SECTION 7.1169r∑ni1yiyziz∑ni1yiy2∑ni1ziz20 7513.The correlation coefficient between temperature and stirring rate isr∑ni1xixyiy∑ni1xix2∑ni1yiy20 9064.(b) No, the result might be due to confounding, since the correlation between temperature and stirring rate is farfrom 0.(c) No, the result might be due to confounding, since the correlation between temperature and stirring rate is farfrom 0.9. (a)x105 63,y38 84,∑ni1xix22 821,∑ni1yiy247 144,∑ni1xixyiy5 902,n10.r∑ni1xixyiy∑ni1xix2∑ni1yiy20 51178.W12ln1r1r0 56514,σW11030 377964.A 95% confidence interval forμWisW1 96σW, or1 30595 0 17567 .A 95% confidence interval forρise21 305951e21 305951e2 0 175671e2 0 175671, or0 8632 0 1739 .(b) The null and alternate hypotheses areH0:ρ0 3 versusH1:ρ0 3.r0 51178,W12ln1r1r0 56514,σW11030 377964.UnderH0, takeρ0 3, soμW12ln10 310 30 30952.The null distribution of
This is the end of the preview.
access the rest of the document.