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Take a Test Chioma Okongwu- Google Chrome a Secure | https//www.mathxl.com/Student/Player Test.aspx?testld-1719079608centerwin-yes MAT 107 Index 7732 Quiz: Module 6 - Quiz This Question: 1 pt 80( 18 (12 complete) d the population standard deviation. Use thi infomation to construct the 90% and 95% confidence intervals for the population m an which r val i wide for e mtu eedr kg to construct the confidence intervals A random sample of 45 gas grills has a mean price of 5639 10 Assurme the population standard deviation is $56.40 The 90% confidence interval is (DJD). (Round to one decimal place as needed.) The 95% confidence interval is i (Round to one decimal place as needed.) answer below Which interval is wider? Choose the correct The 90% confidence interval The 95% confidence interval O Click to select your answer(s) 5:53 PM 27/2017

Explanation / Answer

The statistical software output for this problem is:

One sample Z summary confidence interval:
: Mean of population
Standard deviation = 56.4

90% confidence interval results:

95% confidence interval results:

Hence,

90% confidence interval: (625.3, 652.9)

95% confidence interval: (622.6, 655.6)

The 95% confidence interval is wider.

Mean n Sample Mean Std. Err. L. Limit U. Limit 45 639.1 8.4076156 625.2707 652.9293

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