Consider,
The mean of the population "\\$6" ,
Standard Deviation "\\$1"
Sample size "27"
Therefore, for a "95\\%" Confidence interval the "Z^*-Value" is "1.96". The population mean cost for a fast food meal will be obtained as below,
"(1.96\\times1)\\div\\sqrt27\\\\\n=0.377 (this\\ is\\ referred\\ to\\ as\\ the\\ margin\\ of\\ error)"
The lower end of the interval is;
"6-0.377=5.62"
The upper end is;
"6+0.377=6.38"
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