Lecture Slides PSY201 10.7.13

# Determine the signicance cuto use the t table 4

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Unformatted text preview: ing amounts of informa&gt;on.   When there are inﬁnite degrees of freedom, the t distribu&gt;on is the same as the normal curve. ▪  This is because your sample is inﬁnitely large and thus, becomes the same as the popula&gt;on… so the es&gt;mate is perfect 7 10/6/13   To ﬁnd cutoﬀs on the t distribu&gt;on, you use a t table.   Step 3 of hypothesis tes&gt;ng involves determining the cutoﬀ sample score for rejec&gt;ng the null hypothesis   Previously, we looked for the cri&gt;cal Z score using the normal curve table   For a t test, we use the t table to determine the cutoﬀ sample score   Step 4 involves ﬁnding your sample mean’s score on the comparison distribu&gt;on   Conver&gt;ng the raw mean to a t score Steps in Hypothesis Tes4ng Diﬀerence from when Popula4on Variance is Known 1. Restate the ques&gt;on as a research hypothesis and a null hypothesis about the popula&gt;ons. No diﬀerence in method 2. Determine the characteris&gt;cs of the comparison distribu&gt;on •  Popula&gt;on mean •  Popula&gt;on variance •  Standard devia&gt;on of the distribu&gt;on of sample means •  Shape of the comparison distribu&gt;on •  No diﬀerence in method •  Es&gt;mate pop variance from the sample •  No diﬀerence in method, but based on es&gt;mate from sample •  Use the t distribu&gt;on with df = N  ­ 1 3. Determine the signiﬁcance cutoﬀ Use the t table 4. Determine your sample’s score on the comparison distribu&gt;on. No diﬀerence in method (but called a t score) 5. Decide whether to reject the null hypothesis. No diﬀerence in method 8 10/6/13 1.  Restate the ques&gt;on as a research hypothesis and null hypothesis about the popula&gt;ons. 2.  Determine the characteris&gt;cs of the comparison distr...
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