Question

***WILL GIVE MEDAL AND BECOME FAN***
In a sample of 50 households, the mean number of hours spent on social networking sites during the month of January was 45 hours. In a much larger study, the standard deviation was determined to be 8 hours. Assume the population standard deviation is the same. What is the 95% confidence interval for the mean hours devoted to social networking in January?

Answer 1

Answer choices:
- The 95% confidence interval ranges from 8 to 45 hours.
- The 95% confidence interval ranges from 40.13 to 45.78 hours.
- The 95% confidence interval ranges from 43.87 to 46.13 hours.
- The 95% confidence interval ranges from 42.78 to 47.22 hours.

Answer 2

A is the answer. If you want to study, follow the link- http://assets.openstudy.com/updates/attachments/54188f91e4b0ffbe0b0d1671-nincompoop-1410897070386-peckr.olsenc.devorej.introductiontostatisticsanddataanalysis4ed.brooks2012isbn9780840054906co950s_mvsa_dragged.pdf

Answer 3

Thanks! Mind helping with another?

Answer 4

Sure

Answer 5

I mean- here to help!

Answer 6

Two studies were completed in Georgia. One study in northern Georgia involved 3,000 patients; 84% of them experienced flulike symptoms during the month of December. The other study, in southern Georgia, involved 2,000 patients; 75% of them experienced flulike symptoms during the same month. Which study has the smallest margin of error for a 99% confidence interval?

Answer choices:
- The northern Georgia study with a margin of error of 2.5%.
- The southern Georgia study with a margin of error of 2.5%.
- The northern Georgia study with a margin of error of 1.7%.
- The southern Georgia study with a margin of error of 1.7%.

Answer 7

@Kash_TheSmartGuy

Answer 8

@Owlcoffee

Answer 9

@jagr2713

Answer 10

Aiming towards answer choice C.