Help on all of these would be much appreciated! A study compared the number or c
ID: 3273307 • Letter: H
Question
Help on all of these would be much appreciated!
A study compared the number or cancerous skin lesions on the right and left arms of 5, 000 males from 5 separate dermatology clinics. Is there a significant difference between the mean number of lesions on right and left arms? The study in #2 raised some interesting points, so clinicians took a random sample of 15 patients in the 90^th percentile (containing most skin lesions), and compared the number of cancerous skin lesions on the right and left arms. Individually, is there a significant difference between right and left arms in this patient sample? An investigation into BMI and Systolic Blood Pressure was conducted from a sample of 9 overweight/ patients from local doctor's office. Is there a correlation between BMI and Systolic blood pressure, and bow strong is it? The blood groups of 400 individuals, from 4 different ethnic groups were recorded with the following results: Is there as association between blood group and ethnic group? The effect of enzyme concentration on rate of a reaction was investigated with the following results. Plot a graph of these results, fit a straight line to the data, and find the slope of this line. Use the slope to predict the rate at an enzyme concentration of 0.7mM.Explanation / Answer
Q3)
h0=their is segnificant differance between right arm and left arm
v/s
h1=their is segnificant no differance between right arm and left arm
y=scan("clipboard")
Read 6 items
> x
[1] 210 189 321 265 350 150
> y
[1] 63 46 101 54 119 74
> t.test(x,y)
Welch Two Sample t-test
data: x and y
t = 5.0465, df = 6.2969, p-value = 0.002033
alternative hypothesis: true difference in means is not equal to 0
95 percent confidence interval:
89.19818 253.46848
sample estimates:
mean of x mean of y
247.50000 76.16667
decision=p value is less than 0.5 then reject ho
conclusion= their is segnificant no differance between right arm and left arm
Q4)
h0=their is segnificant differance between right arm and left arm in patient sample
v/s
h1=their is segnificant differance between right arm and left arm in patient sample
> x=c(4,2,1,2,3,1,2,3,3,4,2,5,6,2,1)
> y=c(1,0,1,1,2,1,0,0,0,2,1,2,1,0,1)
> t.test(x,y)
Welch Two Sample t-test
data: x and y
t = 4.3502, df = 20.588, p-value = 0.0002926
alternative hypothesis: true difference in means is not equal to 0
95 percent confidence interval:
0.973216 2.760117
sample estimates:
mean of x mean of y
2.7333333 0.8666667
decision=p value is less than 0.5 then reject ho
conclusion= their is segnificant no differance between right arm and left arm
Q5)
ho=their is correlation between Bmi and blood pressure
h1=their is no correlation between Bmi and blood pressure
> x=c(36,26,28,28,32,34,27,38,32)
> y=c(141,123,130,138,165,180,123,190,177)
> cor.test(x,y)
Pearson's product-moment correlation
data: x and y
t = 3.4083, df = 7, p-value = 0.01131
alternative hypothesis: true correlation is not equal to 0
95 percent confidence interval:
0.2646496 0.9537214
sample estimates:
cor
0.7899331
decision=p value is less than 0.5 then reject ho
conclusion= their is no correlation between Bmi and blood pressure
>
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