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Review Fowler

Review Fowler - COMM 291 SECTIONS 203 204 JANUARY-APRIL...

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COMM 291, SECTIONS 203 & 204, JANUARY-APRIL 2010 END-OF-TERM REVIEW AND PRACTICE SESSION APRIL 16, 2010 12:00-2:00 Three types of questions: 1) General understanding of data, summary numbers, graphs, concepts Deeper questions: 2) Given information is about the population(s) 3) Given information is about the sample(s) General understanding of data, summary numbers, graphs, concepts Deeper questions: Do not pick an approach after only reading the question Write down the numbers given and the question asked, then assign our usual symbols The source or subject of the given information is main clue to type of problem and approach Given information: about population Question: about a value x, or a probability associated with the value x, in this or a related population Approach: nearly always a “probability under Z - curve” question Given information: from sample taken from population Question: about a parameter of the population Approach: nearly always a hypothesis test or a confidence interval

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GENERAL UNDERSTANDING OF DATA, SUMMARY NUMBERS, GRAPHS, CONCEPTS (1) Comparing histograms and the populations means (2) (2004 4 a) The Governor of California proposes to reduce wages of all state employees. If they are reduced by a flat amount of \$500 a year, what would this do… … to the mean annual salary? __________________________ … to the std.dev. of annual salaries? __________________________ If, instead, there is an across-the- board 5% decrease in salaries, what would this do… … to the mean annual salary? __________________________ … to the std.dev. of annual salaries? __________________________
(3) Definitions of and relationships between samples, populations, statistics, parameters (4) (2004 4 c) A newspaper report states that the mean price of housing in a city fell by 4% over the last three months, while the median price increased by 7%. This likely indicates that the prices of the more expensive homes in this area: __A. increased __B. decreased __C. stayed approximately constant (5) (2004 4 f) In a test of significance, the P-value of the test statistic is .063. This means that the test is statistically significant at: __A. both the .05 and .01 levels __B. the .05 level but not at the .01 level __C. the .01 level but not at the .05 level __D. neither the .05 or the .01 levels __E. cannot tell; the answer depends on the specific null and alternative hypotheses

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DEEPER QUESTIONS (1) 2004 2 A company wants to evaluate two methods of training new employees to use a word processing system. It has no prior idea which method (A or B) will be more effective. Forty new
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Review Fowler - COMM 291 SECTIONS 203 204 JANUARY-APRIL...

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