The American Restaurant Association collected information on the number of meals eaten outside the home per week by young married couples. A survey of 60 couples showed the sample mean number of meals eaten outside the home was 2.76 meals per week, with a standard deviation of 0.75 meals per week. Construct a 97 percent confidence interval for the population mean.
For Required confidence level of 97 %
We have to find the value of Za/2 so first we have to find a
So, a = 1 - 0.97 = 0.03
And Thus a/2 = 0.015
So from the standard table for conversion Z = 2.17