In studying the relationship between Lung Cancer and Smoking, Dr. Vivek Murthy,

Question

In studying the relationship between Lung Cancer and Smoking, Dr. Vivek Murthy, Surgeon General of the United States arrive at coefficient of 1.10. Discuss the results. Kendall Ford pays each sales person a weekly salary of $1,000 per month plus $900 number of cars sod and let "x" denote the number of cars sod and let "y" denotes a sales person's salary. Please write the Regression Equation that gives the relationship between "x" and y". Dr. Ron Crawford gave his SOC 103 Marriage and the Family a 50 question multiple choice test with each problem having 5 possible answers. Assume all students are unprepared for the examination. Compute the Mean, Variance and Standard Deviation of correct answers Mean: _____ Variance: ______ Std Deviation: _________

Explanation / Answer

Ans:

3) Binomial distribution:

n=50

probability of answering a question correctly=p=1/5=0.2

Mean=np=50*0.2=10

Variance=np(1-p)=50*0.2*(1-0.2)=10*0.8=8

standard deviation=sqrt(np(1-p))=sqrt(8)=2.83

2)Regression eqn:

y=1000+900x

1) correlation coefficient of 1.1 means it was calculated incorrectly as it must be between 1 & -1, inclusive.

if it was 1,then it means that there is perfect positive linear correlation between smoking and lung cancer

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