Confidence interval of single mean and proportion An avocado farmer took a sample of 135 two-year old trees to procure information on their growth rate. The sample produced a mean of 0.988 metres. It is known that the standard deviation of the height of such trees is 0.028. Construct a 95% confidence interval for the mean height of all such trees. n= 135 = 0.988 = 0.028

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