Question

TOTVOL: Total Brain Volume (cm3)			WEIGHT: Body Weight (kg)
963			58.968
1005			57.607
1027			58.514
1029			81.648
1034			62.143
1035			64.184
1051			133.358
1067			83.916
1070			83.009
1079			107.503
1079			61.236
1100			88.452
1104			79.38
1160			72.576
1173			61.236
1204			79.38
1272			61.69
1281			63.958
1347			97.524
1439			99.792

Open Brains data. Test if the weight of people with Brain Volume = 1100 or more and the weight of people with Brain Volume less than 1100 are significantly different on average. Answer questions 13 to 16.

13. What test did you perform? (6.25 points)

• a. Simple Regression
• b. Multiple Regression
• c. Two sided t-test
• d. None of these

14. What is the P-value? (6.25 points)

• a. 0.932448
• b. 0.000826
• c. 0.379046
• d. None of these

15. What is the Statistical interpretation? (6.25 points)

• a. The P-value is too large to have a conclusive answer.
• b. The P-value is greater than 5% thus we are very certain that the averages are significantly different.
• c. The P-value is greater than 5% we are not confident that the slope is not zero.
• d. The P-value is smaller than 5% thus we are very certain that the averages are significantly different.
• d. None of these

16. What is the conclusion? (6.25 points)

• a. Since the test is inconclusive the conclusion is inconclusive as well.
• b. The test is inconclusive and more data is needed.
• c. We can claim that the weight of people with Brain Volume = 1100 or more and the weight of people with Brain Volume less than 1100 are significantly different on average.
• d. We cannot claim that the weight of people with Brain Volume = 1100 or more and the weight of people with Brain Volume less than 1100 are significantly different on average.
• e. None of these

Answer 1