If appropriate, construct a 95% 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.ANSWER PART 3 How smart is your phone? A random sample of 10 Samsung Galaxysmartphones being sold over the Internet in 2013 had the following prices, indollars:199 169 385 329 269 149135 249 349 299Send data to ExcelAssume the population standard deviation is a-82.Perform the following.Part 1 of 3(a) Explain why it is necessary to check whether the population isapproximately normal before constructing a confidence interval.It is necessary to check whether the population is approximately normalbecause the 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 thatthe population is approximately normal?100 150It isnormal.Part: 2/3Part 3 of 3200 250 300 350reasonable to assume that the population is approximately(c) If appropriate, construct a 95% confidence interval for the mean pricefor all phones of this type being sold on the Internet in 2013. Round yourintermediate step to three decimal places. Round your answer to onedecimal place.A 95% confidence interval for the mean price for allphones of this type being sold on the Internet in 2013is<μ<.

199,169,385,329,269,149,135,249,349,299Part 3:-Confidence level=95%standard deviation()=82sample…

Answered: (c) If appropriate, construct a 95%…

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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If appropriate, construct a 95% 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. ANSWER PART 3

How smart is your phone? A random sample of 10 Samsung Galaxy
smartphones being sold over the Internet in 2013 had the following prices, in
dollars:
199 169 385 329 269 149
135 249 349 299
Send data to Excel
Assume the population standard deviation is a-82.
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
It is
normal.
Part: 2/3
Part 3 of 3
200 250 300 350
reasonable to assume that the population is approximately
(c) If appropriate, construct a 95% 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 95% confidence interval for the mean price for all
phones of this type being sold on the Internet in 2013
is<μ<.

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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