# Chapter 8 39012lW 5. Toyota Motor Corporation developed the Scion car model to appeal to young consumers. Toyota claims the average age of a Scion driver is 26 years old. Suppose a random sample of 18 Scion drivers was drawn, and the average age of the drivers was found to be 27.5 years. Assume the standard deviation for the age of Sciongsn drivers is 2.3 years. eivom s to goli0 5251V5 9r .2y vD 18 7 0 noia adATsnoisiert of gnibiopA Construct a 95% confidence interval to estimate the average age of a Scion driver. er2 26w S1O .bstpole yimobns .! a. b. Does this result lend support to Toyota's claim? c. What assumption needs to be made for this procedure? 97 lo wo e bushbnct ertthus 58 .6 catre nortl zal dsdong erlt 2i torlW.d The US air traffic control system handled an average of 47,529 flights during 30 randomly selected days, The 6. standard deviation for this sample is 6,210 flights per day. dpin ort ai dodW b a. Construct a 99% confidence interval to estimate the average number of flights per day handled hy the qusniniss viibos system. ne 36oy teg AM 0.5 sbreh. Suppose the current system can safely handle 50,000fights per day. What conclusion can be drawn with cotusiveb 0Jins these results? 2 c. What assumptions need to be made about this population? 2 80 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 7. college or a trade school. a. Construct a 90% confidence interval to estimate the actual proportion of students enrolled in college or a school within 12 months of graduating from high school in 2013. error for this sample? 9id that this proportion has changed since 2007?

Question

Number 5 Please, Explain shortcut with TI84 if applicable