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Solutions_Activity_09 - ACTIVITY 9 Solutions Activity 9.1...

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ACTIVITY 9 - Solutions Activity 9.1 For mean confidence intervals we call into use Table A2 which can be found in this week’s folder. The first concept to understand is the idea of Degrees of Freedom (DF). For our activity today, since we are only concerned with one mean (either from one sample of a difference between paired data), DF = sample size – 1 (i.e. n – 1). When finding confidence intervals, Table A2 provides the t multiplier (t*) for the confidence interval expression: if data is consists of only one sample if data involves looking at the differences between paired data. NOTE: you will notice that the DF column in this tables only increases by 1 from 1 to 30. After that the increments vary. If your DF is NOT found in the table then conservatively use the CLOSEST df in the table that does not exceed the DF of interest. For example, if the degrees of freedom were 37 then from the table use 30. Find t-multipliers and DF from Table A2 for the following conditions: Confidence Level 90%, n = 25: t* = 1.71 DF = 24 Confidence Level 95%, n = 25: t* = 2.06 DF = 24 Confidence Level 95%, n = 35: t* = 2.04 DF = 34
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