Alexander, a meteorologist, is studying the daily high temperatures over the pas

Question

Alexander, a meteorologist, is studying the daily high temperatures over the past 50 years during the month of July for the cities of Chicago and Phoenix (a sample size of 1550 July days for each city). Alexander found that in Chicago, the middle 95% of July days have a high temperature between 70 degree F and 98 degree F, while in Phoenix, the middle 95% of July days have a high temperature between 94 degree F and 110 degree F. On one particular July day, the temperature in Phoenix is exactly 17 degree F higher than the temperature in Chicago. Which of the following is not a valid pair of z-scores for the two cities? Circle your answer.

Explanation / Answer

Chicago:Z=1.7143

Phoenix: Z=-3.2500

since for Chicago P(70<X<98)=0.95

since for Phoenix P(94<X<110)=0.95

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