7. Does eating oatmeal reduce the level of bad cholesterol (LDL)? Here are two w

Question

7. Does eating oatmeal reduce the level of bad cholesterol (LDL)? Here are two ways to study this question. A researcher finds 500 adults over 40 who regularly eat oatmeal or products made from oatmeal. She matches each with a similar adult who does not regularly eat oatmeal or products made from oatmeal. She measures the bad cholesterol (LDL) for each adult and compares both groups. Another researcher finds 1000 adults over 40 who do not regularly eat oatmeal or products made from oatmeal and willing to participate in a study. She assigns 50046 of these to a diet that includes a daily breakfast of oatmeal. The other 500 continue their usual habits. After 6 months, she compares changes in LDL levels. a. b. i. Identify what method of data collection the researchers used in both cases and justify your answer ii. Why does the experiment give more useful information about whether oatmeal reduces LDL? 8. Fred keeps his savings in his mattress. He began with $1000 from his mother and adds $100 each year. His total savings y after x years are given by the equation Y-1000+ 100x Draw a graph of this equation. To do so, choose 2 values of x, such as 0 and 10 Compute the corresponding values of y using the linear equation. Plot these two points and draw the straight line joining them. After 20 years, how much will Fred have in his mattress? If Fred had added S200 instead of S100 each year to his initial S1000, what is the equation that describes his savi a. b. c. ngs after x years?

Explanation / Answer

SolutionA:

y=1000+100*x

For X=0

y=1000+100*0=1000

(0,1000)

For x=10

y=1000+100*10=2000

(10,2000)

plot points

Solutionb:

substitute x=20

y=1000+100*20

y=3000

He will ahve $3000

Solutionc:

The new regression equation is

y=1000+200x

y intercept=1000

slope=200

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