How smart is your phone? A random sample of 9 Samsung Galaxy smartphones being sold over the Internet in 2013 had thefollowing prices, in dollars:199 169385329269149135 249 349Send datato ExceloloAssume the population standard deviation is o = 86.Perform the following.Part 1 of 3(a) Explain why it is necessary to check whether the population is approximately normal before constructing a confidenceinterval.It is necessary to check whether the population is approximately normal becausethe sample size is less than or equal to 30Part 2 of 3(b) Following is a dotplot of these data. Is it reasonable to assume that the population is approximately normal?.......100150200250300350400It isv reasonable to assume that the population is approximately normal.Part: 2 / 3Part 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 theInternet 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 theInternet in 2013 is < u <|:

(a) When the sample size is small(less than or equal to 30) it is necessary to check the population…

(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 isO

(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 isO

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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Concept explainers

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.

Question

100%

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:
199 169
385
329
269
149
135 249 349
Send data
to Excel
olo
Assume the population standard deviation is o = 86.
Perform the following.
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 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
250
300
350
400
It is
v reasonable to assume that the population is approximately normal.
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 < u <|:

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