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Guitar Hero and Rock Band. An electronic survey of size 7061 reported that 67% of players of Guitar Hero and Rock Band who do not currently play a musical instrument said that they are likely to begin playing a real musical instrument in the next two years.11 The reports describing the survey do not give the number of respondents who do not currently play a musical instrument.
(a) Explain why it is important to know the number of respondents who do not currently play a musical instrument.
(b) Assume that half of the respondents do not currently play a musical instrument. Find the count of players who said that they are likely to begin playing a real musical instrument in the next two years.
(c) Give a 99% confidence interval for the population proportion who would say that they are likely to begin playing a real musical instrument in the next two years.
(d) The survey collected data from two separate consumer panels. There were 3300 respondents from the LightSpeed consumer panel, and the others were from Guitar Center's proprietary consumer panel. Comment on the sampling procedure used for this survey and how it would influence your interpretation of the findings.
A random sample of 10 yields the following thicknesses (in millimeters): 0.0048, 0.0053, 0.0051, 0.0051, 0.0052, 0.0049, 0.0051, 0.0047, 0.0054, 0.0052. Find the average loss per reel.
How accurately do the exam scores predict final grades? Compute the standard error of the estimate.
Use an α of your choice, and determine whether statistical evidence indicates a change in customer satisfaction. If you determine that a change did occur, state whether you believe customer satisfaction has improved or deteriorated.
Potential jurors. Here are descriptive statistics and a scatterplot for the reporting percents in 2003 and 2004 from Table 28.2. (a) Use the descriptive statistics to compute the least-squares regression line for predicting the reporting percent fro..
a community vote is being held to see if a factory will be built in the community. a survey firm randomly surveyed 180
Mathml equation = $32,000 and mathml equation = $3000. If 100 teachers are randomly selected, find the probability that their mean salary is greater than $32,500.
1. For the period 1998-2008, McDonald's Corpora- tion paid the following dividends (rounded to nearest penny) per share of common stock. Source: McDonald's Corporation, 2005 Annual Report, p. 1; 2008 Annual Report, p. 19.
the width of a confidence interval is defined to be the upper bound of the confidence interval minus the lower bound of
one hundred people participate in a lottery. one will win the grand prize of 1000 and five more will win consolation
If the unit cost of production is $400, unit revenue is $1000, and unit cost of unfulfilled demand is $0, determine the output that maximizes the expected total profit.
What type of sampling was this study? What is your analysis of this approach? What are the advantages and disadvantages of this approach.
Is there a significant difference in mean fetal heart rates by position? Run the test at a 5% level of significance.
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