cindytest-solution

# cindytest-solution - York University MATH 1131(FALL 2011...

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York University MATH 1131(FALL 2011): Introduction to Statistics Midterm Examination – Wed, Oct 26, 2011, 7:00 p.m.–7:50 p.m. Last Name: Given Names: Student Number: Signature : DO NOT WRITE IN THIS AREA Read the following instructions carefully 1. Students are allowed to bring: a. One 1-sided 8.5”x11” formula sheet (only formulas are allowed and no deﬁnitions nor examples) Put your name on the formula sheet as we will collect the formula sheet with your test papers. b. Calculator(s) (cannot use laptop, cell phone or ipad as calculator) 2. All work must be done in the free space provided be- low for each problem or on the back of the preceding page . 3. No other sheets of paper will be accepted or marked. 4. This exam consists of 11 pages in total. Last 4 pages contain Binomial Distribution Cumulative Probabili- ties tables and Standard Normal Cumulative Proba- bilities tables. Question Max Score Your Score 1 15 2 10 3 10 4 10 5 10 TOTAL 55 1

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Question 1: (15 marks) a. The following stem-and-leaf plot shows the waiting time (in minutes) of several cus- tomers before they were served at the checkout counter. Leaf Unit = 0.1 0 48 1 134688 2 023457899 3 12456778899 4 00123334455567789 5 011223445667888 6 1123334556778 7 0223445789 8 013466 9 0127 10 017 11 25 12 79 i. (1 mark) Describe the shape of the stem-and-leaf plot. SOLUTION: positively skewed (or skewed with a long right tail) ii. (5 marks) Report the ﬁve-number summary. SOLUTION:
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cindytest-solution - York University MATH 1131(FALL 2011...

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