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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.
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