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1
A point estimate is
A)A range of possible values of a population parameter.
B)Always equal to a population value.
C)A single statistic that estimates a population parameter.
D)The population mean.
2
A confidence interval
A)Always includes the population parameter.
B)Increases in width as the sample size is increased.
C)Cannot include a value of 0.
D)Includes a level of confidence.
3
If we wish to decrease the width (increase the precision) of a confidence interval, we would
A)Increase the size of the sample.
B)Reduce the size of the population.
C)Decrease the level of confidence.
D)Compute the mean.
4
We wish to develop a confidence interval for the population mean. The shape of the population is not known, but we have a sample of 40 observations. We decide to use the 92 percent level of confidence. The appropriate value of z is:
A)1.96
B)1.65
C)2.58
D)1.75
5
Which of the following statements is a characteristic of the t distribution?
A)It is a continuous distribution.
B)It has a mean of 0.
C)It is symmetrical.
D)All of the above.
6
We wish to develop a confidence interval for the population mean. The population follows the normal distribution, the standard deviation of the population is 3, and we have a sample of 10 observations. We decide to use the 90 percent level of confidence. The appropriate value of to represent the level of confidence is
A)z =1.65
B)z = 1.96
C)t = 1.833
D)t = 1.812
E)t = 2.262
7
The fraction or ratio of a sample possessing a certain trait is called a
A)Population.
B)Mean.
C)Confidence interval.
D)Proportion.
8
To develop a confidence interval for a proportion
A)We need to meet the binomial conditions
B)The sample should be at least 100.
C)π should be less than .05.
D)We use the t statistic.
9
The finite population correction factor is used when
A)n is more than 30.
B)N is more than 1000.
C)nπ is greater than 5.
D)n/N is more than .05.
10
We wish to estimate the population proportion. We want to be 95 percent confident of our results and we want the estimate to be within .01 of the population parameter. No estimate of the population proportion is available. What value should we use for p?
A)1.96
B).01
C).50
D)We cannot complete the problem, we need more information.





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