STA 301 - HW02

STA 301 - HW02 - STA 301 Applied Statistics Spring 2008,...

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STA 301 – Applied Statistics Spring 2008, Section B Homework #2 Due Wednesday, February 6 PART I – Paper-and-pencil problems Question 1 : (p. 14, #1.6 modified): The tensile strength of silicone rubber is thought to be a function of curing temperature. A study was carried out in which samples of 12 specimens of the rubber were prepared using curing temperatures of 20°C and 45°C. The data below show the tensile strength values in megapascals. 2.07 2.14 2.22 2.03 2.21 2.03 20°C 2.05 2.18 2.09 2.14 2.11 2.02 2.52 2.15 2.49 2.03 2.37 2.05 45°C 1.99 2.42 2.08 2.42 2.29 2.01 (a) Construct dot plots for the two data sets. (Stack the dot plots, using the same scale for each.) (b) Without calculating anything, comment on the apparent relationship between curing temperature and the following aspects of tensile strength: Mean Variance
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Homework 2 Page 2 of 7 Question 2 The Information Please Almanac provides the number of children of each of the 42 U.S. presidents. The data are provided below. 0 5 6 0 2 4 0 4 10 15 0 6 2 3 0 4 5 4 8 7 3 5 3 2 6 3 3 0 2 2 6 1 2 3 2 2 4 4 4 6 1 2 (a) Create a grouped data table (relative frequency table) for these data, using classes 0-1, 2-3, 4-5, … 14-15. (b) Construct a relative frequency histogram based on the grouped data table from part (a). (c)
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This homework help was uploaded on 04/17/2008 for the course STA 301 taught by Professor Noe during the Spring '08 term at Miami University.

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STA 301 - HW02 - STA 301 Applied Statistics Spring 2008,...

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