A manufacturer plans to produce 100 reinforcing steel beams with tensile strength mean of 900 kips to be used in dam construction. Randomly, eight samples were selected and examined to measure the tensile strength to ensure that the design are in accordance with the specifications. The tensile strength of examined samples were: 825, 900, 915, 850, 870, 930, 835, and 885 kips. Determine the confidence interval for the mean of the tensile strength of the beams. [Use 10 % level of significance].
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