QBA 2302 Assignment #9
The office manager for a large company is studying the usage of its copying
machines. A random sample of six copy machines revealed the following number of
copies made in a day.
Data
1126
1011
1101
Descriptive statistics
count
mean

Answers, Class Example #8
I.
(a) A point estimate for the unknown process mean would be the sample mean
equal to 311 days.
(b) SE ( X ) =
12
= 2 days
36
(c) Margin of Error = Z SE ( X ) = 1.96 ( 2) = 3.92 days
(d) 95% Confidence Interval Estimate for the

Chapter 5 Statistical Estimation Confidence
Intervals
Introduction
This chapter uses the concepts from Chapter 4 to use sample data to provide a guess for a range of
numbers that will include with a high chance the value of an unknown population parameter

Chapter 4 Sampling and Sampling
Distributions
Introduction
This chapter introduces how you can use data from a sample to draw conclusions about
the larger population from which the sample was taken. Data often arises from the
results of a survey of indivi

Chapter 3
Risk Analysis - Probability
Business decisions often involve choosing from several alternatives. In order to make a
decision among several alternatives, one must be able to estimate the consequences of each
alternative. The consequences often de

Chapter 2
Describing Data Numerical Summaries
In addition to tables and charts, data can also be summarized through numerical
calculations. The original data can be replaced with a few key measures that attempt to
explain a set of data. For quantitative v

Chapter 1
Summarizing Data Tables and Charts
Introduction
Business statistics (Quantitative Business Analysis (QBA) at Baylor) involves the
collection and summarizing of data such that the summaries can be used in a decision
making process. The summaries

Assignment 7 Part 1
(a)
(b)
(c)
(d)
(e)
(f)
Parameter
Statistic
statistic; parameter
Constant
Variable
The possible values of the sample means would be approximately bell-shaped
(normally distributed) centering around the process (population) mean. The
Ce

QBA 2302 Assignment #8
Estimation and Confidence Interval for a Population Mean
Problems 1-6 require the following information: The Evergreen Company operates retail pharmacies in
10 eastern states. Recently the companys internal audit department selected

Assignment 7 Part 1
(a)
(b)
(c)
(d)
(e)
(f)
Parameter
Statistic
statistic; parameter
(g)
SE ( X ) =
The possible values of the sample means would be approximately bell-shaped
(normally distributed) centering around the process (population) mean. The
Centr