Arandom sample of 20 items is selected (from a population with an unknown population standard deviation). when computing a confidence interval for the population mean, what number of degrees of freedom should be used to determine the appropriate t-value?

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

4th option is correct xy=-10

if this was to u plzz mark me the brainliest

nothjing

step-by-step explanation: