or more of her first 20 second serves. The dotplot displays the number of second serves missed by the player out of the first 20 second serves in 100 simulated matches. ▪………………………. ●●●●●●●●●●●●●● A●●●●●●●● …………….. 1 2 3 4 5 6 Number of missed serves in simulated match 7 Is there convincing evidence that the player misses more than 10% of her second serves? Why or why not? No, there is not convincing evidence that the player misses more than 10% of her second serves. Missing 5 out of 20 is better than expected. No, there is not convincing evidence that the player misses more than 10% of her second serves. Assuming the player makes…

Physicians at a clinic gave what they thought were drugs to 890890 asthma, ulcer, and herpes patients. Although the doctors later learned that the drugs were really placebos, 5555 % of the patients reported an improved condition. Assume that if the placebo is ineffective, the probability of a patients condition improving is 0.530.53. For the hypotheses that the proportion of improving is 0.530.53 against that it is >0.53>0.53, find the p-value. ?=p=

9) According to the American Academy of Ophthalmology, there is a 18% chance that someone will have hazel eyes. What is the probability that it will take at least seven people to find someone with hazel eyes?

If a researcher wanted to know the probability than an individuals's systolic blood pressure would fall above 95 and found that the corresponding z-score is -1.5, what is the probability that a random individuals' systolic blood pressure would fall above 95?