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1. Given the following hypotheses: Ho: 2 45 H: 60 with the following information: n=1600, * = 60.75=30 Test the hypotheses at significance level a -0.10 using p-value approach. 3. A phone industry manager thinks that customer monthly cell phone bill have increased, and now average over SR 80 per month. (Given -9). The company wishes to test this claim and sample results are given below: n=81, i = 81.2. Test the hypotheses at significance level a=0.05. 4. The average cost of a hotel room in Al Kharj is said to be SAR 190 per night. A random sample of 25 hotels resulted in * = SAR 191.5 and s= SAR 5. Test the hypotheses at significance level a 0.95 5. A advertising company claims that it receives 15 % responses from its mailing. To test this claim, random samples of 200 were surveyed with 40 responses. Test the hypotheses at a -0.05