BUAL 2650 FINAL EXAM QUESTIONS
& ANSWERS(RATED A+)
0 - ANSWERSuppose that a random variable x has a uniform distribution with c = 2
and d =8. Find P(3 <= x <= 5)
0 - ANSWERFind the area under the normal curve when P(Z > -2)
0 - ANSWERFind the area under the normal curve between P(1 < z <2)
601 - ANSWERIn 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?
the fill weight is less than 910 grams. - ANSWERThe fill weight of a certain brand of
adult cereal is normally distributed with a mean of 910 grams and a standard
deviation of 5 grams. We calculated the value of z for a specific box of this brand of
cereal, and the z value was negative. This negative z value indicates that.
standard deviations - ANSWERThe z value tells us the number of ________ that a
value of x is from the mean
0 - ANSWERPackages of sugar bags for Sweeter Sugar Inc. have an average
weight of 16 ounces and a standard deviation of .2 ounces. The weights of the sugar
packages are normally distributed. What is the probability that 16 randomly selected
packages will have a weight in excess of 16.075 ounces?
increases - ANSWERAs the standard deviation (σ) decreases, the width of the
confidence interval ________.
Type 1 - ANSWERRejecting a true null hypothesis is called a ________ error.
p ≤ .66 - ANSWERA 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.
& ANSWERS(RATED A+)
0 - ANSWERSuppose that a random variable x has a uniform distribution with c = 2
and d =8. Find P(3 <= x <= 5)
0 - ANSWERFind the area under the normal curve when P(Z > -2)
0 - ANSWERFind the area under the normal curve between P(1 < z <2)
601 - ANSWERIn 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?
the fill weight is less than 910 grams. - ANSWERThe fill weight of a certain brand of
adult cereal is normally distributed with a mean of 910 grams and a standard
deviation of 5 grams. We calculated the value of z for a specific box of this brand of
cereal, and the z value was negative. This negative z value indicates that.
standard deviations - ANSWERThe z value tells us the number of ________ that a
value of x is from the mean
0 - ANSWERPackages of sugar bags for Sweeter Sugar Inc. have an average
weight of 16 ounces and a standard deviation of .2 ounces. The weights of the sugar
packages are normally distributed. What is the probability that 16 randomly selected
packages will have a weight in excess of 16.075 ounces?
increases - ANSWERAs the standard deviation (σ) decreases, the width of the
confidence interval ________.
Type 1 - ANSWERRejecting a true null hypothesis is called a ________ error.
p ≤ .66 - ANSWERA 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.
