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hw5fall11

# hw5fall11 - Problem 4(4.a A sample of 150 chronic carriers...

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STAT5044: Regression and ANOVA Homework #5 Problem# 1. Redo the number of boys example (note 16) by combining the first two cells { 0,1 } and the last two cells { 7,8 } to make the expected cell frequencies at least 5. Report the p-value and comare the results Problem# 2. In 1987, the Minnesota Twins (one of the teams in the 1987 World Series) played 162 games. Of the 81 home games, they won 52 and, of the 81 away games they won 33. Calculate the appropriate test statistic to assess if winning is independent of location. (Hint: set up your contingency table rst!) Problem# 3. To assess the effectiveness of two diets A and B, 150 infants were included in a study. Diet A was given to 80 randomly selected infants and diet B to the remaining 70 infants. After some time has passed, the health of each infant was classied into “excellent”, “average”, and “poor” and the result is summarized in the following table. Excellent Average Poor Sample size Diet A 37 24 19 80 Diet B 17 33 20 70 Totals 54 57 39 150 Test at 5% whether there is any difference between the quality of the two diets.

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Unformatted text preview: Problem# 4. (4.a) A sample of 150 chronic carriers of a certain antigen and a sample of 500 noncarriers revealed the blood group distributions given below. O A B AB Carriers 72 54 16 8 Noncarriers 230 192 63 15 Researchers want to know whether the two populations from which the samples are drawn diﬀer with respect to blood group distribution. Which type of test is appropriate for the problem? (4.b) A sample of 500 elementary school children in a certain school system were cross-classied by nutritional status and academic performance. Nutritional Status Poor Good Academic Poor 105 15 Performance Satisfactory 80 300 Researchers want to know if they can conclude that there is a relationship between nutritional status and academic performance. Which type of test is appropriate for the problem? 1 Problem# 5. Redo the lab 11 and describe your ﬁnding for each example in lab 11. 2...
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hw5fall11 - Problem 4(4.a A sample of 150 chronic carriers...

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