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A sample of 150 new cell phones produced by Yeskia found that 12 had cosmetic flaws. A 90% confidence interval for the proportion of all new Yeskia phones with cosmetic flaws is 0.044 to 0.116. Which statement below provides the correct interpretation of this confidence interval?
a. There is a 90% chance that the proportion of new phones that have cosmetic flaws is between 0.044 and 0.116.
b. There is at least a 4.4% chance that a new phone will have a cosmetic flaw.
c. A sample of 150 phones will have no more than 11.6% with cosmetic flaws.
d. If you selected a very large number of samples and constructed a confidence interval for each, 90% of these intervals would include the proportion of all new phones with cosmetic flaws. e. none of the above
If population A has a larger standard deviation than population B, which of the following is NOT true?
a. Population B has a smaller variance than population A.
b. The mean of a sample of 20 from population A has a larger standard deviation than the mean of a sample of 20 from population B.
c. A typical observation from population A will be farther from the mean of population A than a typical observation from B will be from the mean of population B.
d. The mean of a sample from population A will on average be larger than the mean of a sample from population B. e. none of the above