A researcher has gathered information froma random sample of 178 households. For each ofthe following variables, construct confidence intervals to estimate the population mean. Use the90% level.a. An average of 2.3 people resides in eachhousehold. Standard deviation is 0.35.b. There was an average of 2.1 television sets(s
0.10) and 0.78 telephones (s
0.55) perhousehold.c. The households averaged 6.0 hours of television viewing per day (s
3.0)

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A: