2. A 95% confidence interval infers that the population mean
a. is between 0 and 100%
b. is within + and – 1.96 standard deviations of the sample mean
c. is within + and – 1.96 standard deviations of the population mean
d. is within + and – .25 standard deviations of the sample mean
3. College officials indicate that at least 70% of the voting student population supports the proposed tuition and fee increase. If the 95% confidence interval is 0.75 to 0.85, what conclusion can be drawn based on a 95% level of confidence?
a. 70% is not in the interval, need to take another sample
b. 70% is not in the interval, so assume it will not be supported
c. 70% is below the interval, so assume it will be supported
d. Since this estimate was not based on the voting student population, we cannot make a decision
4. A sample of twenty-five is selected from a known population of one hundred elements. What is the finite population correction factor?
a. 8.66
b. 75
c. 0.87
d. cannot be determined
5. Which concept is a test statistic used to test a hypothesis about a population mean?
a. the alpha level
b. the Type II error
c. the population mean
d. the z statistic
Questions 6 and 7 pertain to the following data set:
6. Based on the Nielson Ratings, the local CBS affiliate television station claims its 11:00 pm newscast reaches 41% of the viewing audience in the market area. In a survey of 100 viewers, 36% indicated that they watch the late evening news on this local CBS affiliate televisions station. What is the research hypothesis?
a. The population proportion is equal to 36%
b. The population proportion is equal to 41%
c. The population proportion is not equal to 36%
d. The population mean is equal to 41%
7. What is the null hypothesis?
a. The population proportion is equal to 36%
b. The population proportion is equal to 41%
c. The population proportion is not equal to 41%
d. The population mean is not equal to 41%
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