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@Olivia van Aalst:
You can in general always take the degrees of freedom that are closest, this should not change your answer on the exam. The reason why they sometimes round down is to be a bit more conservative. If you take a value with lower degrees of freedom, the critical value in the table will be higher --> this implies that it will be harder for me to reject. Hence, I am less likely to do a Type I error - this is what is meant with being more conservative.
I hope that helps.
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Zprice*Zfloor
first get each
Zx (Zx = x - mean x / Sx)
and
Zy (Zy= y - mean y / Sy)
Then multiply Zx with Zy.
For example
Zx = (240-236.917/57.236)=0.0538
Zy= (138-112.5/48.352)=0.527
Zx*Zy = 0.0538*0.527= 0.0284
Isnt this because we are checking for a correlation that the explanatory variable explains the response variable. (so we are looking at the higher the price, the more area, and not the other way round)
Hey :) That is true, but also the relationship is the same, so it would just be the same number in the upper right corner so excel is just leaving it out.
I'm confused as to in what order to put the x and y columns in... in the book it says to put the x-variable (floor) and the y-variable (price) next to each other in that order. You put them in the other way around.
Matrix B gives the inputs(door, window, plank) needed to produce a sauna or garden house.
Matrix A gives the minutes per machine needed to produce these inputs(door, window, plank).
use the formula '=STANDARDIZE(x; mean; standard_dev)'
for example Zprice of price 240 (mean of price is 236.9167, stdev of price is 57.23672) --> =STANDARDIZE(240; 236.9167; 57.23672)
Oh yeah sorry, I misunderstood 😅 But if you look at the matrix above, you can see that the A was in the matrix with coefficient 1. So what I did was move it to the left of the = sign, which would make it -A. That’s why I just flipped everything, because that’d make it A! :) Hope this helps.
You are right, if p & q are both = 2 then it is inconsistent. If both are unequal 2 there can be more solutions but I am not sure if it gives infinitely many solutions.
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Thank you very much for posting , but I think in task 2 it's not the matrix times architect, engineer, etc, but times Flower and Sun Resort (also if u see at the condition 3x2 multiplied with 2x1). Nevertheless, very helpful!
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Heya, I just noticed I wrote it in quite an illogical order, but I derived it from the system of linear equations I mentioned two steps above! (The q=4-0.2p+0.4Y etc.)