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%?
