BUAL 2650 GUPTA EXAM 1 UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

BUAL 2650 GUPTA EXAM 1 UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS

Question:
1. 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.

Question:
2. The normal approximation of the binomial distribution is appropriate when
Answer:
np e 5 and n(1 − p) e 5.

Question:
3. 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.

Question:
4. 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 minusthree
standard deviations of the population mean.

Question:
5. 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

Question:
6. The z value tells us the number of ________ that a value of x is from the mean
Answer:
standard deviations

Question:
7. A continuous probability distribution having a rectangular shape, where the probability is evenly
distributed over an interval of numbers is a(n) ________ distribution.
Answer:
uniform

Question:
8. The specific shape of each normal distribution is determined by its ________ and ________.