A hospital is using X bar and R charts to record the time it takes to process patient account information. A sample of five applications is taken each day. The first four weeks’ (20 days’) data give the following values:  =16 min  =7 min If the upper and lower specifications are 21 minutes and 13 minutes respectively, calculate , Cp and Cpk. Interpret the indices. root cause? Conduct hypothesis testing such as Z test, t test, and ANOVA Use comparative designs

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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.