.A magazine provided results from a poll of 63 adults who were asked to identify their favorite pie. Among the respondents, 12 chose chocolate pie. If the confidence level is 90%, calculate the confidence interval for the proportion of adults who identify chocolate pie as their favorite pie. Enter the upper bound of the confidence interval as a percentage without the % sign. (Round your percentage to the nearest tenth.)
1.A magazine provided results from a poll of 63 adults who were asked to identify their favorite pie. Among the respondents, 12 chose chocolate pie. If the confidence level is 90%, calculate the confidence interval for the proportion of adults who identify chocolate pie as their favorite pie.
Enter the upper bound of the confidence interval as a percentage without the % sign. (Round your percentage to the nearest tenth.)
2.You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you survey? Assume that you want to be 99% confident that the sample percentage is within 2.6 percentage points of the true population percentage.
3.Salaries of 25 college graduates who took a statistics course in college have a mean of $76,264 and a standard deviation of $1,456. Assume that prior studies have shown that the standard deviation of salaries of college graduates who have taken a statistics course in college is $2000. Construct a 98% confidence
Enter the upper bound of the confidence interval. (Round your answer to nearest whole dollar.)
4.Salaries of 11 college graduates who took a statistics course in college have a mean of $80,548 and a standard deviation of $1,518. Construct a 95% confidence interval for estimating the population standard deviation.
Enter the upper bound of the confidence interval. (Round your answer to nearest whole dollar.)
5.John wishes to estimate the population standard deviation of salary of college graduates who took a statistics course in college. How many college graduates must he survey? Assume that he wants to be the sample standard deviation to be within 50% of the population standard deviation and to be 99% confident of that statement.
Compute the absolute value of the test statistic. (Round your answer to nearest hundredth. Hint: The correct test statistic is positive.)
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