Part 3 of 3 (c) If appropriate, construct a 99.5% confidence interval for the mean price for all phones of this type being sold on the Internet in 2013. Round your intermediate step to three decimal places. Round your answer to one decimal place. A 99.5% confidence interval for the mean price for all phones of this type being sold on the Internet in 2013 is VFW $
Part 3 of 3 (c) If appropriate, construct a 99.5% confidence interval for the mean price for all phones of this type being sold on the Internet in 2013. Round your intermediate step to three decimal places. Round your answer to one decimal place. A 99.5% confidence interval for the mean price for all phones of this type being sold on the Internet in 2013 is VFW $
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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I just need help with part 3 please
Transcribed Image Text:How smart is your phone? A random sample of 9 Samsung Galaxy smartphones being sold over the Internet in 2013 had the following prices, in dollars:
329
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Part 1 of 3
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Assume the population standard deviation is o = 86.
Perform the following.
Part 2 of 3
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(a) Explain why it is necessary to check whether the population is approximately normal before constructing a confidence interval.
It is necessary to check whether the population is approximately normal because the sample size is less than or equal to 30
It is
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(b) Following is a dotplot of these data. Is it reasonable to assume that the population is approximately normal?
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Part 2/3
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200
Check
250 300 350
▼ reasonable to assume that the population is approximately normal.
BE
400
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Transcribed Image Text:Part: 2/3
Part 3 of 3
(c) If appropriate, construct a 99.5% confidence interval for the mean price for all phones of this type being sold on the Internet in 2013. Round your
intermediate step to three decimal places. Round your answer to one decimal place.
A 99.5% confidence interval for the mean price for all phones of this type being sold on the Internet in 2013 is
<µ.<
Skip Part
Check
MacBook Air
X
Save For Later
B
000
Submit Assignment
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