Basic Business Statistics, Student Value Edition (13th Edition)
Basic Business Statistics, Student Value Edition (13th Edition)
13th Edition
ISBN: 9780321946393
Author: Mark L. Berenson, David M. Levine, Kathryn A. Szabat
Publisher: PEARSON
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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.
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Chapter 7, Problem 7PS

According to a mashable post. time spent on Tumbir, a microblogging platform and social networking website, has a mean of 14 minutes per visit. Assume that time spent on Tumblr per visit is normally distributed and that the standard deviation is 4 minutes. If you select a random sample of 25 visits,

a. what is the probability that the sample mean is between 13.6 and 14.4 minutes?

b. what is the probability that the sample mean is between 13 and 14 minutes?

c. If you select a random sample of 100 visits, what is the probability that the sample mean is between 13.6 and 14.4 minutes?

d. Explain the difference in the results of (a) and (c).

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Chapter 7 Solutions

Basic Business Statistics, Student Value Edition (13th Edition)

Ch. 7 - Given a normal distribution with =100and=10, if...Ch. 7 - Given a normal distribution with =50and=5, if you...Ch. 7 - For each of the following three populations,...Ch. 7 - The following data represent the number of days...Ch. 7 - The diameter of a brand of tennis balls is...Ch. 7 - Prob. 6PSCh. 7 - According to a mashable post. time spent on...Ch. 7 - Today, full-time college students report spending...Ch. 7 - In a random sample of 64 people, 48 are classified...Ch. 7 - A random sample of 50 households was selected for...
Ch. 7 - The following data represent the responses (Y for...Ch. 7 - A political pollster is conducting an analysis of...Ch. 7 - You plan to conduct a marketing experiment in...Ch. 7 - Prob. 14PSCh. 7 - Prob. 15PSCh. 7 - Prob. 16PSCh. 7 - The Chartered Financial Analyst (CFA) institute...Ch. 7 - A Pew Research Center project on the state of news...Ch. 7 - Why is the sample mean an unbiased estimator of...Ch. 7 - Why does the standard error of the mean decrease...Ch. 7 - Why does the sampling distribution of the mean...Ch. 7 - What is the difference between a population...Ch. 7 - Under what circumstances does the sampling...Ch. 7 - An industrial sewing machine uses ball bearings...Ch. 7 - The fill amount of bottles of a soft drinks is...Ch. 7 - Prob. 26PSCh. 7 - In Problem 7.26, suppose that the mean amount of...Ch. 7 - Prob. 28PSCh. 7 - Prob. 29PS
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