Which of the following statements are true concerning the mean of the differences between two dependent samples (matched pairs)? Select all that apply. A. If one has twenty matched pairs of sample data, there is a loose requirement that the twenty differences appear to be from a normally distributed population. OB. The methods used to evaluate the mean of the differences between two dependent variables apply if one has 97 weights of workers from Ohio and 97 weights of workers from New York. C. If one wants to use a confidence interval to test the claim that . > 0 with a 0.01 significance level, the confidence interval should have a confidence level of 98%. OD. The requirement of a simple random sample is satisfied if we have independent pairs of convenience sampling data. O E. If one has more than 20 matched pairs of sample data, one can consider the sample to be large and there is no need to check for normality