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Historically, a certain region has experienced 68 thunder days annually. (A "thunder day" is day on which at least one instance of thunder is audible to a normal human ear) . Over the past seven years, the mean number of thunder days is 58 with a standard deviation of 26. Can you conclude that the mean number of thunder days is less than 68? Use the α = 0.10 level of significance.
Temporary/Permanent
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