midterm1_solutions

midterm1_solutions - MA 213 Fall 2007 Midterm 1 - Solutions...

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MA 213 Fall 2007 Professor: Michael J. Pencina Midterm 1 - Solutions 1. Double Multiple Choice: in the following questions exactly two answers are correct. If you give two correct answers you get 4 points; if you give only one answer and it is correct you get two points; if you give two answers, one correct and one incorrect, you get only 1 point; in all other situations you get zero points. 1.1 To calculate standard deviation using SAS you need to use: A) proc means; B) proc chart; C) proc gchart; D) proc univariate; E) proc freq; A D 1.2 Which two are true: A) a specific collection of sample points is called a population; B) independent events cannot occur at the same time; C) random sample is the most basic outcome of an experiment; D) the sample space of an experiment is the collection of all its sample points; E) sample is a subset of a population; D E 1.3 Events A and B are mutually exclusive and P(B)≠0. Which two are false : A) ) ( ) ( ) ( B P A P B A P = ; B) 0 ) | ( = B A P ; C) ) ( ) | ( B P B A P = ; D) ) ( ) ( ) ( B P A P B A P + = ; E) 0 ) ( = B A P ; A C 1.4 Which two are true: A) If median > mean then the distribution is skewed to the right; B) If the distribution is skewed to the left then the standard deviation is negative; C) It can happen that q1 = q3 (the first and third quartile are equal); D) For normal data 27% of the points lie between 1 and 2 standard deviations from the mean. E) Sample standard deviation cannot exceed the sample mean;
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midterm1_solutions - MA 213 Fall 2007 Midterm 1 - Solutions...

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