How quickly do synthetic fabrics such as polyester decay in landfills? A researcher buried polyester strips in the soil for different length of time, then dug up the strips and measured the force required to break them. Breaking strength is easy to measure and is a good indicator of decay; lower strength means the fabric has decayed. Part of the study buried 50 strips in well-drained soil in the summer. Ten of the strips, chosen at random, were dug up after each of 2 weeks, 4 weeks, and 8 weeks. Here are the breaking strengths in pounds: 2 weeks 122 126 127 124 130 123 123 129 133 119 4 weeks 110 114 118 119 113 118 111 122 113 115 8 weeks 96 99 100 101 107 102 103 112 102 109 Analyze this data to determine if burial time has a significant effect on the strength of the fabric. Be sure to give a full statistical analysis.

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Bar Graphs

A bar graph is a chart or graphical representation of data. A bar chart, also known as a bar graph, is a graph or chart that displays categorical data using rectangular bars with heights or lengths equal to the values they represent. Typically, bar graphs show categorical and numerical variables grouped in class intervals. A bar graph is useful for comparing and analyzing a set of data.