ation standard deviation is = 82. wing. y it is necessary to check whether the population is approximately normal before constructing a confidence interval. to check whether the population is approximately normal because ze is less than or equal to 30 X

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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How smart is your phone? A random sample of 8 Samsung Galaxy smartphones being sold over the Internet in 2013 had the following prices, in dollars:
169 385 329 269 149 135
249 349
Sand data to Excel
Assume the population standard deviation is = 82.
Perform the following.
Part: 0 / 3
Part 1 of 3
(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
Part: 1/3
Part 2 of 3
(b) Following is a dotplot of these data. Is it reasonable to assume that the population is approximately normal?
100 150 200
It is
Part: 2/3
..
250
300 350 400
reasonable to assume that the population is approximately normal.
X
Part 3 of 3
(c) If appropriate, construct a 90% 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 90% confidence interval for the mean price for all phones of this type being sold on the Internet in 2013 is
X
3
Transcribed Image Text:How smart is your phone? A random sample of 8 Samsung Galaxy smartphones being sold over the Internet in 2013 had the following prices, in dollars: 169 385 329 269 149 135 249 349 Sand data to Excel Assume the population standard deviation is = 82. Perform the following. Part: 0 / 3 Part 1 of 3 (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 Part: 1/3 Part 2 of 3 (b) Following is a dotplot of these data. Is it reasonable to assume that the population is approximately normal? 100 150 200 It is Part: 2/3 .. 250 300 350 400 reasonable to assume that the population is approximately normal. X Part 3 of 3 (c) If appropriate, construct a 90% 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 90% confidence interval for the mean price for all phones of this type being sold on the Internet in 2013 is X 3
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