Exam 4: Graphical Descriptive Techniques Numerical Data

The number of faulty items returned to a manufacturer of electric goods in the last 15 years is as follows: Year No. of faulty items 2001 27 2002 35 2003 34 2004 39 2005 43 2006 42 2007 40 2008 41 2009 45 2010 47 2011 46 2012 50 2013 49 2014 52 2015 52 a. Construct a frequency bar chart for these data. b. Construct a line chart.

Describe the linear relationship between the two numerical variables in each of the following scatter diagrams. A. B. C.

Frequency polygons are useful for obtaining a general idea of the shape of the distribution, because they are a bar chart.

Describe briefly what the histogram and the stem-and-leaf displays tell you about the test grades for a university business statistics class. 63 74 42 65 51 54 36 56 68 57 62 64 76 67 79 61 81 77 59 38 84 68 71 94 71 86 69 75 91 55 48 82 83 54 79 62 68 58 41 47

Which of the following statements about histograms is true?