The manager for a radio station wants to estimate the mean length of all songs published after
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The manager for a radio station wants to estimate the mean length of all songs published after 1960. How many songs should be in the sample if we want 99% confidence that the sample mean is within 15 seconds of the population mean? Use the range rule of thumb to estimate σ, assuming that the shortest and longest songs are 1.5 minutes and 12 minutes long.
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