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Material Type: Exam; Class: INTRODUCTORY BIOSTATS; Subject: Biology (Univ); University: Western Kentucky University; Term: Fall 2005;
Typology: Exams
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Biology 283 Name __________________________ Fall Semester 2005 Exam #4 ID# __________________________
Definitions. Choose any 10 (4 points each).
Association vs. causality –
Positive correlation –
Covariance –
Y intercept –
Regression equation -
Best-fit line –
Residual –
Coefficient of determination –
Goodness-of-fit test –
Observed vs. expected distributions –
Row total vs. column total –
Short Answer. Answer both questions (5 points each).
Dep. Var.: Conception r : 0.76 r 2 : 0.
Estimate SE t p b 0 18.63 0.75 24.84 0. b 1 - 1.63 0.21 7.76 0.
Manufacturing cost/day ($) 0.02 0.06 0.18 0.35 0.40 0.48 0.63 0.80 1.06 1.10 1.66 2. Market price/day ($) 0.31 0.23 0.66 1.07 1.65 0.52 1.08 1.24 1.49 1.72 2.48 2.
In case you need them, the mean and standard deviations for manufacturing cost are 0.73 and 0.63, and the mean and standard deviation for market price are 1.25 and 0.77.
a. Based on these data, is there any evidence to suggest that there is a relationship between the manufacturing cost of these drugs and their market price? In your answer, state the appropriate null hypothesis, carry out the appropriate statistical test to support your interpretation. Show your work. ( points)
b. What led you to choose the statistical method you did, What qualitative conclusions or patterns can you draw from the data as a result? (10 points)