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7.1
Exercise 7.2

1.

The cure rate for a the standard treatment of a disease is 45%. Dr. Snyder
has perfected a primitive treatment which he claims is much better. As
evidence, he says that he has used his new treatment on 50 patients with
the disease and cured 25 of them. What do you think? Is this new treatment
better. Use a 95% confidence interval to answer the question. (Ans.: (.36,.64)).

2.

Experimenters injected a growth hormone gene into thousands of carp eggs.
Of the 400 carp that grew from these eggs, 20 incorporated the gene into
their DNA (Science News, May 20, 1989). Calculate a 95% confidence
interval for the proportion of carp that would incorporate the gene into
their DNA. From Statistics, S. Rasmussen, CA: Brooks/Cole, 1992. (Ans.:
(.03,.07)).

3.

Using Carrie's baseball data, estimate the proportion of professional baseball
players who weigh 200 or more pounds. Find a 95% confidence interval for
this proportion and interpret it. Recall Carrie's baseball card data set,
Click here to see it . (Ans: 21 out
of 59 weigh 200 or more pounds. So the CI is: (.23, .48)).
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