The mean time taken to design a house plan by 37 architects was found to be 21 hours with a standard deviation of 3.90 hours. A. Construct a 90% confidence interval for the poulation mean.  B. Suppose the confidence interval obtained in part a is too wide. Select all of the ways the width of this interval can be reduced. Lowering the sample size Lowering the confidence level Increasing the sample size

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