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Question: a sample of historical 120 months river flow is...

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) A sample of historical 120 months river flow is collected and the following is determined: the sample mean is 430 mls, sample standard deviation is 28 m/s. Determine a confidence interval of 95%. In the class of 300 children surveyed, the sample mean weight was 11.3 kg and the standard deviation was 1.8 kg. Find the 99% confidence interval for this data. 2) In a shop, apples are packed in 2 kg bags. A customer suspects the bags may not contain 2 kg. A sample of 40 bags produces a mean of 1.7 kg and a standard deviation of 0,9 kg. Is there enough evidence to conclude that the bags do not contain 2 kg as stated, at 3) nd the 95% confidence interval of the true mean. What will be the -0.05? Also, fi o 0.01? case at

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