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Chapter 6 test solutions

# Chapter 6 test solutions - CHAPTER 6CONTINUOUS PROBABILITY...

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CHAPTER 6 CONTINUOUS PROBABILITY DISTRIBUTIONS MULTIPLE CHOICE 1. The center of a normal curve is a. always equal to zero b. is the mean of the distribution c. cannot be negative d. is the standard deviation ANS: B PTS: 1 TOP: Continuous Probability Distributions 2. The probability that a continuous random variable takes any specific value is equal to zero is at least 0.5 depends on the probability density function is very close to 1.0

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3. A normal distribution with a mean of 0 and a standard deviation of 1 is called a probability density function an ordinary normal curve a standard normal distribution None of these alternatives is correct. 4. The z score for the standard normal distribution is always equal to zero can never be negative can be either negative or positive is always equal to the mean 5. In a standard normal distribution, the probability that Z is greater than zero is a. 0.5
b. equal to 1 c. at least 0.5 d. 1.96 ANS: A PTS: 1 TOP: Continuous Probability Distributions 6. A negative value of Z indicates that the number of standard deviations of an observation is to the right of the mean the number of standard deviations of an observation is to the left of the mean a mistake has been made in computations, since Z cannot be negative the data has a negative mean 7. The uniform, normal, and exponential distributions are

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all continuous probability distributions all discrete probability distributions can be either continuous or discrete, depending on the data all the same distributions 8. A value of 0.5 that is added and/or subtracted from a value of x when the continuous normal distribution is used to approximate the discrete binomial distribution is called 50% of the area under the normal curve continuity correction factor factor of conversion all of the alternatives are correct answers 9. For a continuous random variable x, the probability density function f(x) represents a. the probability at a given value of x b.
the area under the curve at x c. the area under the curve to the right of x d. the height of the function at x ANS: D PTS: 1 TOP: Continuous Probability Distributions

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Chapter 6 test solutions - CHAPTER 6CONTINUOUS PROBABILITY...

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