Question 1

When choosing the sample size for estimating a population proportion p to within E units with confidence  if you take  as the approximation to p, you will always obtain a sample size that is at least as large as required.

Accepted Answer

A) True 
 B)False

Question 2

Find the t-value.
-Find the t-value such that the area in the right tail is 0.05 with 34 degrees of freedom.

Accepted Answer

A)   2.728
B)   -1.691
C)   1.691
D)   1.694E) C) and D)
F) All of the above

Question 3

Suppose a 99% confidence interval for ? turns out to be (1000,2100)  .If this interval was based on a sample of size n=23,explain what assumptions are necessary for this interval to be valid.

Accepted Answer

A)   The sampling distribution of the sample mean must have a normal distribution.
B)   The sampling distribution must be biased with 22 degrees of freedom.
C)   The population of salaries must have an approximate t distribution.
D)   The population must have an approximately normal distribution.E) A) and B)
F) B) and C)

Question 4

A college nurse obtained a random sample of 20 students from the college. Each student was asked if they were taking antidepressants. In the data, a 1 indicates the student is taking antidepressants and a 0 indicates they are not taking antidepressants.  Treat these data as a simple random sample of all students at the college. Explain the algorithm in using the bootstrap method with 1000 resamples to obtain a 99% confidence interval for the proportion of all students at the college who are taking antidepressants.

Accepted Answer

The sample data is treated as the popula...

Exam 9: Estimating the Value of a Parameter Using Confidence Intervals

Correct Answer
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The sample data is treated as the popula...
View Answer

When choosing the sample size for estimating a population proportion p to within E units with confidence if you take as the approximation to p, you will always obtain a sample size that is at least as large as required.

Correct Answer
verified

Find the t-value. -Find the t-value such that the area in the right tail is 0.05 with 34 degrees of freedom.

Correct Answer
verified

Suppose a 99% confidence interval for ? turns out to be (1000,2100) .If this interval was based on a sample of size n=23,explain what assumptions are necessary for this interval to be valid.

Correct Answer
verified

Exam 9: Estimating the Value of a Parameter Using Confidence Intervals

Correct AnswerverifiedThe sample data is treated as the popula...View AnswerShow Answer

When choosing the sample size for estimating a population proportion p to within E units with confidence if you take as the approximation to p, you will always obtain a sample size that is at least as large as required.

Correct AnswerverifiedShow Answer

Find the t-value. -Find the t-value such that the area in the right tail is 0.05 with 34 degrees of freedom.

Correct AnswerverifiedShow Answer

Suppose a 99% confidence interval for ? turns out to be (1000,2100) .If this interval was based on a sample of size n=23,explain what assumptions are necessary for this interval to be valid.

Correct AnswerverifiedShow Answer

Correct Answer
verified
The sample data is treated as the popula...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
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