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

Question

DQuestion 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, 0.689) (a) How many of the 50 sample tubes were able to withstand 1.1 atmospheres? I 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) for point estiimate of proportion =(lower limit+upper limit)/2 of any interval =0.6

theefore number of tubes able to withstanda =50*0.6 =30

b) for lower confidnece interval has lowest width

therefore corect option is D (0.511 ; 0.689)

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