The mean time taken to design a house plan by 38 architects was found to be 17 hours with a standard deviation of 3.30 hours. a. Construct a 95% confidence interval for the population mean u. Round your answers to two decimal places. to hours 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. O Increasing the confidence level Lowering the sample size Increasing the sample size O Lowering the confidence level

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Chapter 08, Section 8.3, Problem 044
The mean time taken to design a house plan by 38 architects was found to be 17 hours with a standard deviation of 3.30 hours.
a. Construct a 95% confidence interval for the population mean u.
Round your answers to two decimal places.
to
hours
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.
Increasing the confidence level
O Lowering the sample size
n
Increasing the sample size
on
O Lowering the confidence level
ion
zion
| Privacy Policy I © 2000-2020 John Wiley & Sons, Inc. All Rights Reserved. A Division of John Wiley & Sons, Inc.
MacBook Air
Transcribed Image Text:FULL SCREEN Chapter 08, Section 8.3, Problem 044 The mean time taken to design a house plan by 38 architects was found to be 17 hours with a standard deviation of 3.30 hours. a. Construct a 95% confidence interval for the population mean u. Round your answers to two decimal places. to hours 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. Increasing the confidence level O Lowering the sample size n Increasing the sample size on O Lowering the confidence level ion zion | Privacy Policy I © 2000-2020 John Wiley & Sons, Inc. All Rights Reserved. A Division of John Wiley & Sons, Inc. MacBook Air
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