BUAL Exam 1 study guide 2025 with
Complete Solutions
The is a graphic that is used to visually check whether data come from a normal po
pulation. - CORRECT ANSWER -normal probability plot
It is appropriate to use the uniform distribution to describe a continuous random variable x w
hen - CORRECT ANSWER -relative frequencies of all possible values of x are about the same.
The normal approximation of the binomial distribution is appropriate when -
CORRECT ANSWER -np ≥ 5 and n(1 − p) ≥ 5.
The fill weight of a certain brand of adult cereal is normally distributed with a mean of 910 gr
ams and a standard deviation of 5 grams. We calculated the value of z for a specific box of thi
s brand of cereal, and the z value was negative. This negative z value indicates that -
CORRECT ANSWER -the fill weight is less than 910 grams.
Which of the following statements is not a property of the normal probability distribution? -
CORRECT ANSWER -
95.44 percent of all possible observed values of the random variable x are within plus or minu
s three standard deviations of the population mean.
If the random variable x is normally distributed, percent of all possible observed value
s of x will be within three standard deviations of the mean. - CORRECT ANSWER -99.73
The z value tells us the number of that a value of x is from the mean -
CORRECT ANSWER -standard deviations
Complete Solutions
The is a graphic that is used to visually check whether data come from a normal po
pulation. - CORRECT ANSWER -normal probability plot
It is appropriate to use the uniform distribution to describe a continuous random variable x w
hen - CORRECT ANSWER -relative frequencies of all possible values of x are about the same.
The normal approximation of the binomial distribution is appropriate when -
CORRECT ANSWER -np ≥ 5 and n(1 − p) ≥ 5.
The fill weight of a certain brand of adult cereal is normally distributed with a mean of 910 gr
ams and a standard deviation of 5 grams. We calculated the value of z for a specific box of thi
s brand of cereal, and the z value was negative. This negative z value indicates that -
CORRECT ANSWER -the fill weight is less than 910 grams.
Which of the following statements is not a property of the normal probability distribution? -
CORRECT ANSWER -
95.44 percent of all possible observed values of the random variable x are within plus or minu
s three standard deviations of the population mean.
If the random variable x is normally distributed, percent of all possible observed value
s of x will be within three standard deviations of the mean. - CORRECT ANSWER -99.73
The z value tells us the number of that a value of x is from the mean -
CORRECT ANSWER -standard deviations
