Question

Spend some time looking at the vehicles on the road. Look at the first 40 vehicles that drive by. Take note of the number of vehicles that are cars (sedans). Use the data you collect to construct confidence interval estimates of the proportion of vehicles that are cars (rather than trucks, vans, etc.). Report your confidence interval to the group.

Why might people get different results? Is your sample likely a good representation of the total population of all vehicles? Why or why not?

Please show work and explain how confidence interval was reached.

26 sedans out of 40 were counted.

Expert Answer

Answer 1

Ascoco).) pale:) 8/6/20 Point estimate of population 26 porossition 40 = 0,69 Also, le get the stand994 20031 f P, SP- SP= JP C1:43 = 0.075415516 Now to the critical 2, 0165*0.35 40 n 20/2 = 0.05 2(6/2) = 1.644853627 Thus, a lesegy beind p-2012* sp 20.65- 0.1844748502 = 0.52595 251497 uppeor blend = P +2d/2 tsp = 0.77404748502 thus, the Gnadene intorval is (0.52895 25/497, 0.774047482 Why might people get different results? * The amount of sedans may be dependence on the area where the data was obtained. Is you on sample likely a good the foresenetion of the total population of all vehicles ? why (81) why not? * No, because I only sampled on a certain ques, which most Perobably all mot 91e focagem the total population.