{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

STA 301 - HW02

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

This preview shows pages 1–3. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
STA 301-B, Spring 2008 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) The mean number of children is larger than the median number of children. How could you have determined this using only the histogram above?
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 7

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

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online