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STAT 1405 Midterm Exam Name _______________ Due...

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STAT 1405 Midterm Exam Name _______________ Due 5/20/2012 Dr. Vazirabadi [Type text] 1 Answer every question on the exam as instructed Exam is out of 100 points This is your INDIVIDUAL work; you may use the text, notes, calculator and MegaStat. All students must follow the University?s Student Code of Conduct and Honor Code. Failure to do so may result in serious consequences such as immediate ?F,? and report to school academic officials. Good Luck!!! Select the best answer/fill in the blanks: 1. for the z test, if ? is unknown and n < 30, one can substitute for ?: a. n b. s c. x2 d. t 2. What are the key assumptions of ANOVA? 3. Complete this statement with the best answer. Rejecting the null hypothesis when it is true is called a ___________ error. Identify each of the following as either false positive (Type I error) or false negative (Type II error): 4. In the medical arena: a mammogram shows suspicious findings (a "positive" breast cancer screening test), but biopsy results are negative (pathology studies were concordant and showed a known benign breast condition that explained the mammogram findings False Positive False Negative STAT 1405 Midterm Exam Name _______________ Due 5/20/2012 Dr. Vazirabadi [Type text] 2 5. In the automobile repair arena: your car won't start and is towed to a garage. The mechanic tests the battery and says it is weak (a "positive" battery-status diagnostic test) and replaces the battery. 24 hours later you are stranded, and further work shows that the battery-grounding cable had actually been loose and was the real problem...this is an example of False Positive False Negative 6. In the arena of spousal relations: a wife notices lipstick on a husband's shirt collar (a "positive" test) and worries about marital infidelity. But she later verifies that her husband actually encountered his Aunt Jane at a lunch break at a local fast food outlet. Old Aunt Jane partly missed her husband's neck with her lipstick-kiss and hit his collar...This marital infidelity is an example of: False Positive False Negative For these exercises where applicable: a. state the hypotheses b. Find the critical value c. State the decision rule d. Compute the test value e. Make a decision f. Summarize the results 7. An educator estimates that the dropout rate for seniors at high schools in Denver is 15%. Last year, 38 seniors from selected from a random sample of 200. At alpha = .05 is there enough evidence to support the claim? STAT 1405 Midterm Exam Name _______________ Due 5/20/2012 Dr. Vazirabadi [Type text] 3 8. A recent survey by the DOL claims that the average salary for teachers in Colorado is less than $60 per day (data based on 2000 census). A random sample of eight school districts is selected and the daily salaries are reported. Is there enough evidence to support the claim at alpha .10? 60 50 60 55 70 55 60 55 Answer the following 4 questions in three sentences or less. 9. Provide a DETAILED example/scenario in which the use of ANOVA is appropriate. 10. Provide a detailed example/scenario in which you would use a Paired Sample t-test. STAT 1405 Midterm Exam Name _______________ Due 5/20/2012 Dr. Vazirabadi [Type text] 4 11. Discuss what the similarities and differences are between an independent sample t-test and ANOVA. 12. A one-way ANOVA has more than one dependent variable and only one independent variable. True False For questions 13 please use the following data set: 13. The depression score for 20 post-trauma patients were collected using a standard depression scale. A therapist discloses the findings with a consultant to see if there is a difference between the two groups (males and females). Her hypothesis is that if there is NO difference between the two groups she can create one group therapy plan. Can the therapist hypothesis be supported at alpha .05? Hint this is a form of a t-test,Hi Natalia, I noticed that on Statistics and Probability-8238703.doc question 13 is not answered,was this an oversight? Karla,For questions 13 please use the attached data set. 13. The depression score for 20 post-trauma patients were collected using a standard depression scale. A therapist discloses the findings with a consultant to see if there is a difference between the two groups (males and females). Her hypothesis is that if there is NO difference between the two groups she can create one group therapy plan. Can the therapist hypothesis be supported at alpha .05? Hint this is a form of a t-test

 

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