12
QuizMultiple Choice
Testing a Claim about a Difference between Proportions — Unit test
Question 12 • AQR_A_IC
A computer company wants to determine the proportion of defective computer chips from a day’s production. A quality control specialist takes a random sample of 100 chips from the day’s production and determines that there are 12 defective chips. Assuming all conditions are met, he constructs a 95% confidence interval for the true proportion of defective chips from a day’s production. What are the calculations for this interval?
Answer
A
12 plus-or-minus 1.65 StartRoot StartFraction 12 (1 minus 12) Over 100 EndFraction EndRoot
B
12 plus-or-minus 1.96 StartRoot StartFraction 12 (1 minus 12) Over 100 EndFraction EndRoot
C
0.12 plus-or-minus 1.65 StartRoot StartFraction 0.12 (1 minus 0.12) Over 100 EndFraction EndRoot
D
0.12 plus-or-minus 1.96 StartRoot StartFraction 0.12 (1 minus 0.12) Over 100 EndFraction EndRoot