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consider the following statement. which of them are true? select all that may apply. a. the Paired Difference t Procedure can be used to determine

consider the following statement. which of them are true? select all that may apply.

a. the Paired Difference t Procedure can be used to determine if the means of two independent populations are the same.

b. the Central Limit Theorem cannot apply to the Paired Difference t Procedure, since the population of interest is a population of mean difference.

c. the Welch Approximate t Procedure is only valid when the populations under comparison are normally distributed

d. inference procedures for two means that use the standard normal distribution are only valid if the population standard deviations are known.

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