We sometimes know the value of one population standard deviation from an extensive history of data, but a new procedure or treatment results in sample values with an unknown standard deviation If 1 is known but 2 is unknown, use the procedures in Part 1 of this section with these changes Replace s1 with the known value of 1 and find the number of degrees of freedom using the expression below Repeat Exercise 13 by assuming that 15 for proctored tests n2 1

Question: We sometimes know the value of one population standard deviation from an extensive history of data, but a new procedure or treatment results in sample

We sometimes know the value of one population standard deviation from an extensive history of data, but a new procedure or treatment results in sample values with an unknown standard deviation. If Ïƒ1 is known but Ïƒ2 is unknown, use the procedures in Part 1 of this section with these changes: Replace s1 with the known value of Ïƒ1 and find the number of degrees of freedom using the expression below. Repeat Exercise 13 by assuming that Ïƒ = 15 for proctored tests.

n2 1

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