Question

Question 4- of 10 Step 2 of 2 01:26:58 A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes which are defective. Step 2 of 2: Suppose a sample of 2346 floppy disks is drawn. Of these disks, 375 were defective. Using the data, construct the 85 % confidence interval for the population proportion of disks which are defective. Round your answers to three decimal places. Answer How to Enter) 1 Point Tables Keyрad Lower endpoint Upper endpoint Prev 0 2019 Hawkes Learning MacBook 0

Answer 1

Here we have: n 2346 x 375 Sample proportion: 375 = 0.16 2346 n a 1-0.85 0.15 (85% confidence level) Critical value: Zcrit Za/p Zo.15/2 =1.44

Confidence interval: (1-p) P pZ 0.16(1-0.16) = 0.16 1.44 2346 =0.160.011 = 0.149 < P < 0.171 Lower end point 0.149 Upper end point 0.171