159 197 203 206 241 278 285 308 215 215 160 190 198 166
b) Based on the 95% confidence interval (188.9,242.7), can we safely conclude the population mean weight is greater than 196.2? Why?
c) Now, suppose σ is known to be 29 pounds, construct the 95% CI.
d) With σ known, now does it seem possible that the population mean weight is greater than 196.2? Use the results from part C and explain why
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