AP Stats question. HELP! I feel stupid. :(

Diana606
Tue, 04 Apr 2006 19:20:24 +0000

To transform the data, you enter the year vs. log(productivity) in your calculator tables. But for the years, you want to simplify it, so 1940 would be 0, and then 1945 would be 5 and so on. That would give you the equation of the transformed data. Yeah, then add an extra column to show the transformed points from each year which you get from your calculator when you log the productivity values.

Use the scatterplot function on the calculator along with the y= to graph the data.

I guess for the third one you just pick some points and make an LSRL out of it (with the transformed data). So you then you do the 1-variable-stats and you write down the line they give you. I think that’s what you do.

You have your line as log y=… So make make that 10 to the (all the variables) power. So it would be 10 to the (log y) power = 10^(constant) + 10^ (slope). Then you just solve that to make the new line. For one thing 10^(log y) just gives you y, and then equals…

Yeah, that’s like y - y hat kind of stuff. So you just plug in 45 for x in the equation to get an observed value. Then you compare those two values like which is lower and stuff and why. Or maybe you just have to calculate it and then do the y - y hat to get the residual point.