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Unformatted text preview: Click to edit Master subtitle style M342 Basic Stats Explained Populations and Samplesan example Population  all I.U. undergraduates Sample  77 M342 students Parameter  A characteristic of a population. the average I.U. undergraduate is 20.7 years old. Statistic  A characteristic of a sample. Descriptive Statistics Descriptive Statistics 58 20.00 22.00 21.0862 .60072 58 What is your age? Valid N (listwise) N Minimum Maximum Mean Std. Deviation Parameters and Statistics Hypotheses Testing A hypotheses is always a statement about the population , never the sample. A hypotheses refers to a situation that might be true. An exact null: The average nights out per week for IU students is 3. Ho =3 An inexact null: The average nights out per week for IU students is 3 or more nights. Ho >=3 The alternative null: is the opposite of the exact or inexact null. Hypotheses In statistical hypothesis testing, we can never prove anything. We can only find evidence against things. As a result we form the null hypothesis so that the null encompasses what we would not like to be true. It is what the researcher hopes to find evidence against. The null asserts that there will not be a statistically significant difference between the groups. Hypotheses Suppose a Legislator says, In Bloomington, they have eight or more drinks when they go out. This forms our null hypotheses Ho: > 8.0 To refute the Legislator, which we want to do , we try to find evidence for the alternative hypothesis....
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 Fall '08
 CAMP

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