Homework Answers
I used R software to solve this question.
R codes and output:
> d=read.table('sbp.csv',header=T,sep=',')
> head(d)
weight age SBP
1 135 3 89
2 120 4 90
3 100 3 83
4 105 2 77
5 130 4 92
6 125 5 98
> attach(d)
> fit=lm(SBP~weight+age)
> summary(fit)
Call:
lm(formula = SBP ~ weight + age)
Residuals:
Min 1Q Median 3Q Max
-4.0438 -1.3481 -0.2395 0.9688 6.6964
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) 53.45019 4.53189 11.794 2.57e-08 ***
weight 0.12558 0.03434 3.657 0.0029 **
age 5.88772 0.68021 8.656 9.34e-07 ***
---
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
Residual standard error: 2.479 on 13 degrees of freedom
Multiple R-squared: 0.8809, Adjusted R-squared: 0.8626
F-statistic: 48.08 on 2 and 13 DF, p-value: 9.844e-07
Equation of least square regression line is,
Systolic BP = 53.4501 + 0.12558 weight + 5.88772 age
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2)
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2)
3)
4)
5)
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2)
3)
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5)
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I need help generating random age(x) and average systolic blood
pressure(y) values or data similar to the table below in matlab. i
need 75 reading or data points for both and plot of age(x) against
blood pressure(y). The age should be a number e.g 1, 22, 13,... and
not 15 to 90, 20-24 like the chart shows for easy plotting. also
the age and blood pressure show be in increasing order like the
table below. Please attach matlab...
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(R programming) The weight and systolic blood pressure of 26 randomly selected males in the age group 25-30 are found in the attached CSV file. Fit a simple linear regression model relating systolic blood pressure (y) to weight (2). (30 points) (a) Provide the R code which fits the model and outputs the summary of the fitting. (b) Report the model fitting summary (c) Write down the fitted linear model and its interpretation. (d) Write down the null...
1. Consider the following estimated outcome: bwght = 119.77-0.514cigs Where bwght-infant birth weight in ounces; cigs-average number of cigarettes the mother smoked per day during pregnancy. (1) What is the predicted birth weight when cigs=0? What about when cigs-20(one pack per day)? Comment on the difference. (2) Does this simple regression necessarily capture a causal relationship between the child's birth weight and the mother's smoking habits? Explain. (3) To predict a birth weight of 125 ounces, what would cigs have...
Stat 50 Final Exam Last Name First Name 13. Consider the following paired data involving the systolic and diastolic blood pressure readings. Systolic 1138 130|135|140|120|12511201130|13011441 143 11401130|15 Diastolic 82一91一100 100180 190ー80一80-80一98- 105-85- 70- 100 ] Diastolic 82 91 100 100 80 90 80 80 80 98 105 8570 100 (a) Does there appear to be a correlation between the systolic and diastolic blood pressure? (b) What is the regression line? (c) Find the best predicted diastolic blood pressure for a...
Age and Gender
1)
2)
3)
4)
5)
Diastolic Blood Pressure and Systolic Blood Pressure
1)
2)
3)
4)
5)
Gender and Measured Weight
1)
2)
3)
4)
5)
Measured Height and Gender
1)
2)
3)
4)
5)
Measured Height and Measured Weight
1)
2)
3)
4)
5)
Systolic Blood Pressure and Measured Height
1)
2)
3)
4)
5)
In terms of strength, which pair of variables (within the
entire matrix) has the strongest correlation between them?
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