Question 1

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)  1.694 
A)  2.728 
B)  -1.691 
C)  1.691 
D)  1.694

Question 2

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 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. 
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.

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

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

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.

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.

Data Collection

Organizing and Summarizing Data

Numerically Summarizing Data

Describing the Relation Between Two Variables

Probability

Discrete Probability Distributions

The Normal Probability Distributions

Sampling Distributions

Hypothesis Tests Regarding a Parameter

Inference on Two Samples

Inference on Categorical Data

Comparing Three or More Means

Inference of the Least-Squares Regression Model

Filters

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

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

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.

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.

Data Collection

Organizing and Summarizing Data

Numerically Summarizing Data

Describing the Relation Between Two Variables

Probability

Discrete Probability Distributions

The Normal Probability Distributions

Sampling Distributions

Hypothesis Tests Regarding a Parameter

Inference on Two Samples

Inference on Categorical Data

Comparing Three or More Means

Inference of the Least-Squares Regression Model

Filters