Question: x1, . . . ,xn i.i.d. normal distribution with mean u and b variance , and u is unknown and b is known. How large

x1, . . . ,xn i.i.d. normal distribution with mean u and b variance , and u is unknown and b is known. How large n must be in order that there will be a 98% confidence interval for u with length less than 0.3 b^1/2?

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