Stat Homework 10-28

Stat Homework 10-28 - 10.62 7 6 5 4 Mass(pound) 3 2 1 0 0...

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10.62 There is a strong negative correlation between the mass and the time.  r= -0.09 10.64 There is a strong positive correlation  a) Yes there is a trend in the data b) r 0.612 df 40 The correlation means that there is a fairly strong positive correlation c) t 4.897  = 0 ρ p 0.000  =/ 0 ρ Since p = 0, we cannot reject the null hypothesis; not enough evidence Use test statistic for t: =r/sqrt(1-r^2)/n-2 d) r 0.31  = 0 ρ H 0 H 1 H 0 0 10 20 30 40 50 60 0 1 2 3 4 5 6 7 Time (minutes) Mass (pound) -10 -5 0 5 10 15 20 0 10 20 30 40 50 60 70 80 Column B Linear Regress for Column B Change in Weight Digestion Efficiency
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t 1.81  =/ 0 ρ p 0.08 Since p=.08, we can reject the null hypothesis. There is evidence of a relationship between weight change and digestion efficiency without the duck chow info. e) repeat process for digestion efficiency and acid detergent fiber Yes, there is a strong negative trend between the two factors r -0.88 This value means that there is a strong negative correlation between the variables t -11.72  = 0 ρ p 0  =/ 0 ρ Since p is not equal to 0, we can reject the null hypothesis There is evidence of a correlation between digestion efficiency and acid  detergent fiber   Exclude duck chow data r -0.65 df 31 t -0.03 p 0.98 Since p is not equal to 0, we can reject the null hypothesis. There is enough evidence 10.82 a/b) H 1 H 0 H 1 H 0 H 1 1,500.00 2,000.00 2,500.00 3,000.00 3,500.00 f(x) = 0.01x + 1852.32 Column B Retail Sales: Eating and Drinking Places ($) 0 2 4 6 8 10 12 0 2 4 6 8 10 12 Linear Regressio for Digestion Efficiency Acid Detergent Fiber
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c) The least squares line does not seem to be a good predictor
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This note was uploaded on 08/07/2011 for the course STAT 930 taught by Professor Dong during the Fall '10 term at Rutgers.

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Stat Homework 10-28 - 10.62 7 6 5 4 Mass(pound) 3 2 1 0 0...

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