Mathematics, 14.12.2019 03:31 elijahproctor36
Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and prepreview ads before the movie starts. many complain that the time devoted to previews is too long. a preliminary sample conducted by the wall street journal showed that the standard deviation of the amount of time devoted to previews was five minutes. use that as a planning value for the standard deviation in answering the following questions.
a. if we want to estimate the population mean time for previews at movie theaters with a margin of error of 72 seconds, what sample size should be used? assume 95% confidence.
b. if we want to estimate the population mean time for previews at movie theaters with a margin of error of 1 minute, what sample size should be used? assume 95% confidence.
Answers: 2
Mathematics, 21.06.2019 19:00, phelanpearson3995
The fraction 7/9 is equivalent to a percent that is greater than 100%. truefalse
Answers: 1
Mathematics, 22.06.2019 02:00, brendacauani12345
87.5% , 100% , 83.33 , 93.33% , 100% , 82.5% are all the academic points i've gotten this quarter. what's my final grade?
Answers: 1
Mathematics, 22.06.2019 07:00, nataliastrong3846
Simplify by combining the like terms 3.5y+y+9+1
Answers: 1
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