12. Bart aims to estimate the mean value of body weight in Springfield citizens. He asks 30 citizens of Springfield about their body weight and gets a mean value of 75 kg with a standard deviation of 15 kg. Please calculate the confidence interval on the 95% level for the estimated true population mean

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Explain please!! It's for the mock exam, i already have the anwers but I need the procedure (it's not for the real exam, it's for the practice exam)

12. Bart aims to estimate the mean value of body weight in Springfield citizens. He asks 30 citizens of Springfield about
their body weight and gets a mean value of 75 kg with a standard deviation of 15 kg. Please calculate the confidence
interval on the 95% level for the estimated true population mean
Transcribed Image Text:12. Bart aims to estimate the mean value of body weight in Springfield citizens. He asks 30 citizens of Springfield about their body weight and gets a mean value of 75 kg with a standard deviation of 15 kg. Please calculate the confidence interval on the 95% level for the estimated true population mean
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