Post on 04-Jul-2015
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Week 1 Lecture
MA 221
Statistics for Decision MakingProfessor Brent Heard
Not to be copied or linked to without my permission
Week 1 Lecture MA 221
• Week 1 (Homework and Graded DB)
• Week 2 (Homework, Graded DB and Lab)
• Week 3 (Homework, Graded DB and Quiz)
• Week 4 (Homework, Graded DB and Lab)
• Week 5 (Homework, Graded DB and Quiz)
• Week 6 (Homework, Graded DB and Lab)
• Week 7 (Homework, Graded DB and Quiz)
• Week 8 (Final Exam)
Week 1 Lecture MA 221
• Determine whether the data set is a population or a sample. Explain your reasoning.
The salaries of each teacher in a high school.
Week 1 Lecture MA 221
• Determine whether the bold value is a parameter or a statistic.
In a statewide survey on candy consumption, 72.7% of respondents between the ages of 40 and 49 reported M&M’s as a favorite candy.
Week 1 Lecture MA 221
• Determine whether the bold value is a parameter or a statistic.
In a study of all teachers in a particular high school, 98% own a cell phone.
Week 1 Lecture MA 221
• Determine whether the variable is qualitative or quantitative.
Enrollment of an elementary school.
Week 1 Lecture MA 221
• Determine whether the variable is qualitative or quantitative.
Colors of cars in the parking lot of an office building.
Week 1 Lecture MA 221
• Determine whether the variable is qualitative or quantitative.
Zip Codes of the students in your online class.
Week 1 Lecture MA 221
• What is the data set’s level of measurement?
Colors of cars in the parking lot of an office building.
Week 1 Lecture MA 221
• What is the data set’s level of measurement?
Daily low temperatures in Fahrenheit for December 2011.
Week 1 Lecture MA 221
• What is the data set’s level of measurement?
Number of dogs each of your classmates have at home.
Week 1 Lecture MA 221
• What is the data set’s level of measurement?
College Football Rankings.
Week 1 Lecture MA 221
• Which method of data collection is described?
Asking every fifth student in line to enroll what they are planning on majoring in.
Week 1 Lecture MA 221
• Which method of data collection is described?
Looking at all 20 entry level statistics classes at a university and survey 2 students from each class.
Week 1 Lecture MA 221
• Which method of data collection is described?
Looking at all 20 entry level statistics classes at a university and surveying everyone in one of the classes chosen at random.
Week 1 Lecture MA 221
• Which method of data collection is described?
Standing outside the local shopping mall and asking people what they think of the new mall 15 miles away.
Week 1 Lecture MA 221
• Which method of data collection is described?
Putting all of the first grade students names in a hat and drawing one to get to sit next to the teacher at lunch.
Week 1 Lecture MA 221
• Describe whether you would take a census or use a sampling to collect data for the study described below.
The average salary of the 75 workers at a small business.
Week 1 Lecture MA 221
• Describe whether you would take a census or use a sampling to collect data for the study described below.
The average number of times per year the citizens of a 250,000 population city use the library.
Week 1 Lecture MA 221
• For the Data:
56 74 84 98 88 77 79 74 80 91
The stem and leaf would be:
5| 6
6|
7| 4479
8| 048
9| 18
Skewness
“Tail” to the Left “Tail” to the Right
Think of a “Bell”Or PerfectMountain
Think of a “Block of wood”
Week 1 Lecture MA 221
Week 1 Lecture MA 221
• Find the mean, median and mode for the following set of data representing the number of children a sample of 10 families have living at home. Explain what each measure of center is in plain language.
2 2 3 1 0 3 0 1 0 2
Week 1 Lecture MA 221
• Find the range, mean, standard deviation for the following set of data representing the number of children a sample of 12 families have living at home. Know what the terms mean.
2 2 3 1 0 3 0 1 0 2 4 3
Week 1 Lecture MA 221
• Average sales per customer at a Fast Food Restaurant have a bell-shaped distribution with a mean of $5.37 and standard deviation of 78 cents. Using the empirical rule, give the following intervals.
• 68% of the values would fall between what two values ( 5.37 - .78, 5.37+ .78)
• 95% of the values would fall between what two values ( 5.37 - 2(.78), 5.37+ 2(.78))
• 99.7% of the values would fall between what two values ( 5.37 – 3(.78)), 5.37+ 3(.78))
Week 1 Lecture MA 221
• Explain all of the values associated with a box and whisker plot and what they mean.
Min
Max
Median1st Quartile 3rd Quartile
Week 1 Lecture MA 221
• Explain what a z score of zero would mean. Then explain the difference between a positive and a negative z score.
About MeI have worked in the NASA world since completing my graduate degree in 1987.
I earned both my M.S. and B.S. in Mathematics from Jacksonville State University in Jacksonville, Alabama. I did Post Graduate work in Mathematics and Engineering Management at the University of Alabama, Huntsville.
My teaching experience has included a number of colleges in Alabama and Virginia, as well as many years with DeVry. I am the live lecturer for all undergraduate and graduate statistics classes at DeVry.
In my spare time I enjoy writing. My genre is observational humor. In other words, I just enjoy finding humor in the world and making people laugh. My stories can be found in newspapers and at www.CranksMyTractor.com .
Week 1 Lecture MA 221
• In the next couple of days, I will post these online at my “Statcave” site on Facebook.
• You DO NOT have to be a Facebook person to see these, I simply post them there for convenience.
• Website: www.facebook.com/statcave