In order to determine an interval for the mean of a population with unknown standard deviation a sample of 24 items is selected. The mean of the sample is determined to be 23 . The number of degrees of freedom for reading the t value is
a. 21.
b. 22.
c. 23.
d. 24.
c
RATIONALE: The degrees of freedom for this t distribution is n – 1 = 23.
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