A random sample of 20 items is selected (from a population with an unknown population standard deviation). When computing a conf idence interval for the population mean, what number of degrees of freedom should be used to determine the appropriate t-value?
1 answer:
Answer:
degree of freedom is 19
Step-by-step explanation:
Given data
sample = 20
to find out
degree of freedom
solution
we know degree of freedom formula
that is
degree of freedom = sample -1
we have given sample 20
so
degree of freedom = 20 -1
so degree of freedom is 19
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