3. Like many people, I constantly worry about the amount of...

3. Like many people, I constantly worry about the amount of exercise I take... or rather don't take. I know I should spend hours in the gym every day and run marathons just for fun. After all, there's no such thing as too much exercise, is there? Actually, according to a recent study, there is. Researchers studied top athletes who are now in their fifties and found that some of them had damage to their heart muscles. Men of the same age who didn't exercise so intensively had no damage. So perhaps I'm doing the best thing by sitting at home on the sofa? Unfortunately not. It seems the best advice is still the old saying: moderation in all things. The underlined word damage is used as a verb. Select one: ? True ? False

Transcript

00:01 Okay, so i see that you need help with this question and it says that it wants you to use a simple linear regression to find the parameters for the line that minimizes the msc for the time series.

00:11 Do not run your intermediate computations and run your final answer to four decimal places.

00:17 So, what you're going to do first is you're going to find the average, and i'm using excel because that's the only type of program that you really should be using for this type of a problem.

00:30 So, you're going to find the average of your x value and then the average of your y value.

00:37 Then you're going to take each one of your x values and you're going to subtract your mean of x, which is 8, and i'm going to drag this down.

00:49 Then you're going to take your y value and you're going to subtract your mean of y and drag that down.

00:57 Then you're going to multiply your x minus the mean of x times your y minus the mean of y.

01:05 You're going to do that for each one of them.

01:07 Multiply, multiply, multiply, multiply.

01:12 So, then you're going to total that column.

01:16 Then you are going to square each one of these values.

01:20 So, equals, square.

01:27 Then you're going to total that column.

01:30 Then you're going to square each number in that column.

01:35 Equals, then square, and then you're going to total that column.

01:48 Then you're going to find your slope.

01:52 You're going to take your sum of your products and you're going to divide it by the sum of the squares of x.

01:58 Then you're going to find your y intercept.

02:01 You're going to take your mean of y and you are going to subtract it from your mean of x times your slope...

Question

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