1 According to eMarketer.com, 36% of mobilephone users in the United States use theSnapchat app at least once a month (March2017). A sample of 125 was selected.a. Calculate the standard error of theproportion (round standard error to 4 decimalplaces).b. What is the probability that less than 30% ofmobile phone users used Snapchat?c. What is the probability that between 28% and40% of mobile phone users used Snapchat?d. What impact would changing the sample siİzeto 225 Snapchat users have on the results ofparts a, b, and c?

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1 According to eMarketer.com, 36% of mobile phone users in the United States use the Snapchat app at least once a month (March 2017). A sample of 125 was selected. a. Calculate the standard error of the proportion (round standard error to 4 decimal places),

1 According to eMarketer.com, 36% of mobile phone users in the United States use the Snapchat app at least once a month (March 2017). A sample of 125 was selected. a. Calculate the standard error of the proportion (round standard error to 4 decimal places),

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

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

Question

1 According to eMarketer.com, 36% of mobile
phone users in the United States use the
Snapchat app at least once a month (March
2017). A sample of 125 was selected.
a. Calculate the standard error of the
proportion (round standard error to 4 decimal
places).
b. What is the probability that less than 30% of
mobile phone users used Snapchat?
c. What is the probability that between 28% and
40% of mobile phone users used Snapchat?
d. What impact would changing the sample siİze
to 225 Snapchat users have on the results of
parts a, b, and c?

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