.e. 19-8. A random sample of size 10 has been drawn from a normal population N (u, o') and the obserttions are found to be 60, 62, 63, 64, 65, 67, 68, 69, 70 and 72. Obtain an unbiased estimate of o and a 95% confidence interval of u. Given that upper 2-5% point of t distribution with 9 degrees of freedom is 2-26.

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