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A study of 74 patients with ulcers was conducted in which they were prescribed 40 mg of Pepcid TM. After 8 weeks, 58 reported ulcers healing.
Obtain a point estimate for the proportion of patients with ulcers receiving Pepcid who will report ulcer healing.
Verify that the requirements for constructing a confidence interval about are satisfied.
Construct a 99% confidence interval for the proportion of patients with ulcers receiving Pepcid who will report ulcer healing.
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A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, , is 50 and the sample standard deviation, s, is 8. Construct a 98% confidence interval about m if the sample size, n, is 20.
A simple random sample of size n is drawn from a population whose population standard deviation, s, is known to be 3.8. The sample mean, , is determined to be 59.2.
Compute the 90% confidence interval about ¼ if the sample size, n, is 45.
Compute the 90% confidence interval about ¼ if the sample size, n, is 55. How does increasing the sample size affect the margin of error, E? Let ¼ = 64, Æ = 18 , n = 36
Find ¼
Find Æ
Describe the sampling distribution of . The size of the population is 25,000. n = 300 and p = 0.7
Determine the critical value Z±/2 that corresponds to 94% level of confidence.

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