Homework Help

If a 0.01 significance level is used does the claim of an advertiser that among the...

user profile pic

surfer3 | (Level 1) Valedictorian

Posted June 4, 2012 at 11:35 PM via web

dislike 1 like

If a 0.01 significance level is used does the claim of an advertiser that among the households with tv sets in use, less than 20% were tuned into 60 minutes.

A recently televised broadcast of 60 minutes had a 15 share, meaning that among 5000 monitored households with tv sets in use, 15% of them were tuned into 60 minutes.

1 Answer | Add Yours

user profile pic

justaguide | College Teacher | (Level 2) Distinguished Educator

Posted June 5, 2012 at 5:51 AM (Answer #1)

dislike 1 like

Of the 5000 households with a TV set that were monitored 15% had tuned in to watch the show. The percentage not tuned in was 85%. The confidence interval with a 0.01 significance level is given by `2.575*sqrt((0.15*0.85)/5000) = 0.013` . With a 0.01 significance level the upper level of the percentage of the population watching the show is 0.15 + 0.013 = 16.3% 

This shows that the advertiser's claim that less than 20% of the TV viewing population was tuned in holds.

Sources:

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes