Question 11 2 pts A glass tube is designed to withstand a pressure differential

Question

Question 11 2 pts A glass tube is designed to withstand a pressure differential of 1.1 atmospheres. Quality control tests a sample of 50 such tubes and generates the following four confidence intervals for the proportion of all such glass tubes able to withstand 1.1 atmospheres: A: (0.422,0.778) B: (0.464, 0.736) C: (0.486, 0.714) D: (0.511, O.689) (a) How many of the 50 sample tubes were able to withstand 1.1 atmospheres? Select ] (b) The confidence levels of the intervals are (in no particular order): 90%, 99%, 95%, and 80%, which of them is the 80% confidence interval? [ Select]

Explanation / Answer

a) here from abve point estimate of proportion =(0.422+0.778)/2=0.6

hence number of tubes able to withstand 1.1 atmosphere =np =50*0.6=30

b)as 80% CI will be narrower ; tehrefore option D

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