Question
Please show your work. Thank you. Question 1: Study of obesitymales and females between the ages of 20 and 75: n # overweight Males 120
Please show your work. Thank you.
Question 1:
Study of obesitymales and females between the ages of 20 and 75:
n # overweight
Males 120 18
Females 280 70
What is p-hat (males)?
What is p-hat (females)?
What is p-hat, the weighted average of the two proportions?
Question 2:
If x-bar = 100 and s = 20 (units completely theoretical and unimportant) and n = 25, calculate a 95% confidence interval for the true population mean :
Lower limit (to two decimal places) is:
Upper limit (to two decimal places) is:
Value of t/Z used is:
Question 3:
Skin testing was done with an antigen from the bacterium Mycobacterium ulcerans in a 2000 study by Dobos et al.. The odds ratio for developing a skin reaction for subjects receiving burulin vs. subjects receiving controls is (to one decimal place):
Agent
Induration > 10 mm (positive skin reaction) Burulin Control
Yes 17 3
No 12 18
Question 4:
A hypothetical regression equation may be:
headcirc (cm) = 8.31 + 0.45 (gestational age - weeks) + 4.71 (birthweight - kg)
Predict the average head circumference a 30-week old birth weighing 1.1 kg (round to nearest whole number):
Predict the average head circumference a 27-week old birth weighing 0.8 kg (round to nearest whole number):
If the birthweight of two babies is identical, predict the difference in head circumference if the gestational age differs by two weeks (to one decimal place)?
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