Statistics

1. A researcher surveyed students with this request: “Enter your height in inches.” What’s wrong with this request? Identify at least two problems. What would be a better way of collecting this information? Explain your reasoning.

2.Search newspapers, magazines, or the Web to find an example of a graph that is misleading. Provide the graph and describe how it is misleading. Redraw the graph so that it depicts the information correctly.

3. Search newspapers, magazines, or the Web to find graphs of the types discussed in chapter 2 (histogram, ogive, bar graph, pareto chart, pie chart, time series graph, stem and leaf display, scatter plot) . List the variables used, methods of data collection, and general types of conclusions drawn from the graphs. Provide 3 examples.

4. An average is an attempt to summarize a collection of data into just one number. List three areas of daily life in which you think the mean, median, or mode would be the best choice to describe an “average”. Explain!

5. Mensa International calls itself “the international high IQ society,” and it has more than 100,000 members. Mensa states that “candidates for membership of Mensa must achieve a score at or above the 98th percentile on a standard test of intelligence.” Find the 98th percentile for the population of Wechsler IQ scores. This is the lowest score meeting the requirement for Mensa membership. Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15.

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