Chapter Two: The Language of Statistics
Population everything you wish to study Variable used to represent a characteristic of each member of the population Sample piece of the population Why pick a sample? It would take too much time to study the
Chapter One: The Role of Statistical Thinking in Management Four issues must be addressed if statistics is to become an integral part of management: Managers must understand why they need to possess statistical knowledge. Current and future managers
HW2: Due 9/30/16
Exhibit 5-7
A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given
the following sample information.
Cups of Coffee
Frequency
0
700
1
900
2
600
3
300
2,500
1. Refer to Exhibit 5-7. The expected
HW2: Due 9/30/16
Exhibit 5-7
A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given
the following sample information.
Cups of Coffee
Frequency
0
700
1
900
2
600
3
300
2,500
1. Refer to Exhibit 5-7. The expected
UU Building Manager Report
3/24/2017
Name:
Chiedozie Obi
Time of Shift: 1:00 PM- 8:30 PM
Time
1:00 PM
2:00 PM
3:00 PM
4:00 PM
5:00 PM
6:00 PM
7:00 PM
8:00 PM
Update
Union was pretty quiet. The only people that were here were the
ABM workers.
Nothing was h
UU Building Manager Report
3/29/2017
Name:
Chiedozie Obi
Time of Shift: 8:00 PM- 2:30 AM
Time
8:00 PM
9:00 PM
10:00 PM
11:00 PM
12:00 AM
1:00 AM
2:00 AM
Update
There were a lot of people in the union. Mainly outside of
Susquehanna.
One student came for ke
UU Building Manager Report
4/06/2017
Name:
Chiedozie Obi
Time of Shift: 6:00 PM- 12:30 AM
Time
6:00 PM
10:00 PM
Update
There were two different events going on in the union. One in Ptux
another in Loch Raven. People would frequently ask where the
location
UU Building Manager Report
4/12/2017
Name:
Chiedozie Obi
Time of Shift: 8:00 PM- 2:30 AM
Time
8:00 PM
9:00 PM
10:00 PM
11:00 PM
12:00 AM
1:00 AM
2:00 AM
Update
There were a lot of people in the union. Mainly outside of
Susquehanna.
One student came for ke
UU Building Manager Report
4/08/2017
Name:
Chiedozie Obi
Time of Shift: 1:00 PM- 6:00 PM
Time
1:00 PM
5:00 PM
Update
There were a lot of people in the union. Mainly outside of
Susquehanna. Many tours going on.
I did rounds to see how populated we were.
On
UU Building Manager Report
4/08/2017
Name:
Chiedozie Obi
Time of Shift: 1:00 PM- 6:00 PM
Time
1:00 PM
5:00 PM
Update
There were a lot of people in the union. Mainly outside of
Susquehanna. Many tours going on.
I did rounds to see how populated we were.
On
UU Building Manager Report
3/1/2017
Name:
Chiedozie Obi
Time of Shift: 8:00 PM- 2:30 AM
Time
8:00 PM
9:00 PM
10:00 PM
11:00 PM
12:00 AM
1:00 AM
2:00 AM
Update
People are still pretty prevalent in the union. There are no real
disturbances. One person came
UU Building Manager Report
3/16/2017
Name:
Chiedozie Obi
Time of Shift: 8:00 PM- 2:30 AM
Time
8:00 PM
9:00 PM
10:00 PM
11:00 PM
12:00 AM
1:00 AM
2:00 AM
Update
People are still pretty prevalent in the union. There are no real
disturbances.
Nobody came for
UU Building Manager Report
4/06/2017
Name:
Chiedozie Obi
Time of Shift: 8:00 PM- 2:30 AM
Time
8:00 PM
9:00 PM
10:00 PM
11:00 PM
12:00 AM
1:00 AM
2:00 AM
Update
There were a lot of people in the union. Mainly outside of
Susquehanna.
