BUAL 2650 Final Exam |\ |\ |\ |\
QUESTIONS WITH ANSWERS |\ |\
Suppose that a random variable x has a uniform distribution with c
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
= 2 and d =8. Find P(3 <= x <= 5) - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔.333
Find the area under the normal curve when P(Z > -2) - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔.9772 |\
Find the area under the normal curve between P(1 < z <2) -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔.1359 |\ |\
In a manufacturing process, we are interested in measuring the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
average length of a certain type of bolt. Past data indicate that the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
standard deviation is .25 inches. How many manufactured bolts
|\ |\ |\ |\ |\ |\ |\ |\ |\
should be sampled in order to make us 95 percent confident that the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
sample mean bolt length is within .02 inches of the true mean bolt
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
length? - CORRECT ANSWERS ✔✔601|\ |\ |\ |\
Rejecting a true null hypothesis is called a ________ error. -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Type 1 |\ |\ |\
, A recent study conducted by the state government attempts to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
determine whether the voting public supports a further increase in
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
cigarette taxes. The opinion poll recently sampled 1,500 voting-age
|\ |\ |\ |\ |\ |\ |\ |\ |\
citizens. 1,020 of the sampled citizens were in favor of an increase in
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
cigarette taxes. The state government would like to decide if there is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
enough evidence to establish whether the proportion of citizens
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
supporting an increase in cigarette taxes is significantly greater than
|\ |\ |\ |\ |\ |\ |\ |\ |\
.66. Identify the null hypothesis. - CORRECT ANSWERS ✔✔p ≤
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
.66
|\
In testing H0: μ= 23; versus HA: μ > 23 using the critical value rule,
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
when x¯ = 26, s = 6, and n = 20, what is the value of the test
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
statistic? Assume that the population from which the sample is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
selected is normally distributed. - CORRECT ANSWERS ✔✔2.24
|\ |\ |\ |\ |\ |\ |\
In a manufacturing process, a random sample of 36 manufactured
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
bolts has a mean length of 3 inches with a standard deviation of .3
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
inches. What is the 99 percent confidence interval for the true mean
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
length of the manufactured bolt? - CORRECT ANSWERS ✔✔2.228
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
to 3.772
|\
A confidence interval for the population mean is an interval
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
constructed around the ________. - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\
✔✔sample mean |\
QUESTIONS WITH ANSWERS |\ |\
Suppose that a random variable x has a uniform distribution with c
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
= 2 and d =8. Find P(3 <= x <= 5) - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔.333
Find the area under the normal curve when P(Z > -2) - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔.9772 |\
Find the area under the normal curve between P(1 < z <2) -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔.1359 |\ |\
In a manufacturing process, we are interested in measuring the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
average length of a certain type of bolt. Past data indicate that the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
standard deviation is .25 inches. How many manufactured bolts
|\ |\ |\ |\ |\ |\ |\ |\ |\
should be sampled in order to make us 95 percent confident that the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
sample mean bolt length is within .02 inches of the true mean bolt
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
length? - CORRECT ANSWERS ✔✔601|\ |\ |\ |\
Rejecting a true null hypothesis is called a ________ error. -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Type 1 |\ |\ |\
, A recent study conducted by the state government attempts to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
determine whether the voting public supports a further increase in
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
cigarette taxes. The opinion poll recently sampled 1,500 voting-age
|\ |\ |\ |\ |\ |\ |\ |\ |\
citizens. 1,020 of the sampled citizens were in favor of an increase in
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
cigarette taxes. The state government would like to decide if there is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
enough evidence to establish whether the proportion of citizens
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
supporting an increase in cigarette taxes is significantly greater than
|\ |\ |\ |\ |\ |\ |\ |\ |\
.66. Identify the null hypothesis. - CORRECT ANSWERS ✔✔p ≤
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
.66
|\
In testing H0: μ= 23; versus HA: μ > 23 using the critical value rule,
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
when x¯ = 26, s = 6, and n = 20, what is the value of the test
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
statistic? Assume that the population from which the sample is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
selected is normally distributed. - CORRECT ANSWERS ✔✔2.24
|\ |\ |\ |\ |\ |\ |\
In a manufacturing process, a random sample of 36 manufactured
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
bolts has a mean length of 3 inches with a standard deviation of .3
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
inches. What is the 99 percent confidence interval for the true mean
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
length of the manufactured bolt? - CORRECT ANSWERS ✔✔2.228
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
to 3.772
|\
A confidence interval for the population mean is an interval
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
constructed around the ________. - CORRECT ANSWERS |\ |\ |\ |\ |\ |\ |\
✔✔sample mean |\
