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1. You randomly select 36 restaurants and measure the temperature of coffee sold at each. The...

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Basic Math

1. You randomly select 36 restaurants and measure thetemperature of coffee sold at each. The sample mean temperature is162.0°F. Temperatures historically have had a population standarddeviation of 10.0°F. Which of the following intervals is thecorrect 95% confidence interval for the true mean? (T interval or Zinterval)

2. If all other quantities remain the same, how does theindicated change affect the width of a confidence interval?Decrease the level of confidence from 95% to 90%?

Answer & Explanation Solved by verified expert
3.6 Ratings (643 Votes)
Solution Given thatPoint estimate sample mean 1620Population standard deviation 100Sample size n 361    See Answer
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