9.1

B. In a survey of 2085 adults in a certain country conducted during a period of economic uncertainty, 51% thought that wages paid to workers in industry were too low. The margin of error was 9 percentage points with 90% condence. For parts (a) through (d) below, which represent a reasonable interpretation of the survey results? For those that are not reasonable, explain the flaw. (a) We are 90% condent SW; of adults in the country during the period of economic uncertainty felt wages paid to workers in industry were too low. Is the interpretation reasonable? A. The interpretation is reasonable. '-,.' B. The interpretation is flawed. The interpretation indicates that the level of condence is varying. \"t: The interpretation is awed. The interpretation suggests that this interval sets the standard for all the other intervals, which is not true. - _*- D. The interpretation is awed. The interpretation provides no interval about the population proportion. to) We are 81% to 99% condent an; of adults in the country during the period of economic uncertainty felt wages paid to workers in industry were too low. Is the interpretation reasonable? ' - A. The interpretation is reasonable. '- - B. The interpretation is awed. The interpretation suggests that this interval sets the standard for all the other intervals, which is not true. 1* C. The interpretation is awed. The interpretation indicates that the level of condence is varying. 'ix- D. The interpretation is flawed. The interpretation provides no interval about the population proportion. to) We are 90% condent that the interval from 0.48 to 0.66 contains the the proportion of adults in the country during the period of economic uncertainty who believed wages paid to workers in industry were too low. Is the interpretation reasonable? 0 A. The interpretation is reasonable. 0 B. The interpretation is awed. The interpretation provides no interval about the population proportion. O C. The interpretation is awed. The interpretation indicates that the level of condence is varying. O D. The interpretation is awed. The interpretation suggests that this interval sets the standard for all the other intervals, which is not true. (d) In 90% of samples of adults in the country during the period of economic unceitainty, the proportion who believed wages paid to workers in industry were too low is between 0.48 and 0.66. Is the interpretation reasonable? 0 A. The interpretation is reasonable. 0 B. The interpretation is awed. The interpretation indicates that the level of condence is varying. O C. The interpretation is awed. The interpretation suggests that this interval sets the standard for all the other intervals, which is not true. 0 D. The interpretation is flawed. The interpretation provides no interval about the population proportion. YOU ANSWERED: C