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1 a sample of historical 110 months river flow is...

Question: 1 a sample of historical 110 months river flow is...

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1) A sample of historical 110 months river flow is collected and the following is determined: the sample mean is 340 m/s, sample standard deviation is 25 m/s. Determine a confidence interval of 95%. In the class of 200 children surveyed, the sample mean weight was 22.3 kg and the standard deviation was 3.8 kg. Find the 99% confidence interval for this data. 2) 3) In a shop, apples are packed in 3 kg bags. A customer suspects the bags may not contain 3 kg. A sample of 40 bags produces a mean of 2.7 kg and a standard deviation of 0.7 kg. Is there enough evidence to conclude that the bags do not contain 3 kg as stated, at α= 0.05? Also, find the 95% confidence interval of the true mean, what will be the case at o 0.01?

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