BADM 5140 EXAMII CH8-15

BADM 5140 EXAMII CH8-15 - CHAPTER 8 One assumption...

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CHAPTER 8 One assumption underlying the use of the confidence interval estimate for the proportion using the normal distribution is that both “X,” and “n-X” are less than five. Your Answer: True Correct Answer: False INCORRECT. Actually, both “X,” and “n-X” must be greater than five. See Section 8.3, “Confidence Interval Estimate for the Proportion (p. 297). 2. The Z-critical values used when computing confidence intervals for the proportion vary by degrees of freedom. Your Answer: True Correct Answer: False INCORRECT. The t -critical values used when computing confidence intervals for the mean vary by degrees of freedom. 3. The sample mean is a point estimate of the population mean. Your Answer: True CORRECT. See discussion on “Point Estimate,” (p. 284). 4. At degrees of freedom less than 100 (refer to the table, “Critical Values of t,”) t values are always smaller than Z values, at the same degree of confidence. Your Answer: True Correct Answer: False INCORRECT. Values of t-critical are actually larger than Z-critical values. 5. The confidence interval estimate of the population mean is constructed around the
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sample mean. Your Answer: True CORRECT. See discussion on “confidence interval estimate,” (p. 284). 6. The tails of the t distribution contain less area than the tails of the normal distribution. Your Answer: True Correct Answer: False INCORRECT. Refer to the section on "Properties of the t Distribution." (P. 290) 7. You may usually use the normal distribution to set up a confidence interval estimate of the population proportion if the sample size is “sufficiently” large. Your Answer: True CORRECT. Refer to the comment on page 298, Section 8.3, regarding the use of the normal probability distribution to approximate the binomial distribution. 8. The confidence interval obtained will always correctly estimate the true population parameter. Your Answer: False CORRECT. One never knows for certain whether or not the specific interval includes the true population mean. .. 9. The larger the sampling error acceptable to the researcher, the smaller the minimum required sample size needs to be. Your Answer: True CORRECT. Refer to Equation 8.4, (p. 300).
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10. The t distribution is used to construct confidence intervals for the population mean when the population standard deviation (i.e., sigma) is known. Your Answer: False CORRECT. Refer to the comment on page 298, Section 8.3, regarding the use of the normal probability distribution to approximate the binomial distribution. 11. Other things being equal, as the confidence level for a confidence interval for either the mean or the proportion increases, the width of the interval increases. Your
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BADM 5140 EXAMII CH8-15 - CHAPTER 8 One assumption...

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