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SME_8e_Ch_08_Section_2

# SME_8e_Ch_08_Section_2 - CHAPTER 8 SECTION 2 CONTINUOUS...

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1 CHAPTER 8 SECTION 2: CONTINUOUS PROBABILITY DISTRIBUTIONS MULTIPLE CHOICE 55. A standard normal distribution is a normal distribution with: a. a mean of zero and a standard deviation of one. b. a mean of one and a standard deviation of zero. c. a mean always larger than the standard deviation. d. None of these choices. ANS: A PTS: 1 REF: SECTION 8.2 56. What proportion of the data from a normal distribution is within two standard deviations from the mean? 57. Given that Z is a standard normal random variable, the area to the left of a value z is expressed as 58. If X has a normal distribution with mean 60 and standard deviation 6, which value of X corresponds with the value z = 1.96? 59. Which of the following is not a characteristic for a normal distribution? a. It is symmetrical. b. The mean is always zero. c. The mean, median, and mode are all equal. d. It is a bell-shaped distribution. ANS: B PTS: 1 REF: SECTION 8.2

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2 60. Given that Z is a standard normal variable, the variance of Z : 61. Given that Z is a standard normal random variable, a negative value ( z ) on its distribution would indicate: 62. A larger standard deviation of a normal distribution indicates that the distribution becomes: 63. In its standardized form, the normal distribution: a. has a mean of 0 and a standard deviation of 1. b. has a mean of 1 and a variance of 0. c. has an area equal to 0.5. d. cannot be used to approximate discrete probability distributions. ANS: A PTS: 1 REF: SECTION 8.2
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SME_8e_Ch_08_Section_2 - CHAPTER 8 SECTION 2 CONTINUOUS...

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