9. The average weekly expenditure at supermarkets in Ankara in TL follows a normal distribution and...

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9. The average weekly expenditure at supermarkets in Ankara in TL follows a normal distribution and the standard deviation of this normal distribution is 180 TL. A sample of size 18 households have been selected, and the values in the table represent expenditures made at supermarket in Ankara over the past week. 888 635 945 849 937 843 1195 822 780 842 1052 1060 1194 977 1315 874 1081 811 2 a) Determine a 95% confidence interval for the mean weekly expenditures, . Interpret the results. b) At the 0.01 significance level, is it reasonable to conclude the mean cost to process a claim is now more than 1000 TL? Interpret the results. c) At the 0.05 significance level, is it reasonable to conclude the mean cost to process a claim is now 850 TL? Interpret the results. d) Determining the P-Values for (b) and (c) and tests hypothesis again. 9. The average weekly expenditure at supermarkets in Ankara in TL follows a normal distribution and the standard deviation of this normal distribution is 180 TL. A sample of size 18 households have been selected, and the values in the table represent expenditures made at supermarket in Ankara over the past week. 888 635 945 849 937 843 1195 822 780 842 1052 1060 1194 977 1315 874 1081 811 2 a) Determine a 95% confidence interval for the mean weekly expenditures, . Interpret the results. b) At the 0.01 significance level, is it reasonable to conclude the mean cost to process a claim is now more than 1000 TL? Interpret the results. c) At the 0.05 significance level, is it reasonable to conclude the mean cost to process a claim is now 850 TL? Interpret the results. d) Determining the P-Values for (b) and (c) and tests hypothesis again.