QM 215 chapter 9

Body of methods dealing with the correction description analysis and interpretation of data

the use of tables graphs and numerical measures to display data

use of sample information to learn about a population

a portion of a population, chosen by means of a simple random sample

• selected in such a way that every item in the sample population has an
• equal opportunity to be included

the total set or group of items about which information is desired

Measures the entire population

• variable who’s values are numbers, that result from a count or a
• Measurement

Values are categories or classifications, and usually expressed in words

hold out a certain value and test (could the population proportion be .60)

one of the two forms of estimation. A prediction/estimate of a population value, for example the population proportion or the population mean, that consists of the range of values and the level of confidence which is the probability that that the interval encompasses or contains the population value

estimates the value of a population parameter