Question

Question 6 (1 point)

Suppose you are a civil engineer, specializing in traffic volume control for the City of Grand Rapids. Your department has been receiving a multitude of complaints about traffic wait times for a certain intersection in the heart of downtown. To see if these claims are valid, you want to monitor the true average wait time at that intersection. Over the course of a few months, you record the average number of minutes a car waits at the intersection between 4:00 PM and 5:00 PM. With a sample size of 14 cars, the average wait time is 6.313 minutes with a standard deviation of 1.6509 minutes. Construct a 90% confidence interval for the true average wait time for a car at the intersection between 4:00 PM and 5:00 PM.

Question 6 options:

	1) ( 5.872 , 6.754 )
	2) ( 4.542 , 8.084 )
	3) ( 5.532 , 7.094 )
	4) ( -5.532 , 7.094 )
	5) ( 5.536 , 7.09 )

Answer 1

n- 14 mean6.313 standard deviati an = σ=i.6s09 se have to construct 9ol. confidence inteva fo tmue avexase wait time fox car N ow mele size is small Cbelow 3a) we七ake since the sa the samele size and dlegrees f substrade 1 to ger.the ook UP the ta value fos t3 urtn confidence level oF go, co e get value i.ㄱ기 -Fronn-t-taole 6.313ャ 0.4412 x (1-7 () = ㄱ.og4 6-313-o-4412夭C1.7기) Thes -fo se, 9 o Confidence intervau fos me average wait time fors Cor is, S $32 7.1 Answes is, 3) CS. s32 ,7.9