Are the observed frequencies variables? what about the expected frequencies? explain your answers. are the observed frequencies variables? explain your answer. choose the correct answer below. a. the observed frequencies are not variables, as they do not vary from sample to sample. b. the observed frequencies are not variables, as they vary from sample to sample. the observed frequencies are variables, as they do not vary from sample to sample. d. the observed frequencies are variables, as they vary from sample to sample. are the expected frequencies variables? explain your answer. choose the correct answer below. a. the expected frequencies are variables, as they are determined by the sample size and the distribution in the null hypothesis. b. the expected frequencies are not variables as they are determined by the sample size and the distribution in the alternative hypothesis. c. the expected frequencies are variables: as they are determined by the sample size and the distribution in the alternative hypothesis. d. the expected frequencies are not variables, as they are determined by the sample size and the distribution in the null hypothesis.