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what do you call a single value that may refer to a parameter value
A.z-statistic B.t-statistic C.point estimate D. confidence interval

what is a range of values that contains the parameter value
A confidence limits B confidence interval C confidence cooperation D confidence level

what do we call the probability that a parameter is contained in a range of values
A confidence level B. confidence limits C.confidence coefficient D confidence interval.

what is the value resulting from subtracting the maximum error from the sample mean A.point estimate b confidence interval C.lower limit on the confidence interval D upper limit of the confidence interval

When n<30 and the population standard deviation is not Know, What is the appropriate distribution?
A.z B.t C.rD.P