test 1 review - Chapter 1 Introduction and Data Collection...

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Chapter 1 – Introduction and Data Collection o Descriptive Statistics Collects, summarizes and presents data o Inferential Statistics Uses sample data to draw conclusions about an entire population o Population All the items or individuals about which you want to draw a conclusion o Parameter Numerical measure that describes a characteristic of a pop. o Sample Portion of a pop. selected for analysis Probability Sample - items in the sample are chosen on the basis of known probabilities Nonprobability Sample -items included are chosen w/o regard to their probability of occurrence o Statistic A numerical measure that describes a characteristic of a sample Chapter 2 – Presenting Data in Tables and Charts o Ratio(highest level of measurement)- w/ true zero. Ex. $0 in bank acct means you really don’t have any money. 0 ft. means nothing is there. Interval(second-highest level of measurement)- w/o true zero. Ex. 0 degrees doesn’t mean there isn’t any temperature. 0 elevation just mean you’re at sea level. o Ordered Array Sequence of data, in rank order, from smallest to largest value o Stem and Leaf Display Organizes data into groups (stems) so that the values within each group (leaves) branch out to the right on each row o Frequency Distribution- summary table in which the data are arranged into numerical ordered class groupings. Width of class interval , divide range of data by # of desired class groupings Class midpoint, halfway between the lower boundary and upper boundary of the class. Ex. Midpoint of $10 and $15 is $12.50 Relative frequency, divide the frequency of class by total frequency distrib. values Percentage distribution, multiply each relative frequency by 100% o Frequency Histogram bar chart for grouped numerical data in which the frequencies or percentages of each group of data are represented as individual vertical bars o Frequency Polygon (used when you have two or more groups of data) Formed by having the midpoint of each class represent the data in that class and then connecting the sequence of midpoints at their respective class percentages. o Ogive (Cumulative Percentage Polygon) Displays the variable of interest along the X axis, and the cumulative percentages along the Y axis o Categorical Data (qualitative, values that can only be places into categories)-DISCRETE
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Ordinal(second-lowest level of measurement)- w/ rank. Ex. Fr. So. Jr. Sr. can be ranked or ordered Nominal(lowest level of measurement)- w/o rank. Ex. Gender, zip codes can’t rank or order o Summary Table Indicates the frequency, amount, or percentage of items in a set of categories so that you can see the differences between the categories o Bar Chart Shows each category, the length of which represents the amount, frequency or percentage of values falling into a category. o
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This note was uploaded on 04/02/2008 for the course MATH 276 taught by Professor Randall during the Fall '07 term at University of Arizona- Tucson.

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test 1 review - Chapter 1 Introduction and Data Collection...

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