Statistics 9.1 Homework
8. 9. In a survey of 2085 adults in a certain country conducted during a period of economic uncertainty. 57% 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 ot the survey results? For those that are not reasonable. explain the aw. (a) We are 90% condent 57% 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? 0 A. The interpretation is reasonable. 0 B. The interpretation is flawed. The interpretation indicates that the level of confidence is varying. O C. The interpretation is flawed. 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. (b) We are 81% to 99% condent 57% 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? 0 A. The interpretation is reasonable. 0 B. The interpretation is awed. The interpretation suggests that this interval sets the standard for all the other intervals. which is not true. 0 C. The interpretation is flawed. The interpretation indicates that the level of confidence is varying. O D. The interpretation is flawed. The interpretation provides no interval about the population proportion. (c) We are 90% condent that the interval from 0.48 to 0.66 contains the true 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 flawed. The interpretation provides no interval about the population proportion. O C. The interpretation is flawed. The interpretation indicates that the level of confidence is varying. O D. The interpretation is flawed. The interpretation suggests that this interval sets the standard for all the other intervals. which is not true. (It) In 90% of samples of adults in the country during the period of economic uncertainty, 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 flawed. The interpretation indicates that the level of confidence is varying. O C. The interpretation is flawed. 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. A national survey of 1400 adult citizens of a nation found that 21% dreaded Valentine's Day. The margin of error for the survey was 1.6 percentage points with 85% condence. Explain what this means. Which statement below is the best explanation? Select all that apply. I] A. There is 85% condence that the proportion of the adult citizens of the nation that did not dread Valentine's Day is between 0.774 and 0.806. [I B. There is a 85% probability that the proportion of the adult citizens of the nation that dreaded Valentine's Day is between 0.774 and 0.806. [I C. There is 83.4% to 86.6% condence that 21% of the adult citizens of the nation dreaded Valentine's Day. I] D. In 85% of samples of adult citizens of the nation. the proportion that dreaded Valentine's Day is between 0.194 and 0.226. I] E. There is 85% condence that the proportion of the adult citizens of the nation that dreaded Valentine's Day is between 0.194 and 0.226. I] F. There is 85% condence that 21% of the adult citizens of the nation dreaded Valentine's Day
