was isund to be 21.5 years. Assume the standard deviation for the age of Scion tound average age of thé drivers drivers is 2.3 years. a. Construct a 95% confidence interval to estimate the average a b. Does this result lend support to Toyota's claim? c. What assumption needs to be made for this procedure? ge of a Scion driver mob门 The US air traffic control system handled an average of 47,529 flights during 30 randomly selected days, The standard deviation for this sample is 6,210 flights per day. 6. Construct a 99% confidence interval to estimate the average number of flights per day handled by the a. 01 system. Suppose the current system can safely handle 50,000flights per day. What conclusion can be drawn with these results? What assumptions need to be made about this population? b. c. 7 The US Department of Education reported that in 2007, 67% of students enrolled in college or a trade school within 12 months of graduating from high school. In 2013, a random sample of 160 individuals who graduated from high school 12 months prior was selected. From this sample, 102 students were found to be enrolled in college or a trade school. edl 8.S2 Construct a 90% confidence interval to estimate the actual proportion of students enrolled in college or a trade school within 12 months of graduating from high school in 2013. What is the margin of error for this sample? Based on this sample, is there any evidence that this proportion has changed since 2007? a. b. c. The state of New Jersey would like to stimate the proportion of voters who intend to participate in the upcoming statewide elections. A pilot sample of 50 voters found that 36 of them intended to vote in the 8 Determine the additional number of voters that need to be sampled to construct a 95% interval with a ection