Solved: One Standard Deviation Known We sometimes know the
Chapter 9, Problem 29(choose chapter or problem)
One Standard Deviation Known We sometimes know the value of one populationstandard deviation from an extensive history of data, but a new procedure or treatment resultsin sample values with an unknown standard deviation. If s1 is known but s2 is unknown,use the procedures in Part 1 of this section with these changes: Replace s1 with the knownvalue of s1 and find the number of degrees of freedom using the expression below. (SeeThe Two-Sample t Test with One Variance Unknown, by Maity and Sherman, TheAmerican Statistician, Vol. 60, No. 2.) Repeat Exercise 13 by assuming that s = 15 forproctored tests.df =as21n1+ s22n2b2(s22>n2)2n2 - 1
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