1. The standard deviation of the number of minutes of calls ofa certain subscriber is 40 min per day. A sample of 10 days gave a variance of 38 min. Test the hypothesis with a= 0.05 that the standard deviation of the call usage is not equal to 40.

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2. A medical researcher chose a sample of 51 newborn whose temperatures were found to have a variance of 0.49C. At a 0.05, do the data provide sufficient evidence to support the claim that the variance of the temperatures of newborn exceeds 0.36C?

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3. In a certain barangay, 500 random residents are chosen in which 225 are males. At a 0.01, test the hypothesis that more than 35% of the barangay population are male residents.

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