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numdesc_127s08_bw_p1

# numdesc_127s08_bw_p1 - Stat-Bus 127 Numerical Descriptive...

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Stat-Bus 127 Numerical Descriptive Measures Dr. Linda M. Penas Spring 2008 1 Statistical Methods (p. 13) Defn : Statistics : the branch of science dealing with the collection, organization, presentation, and summarization of data to make decisions, solve problems, and design products and processes. OBJECTIVE : Make inferences about a population based upon information in a sample. Potential Questions Statistical methods may be employed to bring new insight to a problem and answer questions such as: Potential Questions GLOBAL WARMING: ¾ What are the effects of global warming on the polar bear? (and all of us) Potential Questions ¾ Do right-handed people live longer, on the average,then left-handed people? Potential Questions ¾ What are the most popular television shows? 1 v s 0 NUMB3RS Potential Questions ¾ How can a manufacturer provide a better product at a lower price to the consumer? Have you looked at the price of gas in Southern California?????

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Stat-Bus 127 Numerical Descriptive Measures Dr. Linda M. Penas Spring 2008 2 Some Definitions (p. 13) Data : numerical facts and figures Types of Data Qualitative data : data that may be categorized (or coded); represents qualities or attributes EXAMPLE : class standing, eye color, gender, college major Some Definitions (p. 13) Quantitative data : Measurements that represent quantities (``how much", ``how long", ``how many") Discrete data : data measured on a discrete scale; integer data Continuous data : data measured on a continuous scale; not required to be integer-valued Some Definitions (p. 14) Variable : quantity that changes or varies over time and/or for different objects under consideration. Types of Variables Quantitative variable : variable which is measureable. EXAMPLE : height, weight, distance Some Definitions Qualitative variable : variable which is nonmeasureable or categorical. EXAMPLE : eye color, gender, class standing Random variable : variable whose values are the result of chance. Let’s look at the types of rvs. . . Some Definitions Discrete random variable : variable which is integer-valued. (often a counting variable) EXAMPLE : Roll a die. The value on the face is an integer: 1,2,3,4,5,6
Stat-Bus 127 Numerical Descriptive Measures Dr. Linda M. Penas Spring 2008 3 EXAMPLES ¾ # of defective flash drives in a shipment of 200 flash drives ¾ # of people having a bad reaction to a new flu vaccine Some Definitions Continuous random variable : variable which is real number-valued. (doesn’t have to be an integer; measured on a continuous scale) EXAMPLE : Computer down time EXAMPLES ¾ mileage obtained by a new hybrid car ¾ waiting time in a veterinarian's office More Definitions????

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numdesc_127s08_bw_p1 - Stat-Bus 127 Numerical Descriptive...

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