Slide 6- 1 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Active Learning Lecture Slides For use with Classroom Response Systems Elementary Statistics Tenth Edition and the Triola Statistics Series by Mario F. Triola Chapter 6 Normal Probability Distributions

Slide 6- 2 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Assume that the weight loss for the first month of a diet program varies between 6 pounds and 12 pounds, and is spread evenly over the range of possibilities, so that there is a uniform distribution. Find the probability of losing less than 10 pounds. A. 5/7 B. 2/3 C. 1/3 D. 1/6

Slide 6- 3 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Assume that the weight loss for the first month of a diet program varies between 6 pounds and 12 pounds, and is spread evenly over the range of possibilities, so that there is a uniform distribution. Find the probability of losing less than 10 pounds. A. 5/7 B. 2/3 C. 1/3 D. 1/6

Slide 6- 4 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley A recent survey based upon a random sample of 420 voters, predicted that the Independent candidate for the mayoral election will get 24% of the vote, but he actually gets 27%. Can you conclude that the survey was done incorrectly? A. Yes B. No

Slide 6- 5 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley A recent survey based upon a random sample of 420 voters, predicted that the Independent candidate for the mayoral election will get 24% of the vote, but he actually gets 27%. Can you conclude that the survey was done incorrectly? A. Yes B. No

Slide 6- 6 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley If Z is a standard normal variable, find the probability that Z lies between 0.7 and A B C D

Slide 6- 7 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley If Z is a standard normal variable, find the probability that Z lies between 0.7 and A B C D

Slide 6- 8 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley A final exam in Math 160 has a mean of 73 with a standard deviation of 7.8. If 24 students are randomly selected, find the probability that he mean of their test scores is less than 70. A B C D

Slide 6- 9 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley A final exam in Math 160 has a mean of 73 with a standard deviation of 7.8. If 24 students are randomly selected, find the probability that he mean of their test scores is less than 70. A B C D

Slide Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley For a normal distribution with n = 53 and p =.7, state whether or not it is suitable to use the normal distribution as an approximation? A. Normal approximation is not suitable. B. Normal approximation is suitable.

Slide Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley For a normal distribution with n = 53 and p =.7, state whether or not it is suitable to use the normal distribution as an approximation? A. Normal approximation is not suitable. B. Normal approximation is suitable.