Question 1172450: Do people of different age groups differ in their response to email messages? A survey reported that75.7 % of users over 70 years of age believe that email messages should be answered quickly, as compared to 53.8 % of users 13 to 50 years old. Suppose that the survey was based on 1,000 users over 70 years of age and 1,000 users 13 to 50 years old. The table to the right summarizes the results. Complete parts (a) through (c).
a. Suppose you know that the respondent is between 13 and 50 years old. What is the probability that he or she answers quickly?
The probability that he or she answers quickly is
Answers_Quickly 13-50 70+ Total
Yes 538 757 1295
No 462 243 705
Total 1000 1000 2000
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! Answers_Quickly 13-50 70+ Total
Yes------------ 538 757 1295
No------------- 462 243 705
Total---------- 1000 1000 2000
It was given as 53.8%
If the question were, suppose you know that somebody answers quickly. What is the probability that they are between 13 and 50?That would be 538/1295.
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