W 4. A cell phone company claims that the average time a person spends on their phone is 12.8 hours a week. A sample of unknown size of phone users was selected, and the mean time they spent on their phones was 12.2 hours in a week, with a standard deviation of 2.3 hours. Using a 90% confidence level, how many people would the company have to sample in order for their hypothesis to be true?
W 4. A cell phone company claims that the average time a person spends on their phone is 12.8 hours a week. A sample of unknown size of phone users was selected, and the mean time they spent on their phones was 12.2 hours in a week, with a standard deviation of 2.3 hours. Using a 90% confidence level, how many people would the company have to sample in order for their hypothesis to be true?
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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4. A cell phone company claims that the average time a person spends on their phone is 12.8 hours a
week. A sample of unknown size of phone users was selected, and the mean time they spent on
their phones was 12.2 hours in a week, with a standard deviation of 2.3 hours. Using a 90%
confidence level, how many people would the company have to sample in order for their hypothesis
to be true?
Transcribed Image Text:500
50
300
30
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