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Question: Many of the world's most successful companies rely on The NPD Group to provide global sales and marketing information that helps clients make more informed, fact-based decisions to optimize their businesses. These customers need NPD help for insight on what is selling, where, and why so that they can understand and leverage the latest trends. They recently (July 2009) released the following results of a survey intended to determine the market share distribution for the major corporations that make digital music devices:
Corporation Apple SanDisk Creative Technology iRiver Samsung
Market Share 74% 6.4% 3.9% 3.6% 2.6%
a. Generate a bar chart to display these data.
b. Generate a pie chart to display these data.
c. Which of the two displays most effectively presents the data? Explain your answer.
When bucketing data for a histogram what is the standard way of dealing with data entries that are on the boundary of two buckets?
How many questions must the test contain in order to reduce the standard deviation of Julie's proportion of correct answers to one-fourth its value for an 100-item test?
1. a random variable is binomially distributed with n 16 and pi .40. the expected value and standard deviation of the
Construct a frequency distribution of grouped scores with approximately 10 intervals.- Construct a histogram of the frequency distribution constructed in part a.
Calculate the mean number and median number of apples in a bag.
a student wants to assess whether her dog muffin tends to chase her blue ball more often than she chases her red ball.
Test at the alpha = 0.10 level, whether the manufacturer's claim is true.
the national high school sports database reports that players of lacrosse average 55 goals per season. the standard
Construct a 99% confidence interval estimate for the population mean weight of the tea bags. Is the company meeting the requirement set fourth on the label that the mean of tea in a bag is 5.5 grams?
suppose a computer chip manufacturer rejects 2 of the chips produced because they fail presale testing. whats the
you have been recently hired as a marketing analyst in an advertising agency. you are assigned the task of assessing
Scores on a scholastic aptitude test are normally distributed with standard deviation σ=100 points. A group of 25 inner city high school students takes the test; their mean scores is x-bar = 440 points.
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