Choose the best answer

1		A point estimate is
			A)	Always an estimate of the population mean.
			B)	Always equal to the population value.
			C)	An estimate of the population parameter.
			D)	None of the above
2		A confidence interval
			A)	Always includes the population parameter.
			B)	Decreases in width as the sample size is increased.
			C)	Cannot include a value of 0.
			D)	None of the above.
3		If we wished to decrease the width of a confidence interval, we would not do which of the following.
			A)	Increase the size of the sample.
			B)	Reduce the size of the population.
			C)	Decrease the level of confidence.
			D)	None of the above.
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 not a characteristic of the t distribution.
			A)	It is a continuous distribution.
			B)	It has a mean of 0.
			C)	It is symmetrical.
			D)	Like z there is only one t distribution.
6		We wish to develop a confidence interval for the population mean. The population follows the normal distribution 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)	p should be less than .05.
			D)	None of the above.
9		The finite population correction factor is used when
			A)	n is more than 30.
			B)	N is more than 1000.
			C)	n 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 with .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.