Normal population mean
Normal population std dev
Sample n
Mean of sample means by CLTh
Std deviation of sample means by CLTh
0
1
(Put value)
(Put value)
(Compute value)
Sample mean mean
Sample mean s
=average of row 10
=STDEV of row 10
Sample means
Sample

Ch7 Problems
Problem 3
The Statistical Abstract of the United States published by the U.S. Census Bureau reports
that the average annual consumption of fresh fruit per person is 99.9 pounds. The
standard deviation of fresh fruit consumption is about 30 po

Ch6 Problems
Problem 1
The U.S. Bureau of Labor Statistics reports that the average annual salary in the
metropolitan Boston area is $45,121. Suppose annual salaries in the
metropolitan Boston area are normally distributed, with a standard deviation of
$4

Ch5 Problems
Problem 5
According to a recent survey, the probability that a passenger files a complaint with the
Department of Transportation about a particular U.S. airline is 0.000014.
Suppose 100,000 passengers who flew with this particular airline are

Ch5 Problems
Problem 2
In a study by Peter D. Hart Research Associates for the NASDAQ Stock Market, it was
determined that 20% of all stock investors are retired people. In addition, 40% of all U.S.
adults invest in mutual funds.
a. Suppose a random sampl

Ch6 Problems
Problem 3
According to the Air Transport Association of America, the average operating cost of an
MD-80 jet airliner is $2,087 dollars per hour. Suppose the operating costs of an MD-80
jet airliner are normally distributed with a standard dev

Chapter 8 Problems
Problem 6
The Interstate Conference of Employment Security Agencies says the average
workweek in the United States is down to only 35 hours, largely because of a rise
in part-time workers. Suppose this figure was obtained from a random

Ch8 Problems
Problem 3
A community health association is interested in estimating the average number of
maternity days women stay in the local hospital. A random sample is taken of 36
women who had babies in the hospital during the past year.
The followin

Ch5 Problems
Problem 4
The National Center for Health Statistics reports that 25% of all Americans between the
ages of 65 and 74 have a chronic heart condition.
Suppose you live in a state where the environment is conducive to good health and low
stress.

Chapter 7: Sampling and Sampling Distributions
1
Sampling and Sampling Distributions
LECTURE OVERVIEW
Virtually every analysis discussed in this course deals with sample data. It is
important, therefore, that you are exposed to the ways and means that sam

Ch5 Problems
Problem 3
Suppose that, for every lot of 100 computer chips a company produces, an average of
1.4 are defective. Another company buys many lots of these chips at a time, from which
one lot is selected randomly and tested for defects.
If the t

Ch8 Problems
Problem 1
A candy company fills a package of Halloween candy with individually wrapped pieces
of candy. The number of pieces of candy per package varies because the package is
sold by weight. The company wants to estimate the number of pieces

In this lecture we will begin using samples to make
inferences about single populations.
Page 1
There are a number of primary objectives in this lecture. First we will
differentiate between point and interval estimations. We will then
compute interval est

Introduction to Chapter 8
Statistical Inference: Estimation for Single Populations
Now we have finally reached the point at which we can do inferential statistics, which are essential to a
great many business, technical, and scientific endeavors. Estimati

In the last lecture we discussed discrete distributions and only briefly introduced
continuous distributions. The introductory pdf document for Chapter 6 introduces
the general topic as well as the uniform distribution, and the remainder of this ppt
focus

Further Comments on Ch 5 discrete distributions - understanding the reasoning behind them
Binomial Distributions
The textbook has a discussion similar to the one I give below, but it does not use the tree concept and is
vague about some of the other conce

Ch8 Problems
Problem 4
According to Runzheimer International, the average cost of a domestic trip for business
travelers in the financial industry is $1,250. Suppose another travel industry research
company takes a random sample of 22 business travelers i

Ch7 Problems
Problem 1
For each of the following research projects, list three variables for stratification of
the sample.
a. A nationwide study of motels and hotels is being conducted. An attempt
will be made to determine the extent of the availability o

Ch8 Problems
Problem 2
A small lawnmower company produced 1500 lawnmowers in 1990. In an effort to
determine how maintenance free the units were, the company decided to conduct a
multi-year study of the 1990 lawnmowers.
A sample of 200 owners of these law

Ch7 Problems
Problem 2
If every eleventh item is systematically sampled to produce a sample size of 75
items, approximately how large is the population?
Page 1 of 2
Solution 2
Use formula for systematic sampling:
K
N
n
Where K = size of selection interval

Ch7 Problems
Problem 4
In an effort to cut costs and improve profits, many U.S. companies have been turning to
outsourcing. In fact, according to purchasing magazine, 54% of companies surveyed
outsourced some part of their manufacturing process in the pas

Ch8 Problems
Problem 5
Suppose a random sample of 85 items has been taken from a population and 40 of the
items contain the characteristic of interest. Use this information to:
a. Calculate a 90% confidence interval to estimate the proportion of the popul

"Hands on" Problem 1 Ch 5
A Hypergeometric Problem
(5.32 with shortened words)- A company ships 16 computers, 4 of which have
defective wiring. The purchaser selects at random 3 computers out of the 16 to test
thoroughly. What is the probability that they

Computer Assignment 1 (for chapters 2 and 3)
Statistics Fall 2016
F D Singleton
Use of Microsoft Excel to-Organize data
-Compute measures of central tendency and variability
-Do frequency analyses and histograms
Introduction -Microsoft Excel has included

Singleton - Computer Assignment 2
- Random Numbers, Sampling and Central Limit Theorem (refers to Ch 7 & 8)
Discussion - The Random Number Generator
Random number generation by computer allows computer simulation of random experiments. The Excel
random nu

Ch4 Problems
Problem 2
A small company has 20 employees. Six of these employees will be selected randomly
to be interviewed as part of an employee satisfaction program. How many different
groups of six can be selected?
DSCI 5031: Ch4 Problem 2
Page 1 of 2

Ch4 Problems
Problem 3
According to the U.S. Bureau of Labor Statistics, 75% of the women 25 through 49
years of age participate in the labor force. 78% of women in this group are married.
Suppose also that 61% of all women 25 through 49 years of age are