A random sample of 14 items is drawn from a population whose standard deviation is unknown. The sample mean is x= 780 the x has a line on top and the sample standard deviation is s = 5. Use appendix d to find the values of students t. a. Construct an interval estimate of u with 98% confidence. Round to 3 decimal places. 98%interval is from____to____ b. Construct an interval estimate of you with 98% confidence, assuming that s =. 10 (round to 3 decimal places) 98% confidence interval is from ____to____ c. Construct an interval estimate of you with 98% confidence, assuming that s = 20 (round your answers to three decimal places.) 98% confidence interval is from____to____

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