Chapter 08 Section 2 - CHAPTER 8 SECTION 2 CONTINUOUS PROBABILITY DISTRIBUTIONS TRUE\/FALSE 55 A national standardized testing company can tell you your

# Chapter 08 Section 2 - CHAPTER 8 SECTION 2 CONTINUOUS...

• Notes
• 12
• 95% (65) 62 out of 65 people found this document helpful

This preview shows page 1 - 3 out of 12 pages.

CHAPTER 8 SECTION 2: CONTINUOUS PROBABILITY DISTRIBUTIONSTRUE/FALSE55.A national standardized testing company can tell you your relative standing on an exam without divulging the mean or the standard deviation of the exam scores.PTS:1REF:SECTION 8.2NAT:Analytic; Probability Distributions56.If your golf score is 3 standard deviations below the mean, its corresponding value on the distribution is -3.Z PTS:1REF:SECTION 8.2NAT:Analytic; Probability Distributions57.If we standardize the normal curve, we express the originalX values in terms of their number of standard deviations away from the mean.PTS:1REF:SECTION 8.2NAT:Analytic; Probability Distributions58.A normal distribution is symmetric; therefore the probability of being below the mean is 0.50 and the probability of being above the mean is 0.50.PTS:1REF:SECTION 8.2NAT:Analytic; Probability Distributions59.A random variable Xis standardized by subtracting the mean and dividing by the variance.PTS:1REF:SECTION 8.2NAT:Analytic; Probability Distributions60.A random variable Xhas a normal distribution with mean 132 and variance 36. If x= 120, its corresponding value of Zis 2.0.PTS:1REF:SECTION 8.2NAT:Analytic; Probability Distributions61.A random variable Xhas a normal distribution with a mean of 250 and a standard deviation of 50. Given that X= 175, its corresponding value of Zis -1.50.PTS:1REF:SECTION 8.2NAT:Analytic; Probability Distributions62.Given that Z is a standard normal random variable, a negative value of Zindicates that the standard deviation of Z is negative.PTS:1REF:SECTION 8.2NAT:Analytic; Probability Distributions
63.In the standard normal distribution, z0.05= 1.645 means that 5% of all values of zare below 1.645 and 95% are above it.PTS:1REF:SECTION 8.2NAT:Analytic; Probability Distributions64.The probability that a standard normal random variable Zis less than -3.5 is approximately 0.PTS:1REF:SECTION 8.2NAT:Analytic; Probability Distributions65.If the value of Zis z= 99, that means you are at the 99thpercentile on the Zdistribution.PTS:1REF:SECTION 8.2NAT:Analytic; Probability Distributions66.The 10thpercentile of a Zdistribution has 10% of the Z-values lying above it.PTS:1REF:SECTION 8.2NAT:Analytic; Probability Distributions67.The probability that Zis less than -2 is the same as one minus the probability that Zis greater than +2.PTS:1REF:SECTION 8.2NAT:Analytic; Probability Distributions68.Suppose Xhas a normal distribution with mean 70 and standard deviation 5. The 50thpercentile of X70.is PTS:1REF:SECTION 8.2NAT:Analytic; Probability DistributionsMULTIPLE CHOICE