stat prelim II 2007

# stat prelim II 2007 - H ADM 201 Preliminary Examination II...

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H ADM 201 Preliminary Examination II Tuesday, April 3, 2007 Name (Print CLEARLY):_____________________________________________ Please check your recitation section in the space provided below : H ADM 201, Section 1. (Mondays 5:30 PM: Betsy Beckert) H ADM 201, Section 2. (Mondays 7:30 PM: Daniel Gomez) H ADM 201, Section 3. (Tuesdays 4:30 PM: Amanda Meister) H ADM 201, Section 4. (Tuesdays 7:30 PM: Bradlee Hancock) ***Make sure to fill out the information requested above. GRADING SHEET QUESTION MAXIMUM SCORE SCORE EARNED Question 1 30 Question 2 15 Question 3 20 Question 4 35 Total 100

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H ADM 201 Prelim II Spring 2007 Question 1 A. 10 points . A) A manager wants to compare the spending habits for males and females in his restaurant. The boxplot below depicts two random samples of 60 observations each of total spent for males and females. Data Males Females 40 35 30 25 20 15 10 Boxplot of Females, Males A) (6 pts) Compare the two distributions in two sentences or less. B) (4 pts) Under what circumstances is it appropriate to use a bar chart instead of a histogram? 2
H ADM 201 Prelim II Spring 2007 Question 1 B. 20 points. New regulations force a vendor of theme t-shirts to move her stand further away from a concert hall. The vendor wants to know how her new location compares with the old one. She records the number of t-shirts sold the first four nights at the new location; the hall is sold out during those nights: 116, 128, 132, 120 A) (8 points) Using the data above, compute AND INTERPRET a 95% confidence interval for the mean number of t-shirts sold per night at the new location. Assume all assumptions for inference are met. B) (8 points) Has the location change reduced the number of t-shirts sold from 130 per night, the mean at the old location? Define the parameter of interest, state the hypotheses in terms of the parameter of interest, compute the test statistic, a range for the p-value, and then your conclusions using α = 0.05. Question 1B Continued on next page. 3

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H ADM 201 Prelim II Spring 2007 Question 1B continued from previous page. C) (4 points) Is subjective inference needed in this study? Explain in one sentence. If needed, is it valid? Explain in one sentence.
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