QNT 561 FINAL EXAM – QUESTION AND ANSWERS

QNT 561 FINAL EXAM – QUESTION AND ANSWERS If x is a binomial random variable with n=10 and p=0.8, what is the probability that x is equal to 4? • .0055 • .0063 • .232 • .994 • .124 The weight of a USB flash drive is 30 grams and is normally distributed. Periodically, quality control inspectors at Dallas Flash Drives randomly select a sample of 17 USB flash drives. If the mean weight of the USB flash drives is too heavy or too light the machinery is shut down for adjustment; otherwise, the production process continues. The last sample showed a mean and standard deviation of 31.9 and 1.8 grams, respectively. Using  = 0.10, the appropriate decision is _______. • fail to reject the null hypothesis and do not shut down the process) do nothing • fail to reject the null hypothesis and shut down the process • reject the null hypothesis and shut down the process • reject the null hypothesis and do not shut down the process Consider the following null and alternative hypotheses. Ho:  ≤ 67 Ha:  > 67 These hypotheses _______________. • indicate a one-tailed test with a rejection area in the left tail Catherine Chao, Director of Marketing Research, is evaluating consumer acceptance of a new toothpaste package. Her staff reports that 17% of a random sample of 200 households prefers the new package to all other package designs. If Catherine concludes that 17% of all households prefer the new package, she is using _______.