# Statistics Chapter 1,2,3,4

 The flashcards below were created by user trulyfe89 on FreezingBlue Flashcards. The two major types of statistics are ______ statistics and _____ statistics. Inferential, Descriptive What is the difference in the conclusion drawn from a designed experiment an observational study? Oberservational can only reveal association, where designed experiments can show causation Describe advantages and disadvantages of cluster sampling. Advantages: Easier, faster, less expensiveDisadvantage: cluster sampling is not that accurate, each cluster will probably not be the same as the other clusters Age Percentage not covered 18-24 28.2 25-39 24.9 40-54 19.1 55-65 16.5 Classify the study as either descriptive or inferential Inferential Define Observational Study researchers observe characteristics and take measurements Define Designed experiment researchers impose treatments and controls Descriptive Statistics consists of methods for organizing and summarizing information inferential statistics consists of methods for drawing and measuring the reliability of conclusions about a population based on info obtained from a sample of the population Contingency table represent what specific kind of discrete data bivariate data what is the equation for Chebyshev's Rule 100(1-(1/k2) % How many data points are you trimming off for 20 data points with a 10% trimmed mean? 4 in total...2 on top and 2 on the bottom Qualitative variable nonnumerical variable Quantitative variable numerical variable variable characteristic that varies from one person or thing to another data values of a variable qualitative data values of a qualitative variable quantitative data values of a quantitative variable discrete variable quantitative variable whose possible values can be listed continuous variable quantitative variable whose possible values form some interval of numbers a table that provides the classes, frequencies, relative frequencies, and midpoints of a data is called a _______ grouped-data table A positive Z score indicates that the observation is ______ the mean, whereas a negative Z score indicates that the observation is _____ the mean. above, below A standardized variable always has mean ____ and standard deviation ____ 0, 1 interpret this z score. Z = 10.16 - 3.00 = 2.24 3.20 the data 10.16 is 2.24 standard deviation above the mean of 3.00 difference between a parameter and a statistic a parameter is a measure of the population and a statistic is a measure of a sample mutually exclusive events no two of them have outcomes in common Authortrulyfe89 ID36331 Card SetStatistics Chapter 1,2,3,4 DescriptionMath exam 1 Updated2010-09-21T19:16:47Z Show Answers