Question

In a study of 358 comma 945 cell phone users, it was found that 66 developed cancer of the brain or nervous system. Assuming that cell phones have no effect, there is a 0.000193 probability of a person developing cancer of the brain or nervous system. We therefore expect about 70 cases of such cancer in a group of 358 comma 945 people. Estimate the probability of 66 or fewer cases of such cancer in a group of 358 comma 945 people. What do these results suggest about media reports that cell phones cause cancer of the brain or nervous system?

Answer #1

In a study of 321 comma 324 cell phone users, it was found that
106 developed cancer of the brain or nervous system. Assuming that
cell phones have no effect, there is a 0.000371 probability of a
person developing cancer of the brain or nervous system. We
therefore expect about 120 cases of such cancer in a group of 321
comma 324 people. Estimate the probability of 106 or fewer cases of
such cancer in a group of 321 comma...

In a study of 389,845 cell phone users, it was found that 172
developed cancer of the brain or nervous system. Assuming that cell
phones have no effect, there is a 0.0004630 probability of a
person developing cancer of the brain or nervous system. We
therefore expect about 181 cases of such cancer in a group of
389,845 people. Estimate the probability of 172 or fewer cases of
such cancer in a group of 389 comma 389,845 people. What do...

In a study of 229 comma 611 cell phone users, it was found that
53 developed cancer of the brain or nervous system. Assuming that
cell phones have no effect, there is a 0.000308 probability of a
person developing cancer of the brain or nervous system. We
therefore expect about 71 cases of such cancer in a group of 229
comma 611 people. Estimate the probability of 53 or fewer cases of
such cancer in a group of 229 comma...

In a study of 452,318 cell phone users, it was found that 71
developed cancer of the brain or nervous system. Assuming that cell
phones have no effect, there is a 0.000208 probability of a person
developing cancer of the brain or nervous system. We therefore
expect about 95 cases of such cancer in a group of 452,318 people.
Estimate the probability of 71 or fewer cases of such cancer in a
group of 452,318 people. What do these results...

In a study of 412 comma 126 cell phone users, it was found that
162 developed cancer of the brain or nervous system. Assuming that
cell phones have no effect, there is a 0.000474 probability of a
person developing cancer of the brain or nervous system. We
therefore expect about 196 cases of such cancer in a group of 412
comma 126 people. Estimate the probability of 162 or fewer cases of
such cancer in a group of 412 comma...

2. In a study of 437 comma 485 cell phone users, it was found
that 54 developed cancer of the brain or nervous system. Assuming
that cell phones have no effect, there is a 0.000168 probability
of a person developing cancer of the brain or nervous system. We
therefore expect about 74 cases of such cancer in a group of 437
comma 485 people. Estimate the probability of 54 or fewer cases of
such cancer in a group of 437...

A study of 420 comma 093 cell phone users found that 137 of them
developed cancer of the brain or nervous system. Prior to this
study of cell phone use, the rate of such cancer was found to be
0.0311% for those not using cell phones. Complete parts (a) and
(b).
a. Use the sample data to construct a 90% confidence interval
estimate of the percentage of cell phone users who develop cancer
of the brain or nervous system.
_%<p<...

A study of 420 comma 042 cell phone users found that 133 of them
developed cancer of the brain or nervous system. Prior to this
study of cell phone use, the rate of such cancer was found to be
0.0313% for those not using cell phones. Complete parts (a) and
(b).
a. Use the sample data to construct a 95% confidence interval
estimate of the percentage of cell phone users who develop cancer
of the brain or nervous system.
%...

A study of 420 comma 061 cell phone users found that 134 of them
developed cancer of the brain or nervous system. Prior to this
study of cell phone use, the rate of such cancer was found to be
0.0327% for those not using cell phones. Complete parts (a) and
(b). a. Use the sample data to construct a 95% confidence interval
estimate of the percentage of cell phone users who develop cancer
of the brain or nervous system. nothing%less...

A study of
420 comma 022420,022
cell phone users found that
133133
of them developed cancer of the brain or nervous system. Prior
to this study of cell phone use, the rate of such cancer was found
to be
0.03270.0327%
for those not using cell phones. Complete parts (a) and
(b).
a. Use the sample data to construct a
9090%
confidence interval estimate of the percentage of cell phone
users who develop cancer of the brain or nervous system.
nothing%less...

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