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 _______.
a range estimate
a point estimate
an exact estimate
a statistical parameter
an interval estimate
Suppose a population has a mean of 400 and a standard deviation of 24. If a random sample of
size 144 is drawn from the population, the probability of drawing a sample with a mean less
than 402 is _______.
0.6826
0.8413
0.1587
0.9875
0.3413
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 _______.
a range estimate
a point estimate
an exact estimate
a statistical parameter
an interval estimate
Suppose a population has a mean of 400 and a standard deviation of 24. If a random sample of
size 144 is drawn from the population, the probability of drawing a sample with a mean less
than 402 is _______.
0.6826
0.8413
0.1587
0.9875
0.3413
