Section 7.4 Confidence Intervals (CI) - Population Mean (µ) when ? is Unknown
3. The mean waking body temperature of nine healthy adults is 97.2 °F with standard deviation of 0.32°.
Construct a 99% confidence interval for the mean waking adult body temperature.
Lower Limit:
Upper Limit:
Interval:
4. The mean monthly credit card balance for 50 randomly selected customers is $4,500 with a standard deviation
of $975. Construct a 90% confidence interval for the mean monthly credit card balance.
Lower Limit:
Upper Limit:
Interval:
©2017 Mathematical Expressions, All Rights Reserved