Quiz 1 - In Lab Review

# Quiz 1 - In Lab Review - Quiz 1 In Lab Review(W08...

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Quiz 1 – In Lab Review (W08) 1. “Statistical thinking will someday be as necessary to . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . as the ability to read and write. H. G. Wells (1866-1946) 2 - Class A vs B : An instructor teaches two classes, Class A and Class B (40 students each). The frequency plots for the quiz scores are given below. You find a quiz of a student, but notice they did not circle which class they are in. You will use his/her quiz score to make a decision about the following hypotheses. H 0 : The student is from Class A. H 1 : The student is from Class B. X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 Quiz Score Quiz Score a) What is the direction of extreme for this test? 1-sided to the L 1-sided to the R 2-sided b) Suppose the decision rule were to reject Ho if X = 0 or X = 10. If so, the value of alpha = . . . . . . . . . c) That value of alpha represents the probability of a mistake , namely concluding the quiz is from Class A when in fact, it was from Class B. True False d) Also, you can calculate beta, the probability of a type 2 error. Here, β = . . . . . . . 3 - The data in Study X was not statistically significant at the 5% level. Which of the following p-values could apply? (Circle all that apply) 0.007 0.041 0.098 0.151 4 - Stat 100 Students : For many years, we’ve assumed that only 5% of the Stat 100 students take another statistics class. The Statistics Department believes that this value is too low and decides to take a sample of 20 students out of the 355 students that took Statistics 100 (F05) and determine if they continued their statistical education. a) Suppose (by the luck of the draw) the 20 students selected for this study were the ones that received high scores on the midterm. This would be an example of what kind of bias?

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• Winter '08
• Veneable
• Statistics, Statistical hypothesis testing, class a, new treatment, score sheet, Categorical Categorical Categorical

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