Practice exam 1

Practice exam 1 - Spring 2009 STATISTICS 371-001 Practice...

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Spring 2009 STATISTICS 371-001 Laughlin Practice for Midterm Exam #1 You must show all work in order to receive full credit for a problem, including the formula that is used in solving the problem. 1. Four scales of measurement were introduced in this class: nominal, ordinal, interval and ratio. What additional information is obtained from measurements on an interval scale compared to measurements on an ordinal scale? 2. The following n = 13 scores were obtained on a statistics quiz. 8, 9, 13, 16, 18, 18, 18, 18, 20, 20, 20, 21, 21 (a) What is the median, Q 1 and Q 2 ? (b) Graph the data using a stem-and-leaf plot. (c) What type of data are these in terms of question 1 above? (d) What is the mode of these scores? 3. Below is a table of the number of children in families on my street: Number of children in family Number of families 0 3 1 5 2 4 3 0 4 1

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(a) Draw a graph of these data using bars. (b) What is the mean number of children for families on my street? 4. Below are 4 samples of n=4 each. Which sample has the smallest standard deviation? Note: You should not need to calculate the
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Practice exam 1 - Spring 2009 STATISTICS 371-001 Practice...

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