In: Math
(Answers are given but could you please work through the problem and show me the steps?)
Chapter 8
A local health center noted that in a sample of 400 patients, 80
were referred to them by the local hospital.
a. |
Provide a 95% confidence interval for all the patients who are referred to the health center by the hospital. |
b. |
What sample size would be required to estimate the proportion of all hospital referrals to the health center with a margin of error of .04 or less at 95% confidence? |
ANSWER: |
|
A simple random sample of 36 items resulted in a sample mean of 40 and a standard deviation of 12. Construct a 95% confidence interval for the population mean.
ANSWER: |
35.94 to 44.06 |
Six hundred consumers belonging to the 25-34 age group were
randomly selected in a city and were asked whether they would like
to purchase a domestic or a foreign automobile. Their responses are
given below.
Preference |
Frequency |
Domestic |
240 |
Foreign |
360 |
Develop a 95% confidence interval for the proportion of all such consumers who prefer to purchase domestic automobiles.
ANSWER: |
.3608 to .4392 |