FMST 210 Chapter 13: Chapter 13
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In designing an experiment we have used experimental control and random assignment to ensure that our experimental groups are equivalent. However, if w observe a difference between the mean so the two groups it is due. Booth to the effect of our independent variable & random error (i. e. chance) Inferential statistics give us a way of knowing ho likely that he difference between the groups is due to chance. Imagine you had a friend, sarah, who claims she can pick out people with high iqs from a crowd, 68% of people is 85-115. 95% of people 70-130 . Null hypothesis : the independent variable has no effect. Research (alternative) hypotheses: the independent variable has an effect. We test the probability that the null hypothesis is true. If the probability is low, then we can reject the null hypothesis and conclude in favor of the research hypothesis. Iv: giving(children are asked to give or receive treats)