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Vin{MBL}
5185 Posts
One of the questions asked to compute a margin of error for a least squares regression of 7 points. (on the graph).I used a t distribution with df = 6 (because there were 7 points). However, the answer key used df = 5 and specifically stated that using df = 6 is partially correct. I don't understand why it is correct to use df = 5. The computer output included this: Source DF Regression 1 Residual 5 Total 6 Thanks in advance.   | ||
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tiffany
3664 Posts
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Vin{MBL}
5185 Posts
shows a graph with correlation = .985 There's a table with computer output. of std. deviation etc; (c) John wants to provide a 98% confidence interval for the slope parameter in his final report. Compute the margin of error that John should use. Assume that conditions for inference are satisfied. | ||
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Specialist
United States803 Posts
I THINK its n - 2. I have not been paying much attention in my AP Stat class for the past month >.< | ||
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Vin{MBL}
5185 Posts
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