Online Music Industry Stats
Statistics – Two Proportion Z?
Therefore, taking a statistics class and have homework online .. I'm 99% sure I answered correctly (as I said the other problem correctly they were the same but with different rates), but was marked by the program and wanted someone calculate else to confirm my answers. Thanks! A survey of Internet users reported that 19% download music on their computers. Petitioning by the recording industry may be one reason why this percentage has decreased compared to the estimate of 27% from a survey two years earlier. Suppose that are not completely sure about the sizes of the samples. Perform calculations for tests of significance and 95% confidence in each of the following assumptions. (Round your test statistics to two decimal places and their confidence intervals to four decimal places.) (I) The two sample sizes are 1000. z = 95% ___ (___, ___)
A: Test and CI for Two Proportions Sample XN Sample p 1 190 1000 2 270 1000 0.190000 0.270000 Difference = p (1) – p (2) Estimate for difference: -0.08 95% CI for difference: (-0.12, -0.04) test = 0 (vs not = 0) for difference: Z = -4.27 p-value = 0.000
Music Video online research download statistics for record labels
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