Question

I. Three of the following are techniques for strengthening the external validity of a study. Which one is NOT?

a. Assure that you have a representative sample.

b. Conduct the study in a real-life setting.

c. Allow flexibility in procedures and instruments.

d. Replicate the study under a variety of relevant conditions.

II. Which of the following is NOT true about the standard error of a statistic?

a. The standard error measures, roughly, the average difference between the statistic and the population parameter.

b. The standard error can never be a negative number.

c. The standard error increases as the sample size(s) increases.

d. The standard error is the estimated standard deviation of the sampling distribution for the statistic.

Answer 1

1) Allow flexibility in procedures and instruments. are not external validity of a study

option C

2) we know that

  

as we see here standard error is inversely propotional to sample size so,So, when we increase sample size then standard error of a statistic decrease given The standard error increases as the sample size(s) increases.so

option C is our required answer

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