One ABM worker turned i
UU Building Manager Report
3/1/2017
Name:
Chiedozie Obi
Time of Shift: 8:00 PM- 2:30 AM
Time
8:00 PM
9:00 PM
10:00 PM
11:00 PM
12:00 AM
1:00 AM
2:00 AM
Update
People are still pretty prevalent in the union. There are no real
disturbances. One person came
UU Building Manager Report
4/19/2017
Name:
Chiedozie Obi
Time of Shift: 8:00 PM- 2:30 AM
Time
8:00 PM
9:00 PM
10:00 PM
11:00 PM
12:00 AM
1:00 AM
2:00 AM
Update
TUPD were contacted for the missing wallet. The girl called and said
that she would claim it to
9-24-07 Population Mean x n s2 = (xi i=1 n-1 )2 x .
Alternative Way of Calculating s2
=
nx2i (xi) 2 n(n-1)
Population Variance - 2 2 = (xi ) N Exercise 4.10 2 =
9-26-07 Z-Score measures the # of standard deviations a data value is from the mean
Percentiles The pth percentile of a data set is the value that has p percent at or below it. P=b+(1/2)e H B= # of data values below the value of interest E= # of da
8/29/07 Chapter 1 What managers need to know about statistics? How to present & manage data. Draw conclusions about a population based on a sample. How to improve processes. How to obtain a reliable forecast. Model mathematical relation between
Standard Normal Tables An internal probability distribution gives probability that random variable, X, will be between to given values. P(x1 < X < x2) P(Z < z) . z will take on some value less than z P(z1 < Z < z2) = P(Z < z2) P(Z<z) Steps in Solvin
9/5/07 Biased Sample sample that does not fairly represent population Selecting a Random Sample all members of population have equal chance of getting picked The Sampling Frame list of members of population Ways of Selecting Random Sample: Table
9-19-07 The Median have to organize numbers in increasing order 1,5,2,4,8}Organize {1,2,45,8 Extreme Values Average is affected by extreme values. (90, 40, 100) Odd or Even Data with Mean Odd (n) the median is n+1/2 Even (n) the median is the av
_ Distribution of the Sample Mean X: The central Limit Theorem = 55g should be close to The size of every sample is n=5 Take a sample at 11th hour The size of every sample is N=5 _ X = 54g Is there a sampling error? Manufacturing problem? The Z scor
11-12-07 Hypothesis Testing Suppose a fabric manufacturer has received many complaints about the toughness of the material. 1000 MD strength. Suppose you take a sample and find 1010 MD strength. A second sample yields XBAR = 995 We ned to test a hypo
Large Sample Confidence Interval for the Mean = 55g Weight of Diaper n = 30 _ x = 54.98 Must fix interval of confidence. 90% or 95% We are 95% confident that value will be found in interval. Example: we would like to be able to say that based on th
9-17-07 Pareto Analysis Principal of vital few or trivial many. 80-20 Rule Pareto Diagram categories plotted in order of decreasing frequencies Histogram for Integer Data Describing and Comparing Data: o Quantitative: Center Shape Variability Cha
Chapter 3: Graphical Displays of Data
Raw Data - initial list of the observations for each variable Frequency Table table containing each category value, or class of values that a variable might have and the number of times each one occurs in the da
Chapter Four: Numerical Descriptors of Data Numerical measures calculated from data are either statistics or data. o Statistic numerical descriptor that is calculated from sample data and is used to describe the sample. Statistics are usually repres
Chapter 5: Analyzing Bivariate Data Qualitative Bivariate Data Bivariate Data data for two variables. Summarizing Two Qualitative Variables o Contingency Table a table whose rows represent the possible values of one variable and whose columns repre
Chapter 6: Probability Basic Rules of Probability Probability measure of how likely it is that something will occur Experiment any action whose outcomes are recordable data. Sample Space S, set of all possible outcomes of an experiment Could have
Chapter 7: Sampling Distributions and Confidence Intervals
Control Chart looks at variation in data from samples of products taken over time. _ Sample Mean X Motivation for Point Estimators Point Estimate Single number calculated from sample data.
UU Building Manager Report
4/08/2017
Name:
Chiedozie Obi
Time of Shift: 8:00 PM- 2:30 AM
Time
8:00 PM
9:00 PM
10:00 PM
11:00 PM
12:00 AM
1:00 AM
2:00 AM
Update
There were a lot of people in the union. Mainly outside of
Susquehanna.
I did constant rounds u