This

**preview**has**blurred**sections. Sign up to view the full version! View Full Document1. From a population with a variance of 900, a sample of 225 items is selected. At
95% confidence, the margin of error is
a. 2
b. 15
>>c. 3.92
d. 4
2. In order to determine an interval for the mean of a population with unknown
standard deviation a sample of 61 items is selected. The mean
of the sample is determined to be 23. The number of degrees of freedom for reading
the t value is
a. 22
b. 61
c. 23
>>d. 60
3. If we want to provide a 95% confidence interval for the mean of a population,
the confidence coefficient is
a. 0.485
b. 1.96
>>c. 0.95
d. 1.645
4. As the number of degrees of freedom for a t distribution increases, the
difference between the t distribution and the standard normal
distribution
a. stays the same
b. becomes larger
>>c. becomes smaller
d. None of these alternatives is correct.
5. The value added and subtracted from a point estimate in order to develop an
interval estimate of the population parameter is known as the
a. interval estimate
b. parameter estimate
c. confidence level

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