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The mean time taken to design a house plan by40 architects was found to be20 hours with a standard deviation of3.05 hours. a. Construct a99%
The mean time taken to design a house plan by40
architects was found to be20
hours with a standard deviation of3.05
hours.
a.Construct a99%
confidence interval for the population mean
.
Round your answers to two decimal places.
_____to______hours
b.Suppose the confidence interval obtained in partais too wide. Select all of the ways the width of this interval can be reduced.
-Lowering the confidence level
-Increasing the sample size
-Lowering the sample size
-Increasing the confidence level
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