BUAL Exam 1 Study Guide Questions
and Answers
The ________ is a graphic that is used to visually check whether data come from a normal population. -
Answer-normal probability plot
It is appropriate to use the uniform distribution to describe a continuous random variable x when -
Answer-relative frequencies of all possible values of x are about the same.
The normal approximation of the binomial distribution is appropriate when - 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 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 - Answer-the fill weight is less than 910
grams.
Which of the following statements is not a property of the normal probability distribution? - Answer-
95.44 percent of all possible observed values of the random variable x are within plus or minus three
standard deviations of the population mean.
If the random variable x is normally distributed, ______ percent of all possible observed values of x will
be within three standard deviations of the mean. - Answer-99.73
and Answers
The ________ is a graphic that is used to visually check whether data come from a normal population. -
Answer-normal probability plot
It is appropriate to use the uniform distribution to describe a continuous random variable x when -
Answer-relative frequencies of all possible values of x are about the same.
The normal approximation of the binomial distribution is appropriate when - 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 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 - Answer-the fill weight is less than 910
grams.
Which of the following statements is not a property of the normal probability distribution? - Answer-
95.44 percent of all possible observed values of the random variable x are within plus or minus three
standard deviations of the population mean.
If the random variable x is normally distributed, ______ percent of all possible observed values of x will
be within three standard deviations of the mean. - Answer-99.73
