Roper Through their Roper Reports Worldwide, GfK Roper conducts a global consumer survey to help mul-tinational companies understand different consumer attitudes throughout the world. Within 30 countries, theresearchers interview 1000 people aged 13–65. Theirsamples are designed so that they get 500 males and500 females in each country. (www.gfkamerica.com)a) Are they using a simple random sample? Explain.b) What kind of design do you think they are using?

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Q: New York State has approximately 250,000 employees across over 70 state agencies, commissions and…

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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.