SOLUTION: Billie wishes to test the hypothesis that overweight individuals tend to eat faster than normal-weight individuals. To test this hypothesis, she has two assistants sit in a McDona

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Question 628092: Billie wishes to test the hypothesis that overweight individuals tend to eat faster than normal-weight individuals. To test this hypothesis, she has two assistants sit in a McDonald’s restaurant and identify individuals who order the Big Mac special for lunch. The Big Mackers as they become known are then classified by the assistants as overweight, normal weight, or neither overweight nor normal weight. The assistants identify 10 overweight and 10 normal weight Big Mackers. The assistants record the amount of time it takes them to eight the Big Mac special.
1.0 585.0
1.0 540.0
1.0 660.0
1.0 571.0
1.0 584.0
1.0 653.0
1.0 574.0
1.0 569.0
1.0 619.0
1.0 535.0
2.0 697.0
2.0 782.0
2.0 587.0
2.0 675.0
2.0 635.0
2.0 672.0
2.0 606.0
2.0 789.0
2.0 806.0
2.0 600.0
a)Compute an independent-samples t-test on these data.
Report the t-value and the p values.
Where the results significant?
(Do the same thing you did for the t-test above, only this type when you go to compare means, click on independent samples t-test. When you enter group variable into grouping variable area, it will ask you to define the variables. Click define groups and place the number 1 into 1 and the number 2 into 2)??
b)What is the difference between the mean of the two groups?
What is the difference is standard deviation?
c)What is the null and alternative hypothesis?
Do the data results lead you to reject or fail to reject the null hypothesis?
d)What do the results tell you?
There seem to be a lot of typos. I copied the questions exactly as they are in the homework. I have been racking my brain and trying to figure these problems out using the text book but I am running out of time and need help understanding how to answer these questions. Thank you.
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 

Hi,

I. find Mean and SD for each sample. 

Sample 1: m = 589, SD = 42.615

Sample 2: m = 684.9,  SD = 82.225

II.  Find the t-value

t =

Which is significant at the 99% Level(degree of Freedom 18):  3.2745 > 2.88 				

DF	0.1	0.05	0.01	0.001

18	1.73	2.1		3.92

b)What is the difference between the mean of the two groups? 684.9-589

What is the difference is standard deviation? 82.25-42.615

c)What is the null and alternative hypothesis? 

: m for over weight people ≤ 589

: m for over weight people > 589 

As 3.2745 > 2.88, we reject the null hypothesis

overweight people do eat faster according to this study





 

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