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The high temperatures for a random sample of 7 days in July in southwestern Pennsylvania are listed below: 85 86 90 93 77 81 88

The high temperatures for a random sample of 7 days in July in southwestern Pennsylvania are listed below:

85 86 90 93 77 81 88

At = 0.10, is there sufficient evidence to conclude that the standard deviation for high temperatures is less than 10 degrees?

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