Question

23. A company claims that at least 98% of its computer chips are perfect and defect free. A random sample of 1000 chips is drawn and only 950 chips are found to be perfect. The calculated value of the test statistic is: (a) -6.78 (6) -4.52 (C) -2.575 (0) 4.52 (e) more than 6.00 24. A subjective probability is: (a) The probability of two events occurring together. (b) The probability of an event given that we know that another event has definitely occurred. (c) The probability of an event. (d) The strength of one's personal belief. (e) The sum of the probabilities of all possible outcomes. 25. Given events A and B. we know the following probabilities: P(A) - .50, P(B),40, and P(AB) - .80. What is the P(BA)? (a).24 ().36 (c).46 (d).64 (e) more than 70 26. A researcher is examining some data and observes that it has a very strong positive skew (right-skewed). This implies that: (a) The mean is equal to the median. (b) The mean is greater than the median. (c) The median is greater than the mean. (d) The mode is greater than the mean. (e) The mode is equal to the median.

Answer 1

Here we have: n= 1000 x = 950 Sample proportion: 950 X 6 = = = n = 0.95 1000 Hypothesis: H.; P = 0.98 Ha; P >0.98 Test statistics: Z-test

p- 0.95-0.98 z= = = -6.78 p(1-p) п 0.98(1-0.98) 1000 Correct option "A" -6.78

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