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Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter4: Equations Of Linear Functions

Section4.5: Correlation And Causation

Problem 23PFA

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(ill upvote)Suppose one lives in a fairly wealthy Western nation where life expectancy follows a normal distribution with mean μ = 80 and standard deviation σ = 15. One reads a report that claims that 10,000 subjects who took part in a national program for improving their lifespan lived significantly longer (at the 0.05 level of significance) than the population as a whole. In order to determine if the improvement is of practical significance, one should

Select one:

a. run the national program a second time to see if similar results are obtained.

b. use a two-sided test rather than the one-sided test implied by the report.

c. find out the actual mean lifespan of the 10,000 subjects.

d. find out the actual P-value.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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