D Question 1 3 pts When calculating the test statistic for a one sample t test, the denominator term in the formula is the estimated SEM O the estimated standard error of mean differences O the mean difference O the deviation score D Question 2 3 pts A clinical psychologist conducts a study comparing two types of therapy for schizophrenia. He treats two different groups of patients with one of the therapies and measures their symptoms. The first sample has n = 10 patients, while the second sample has n = 7. What degrees of freedom (df) value does he use to find the critical cutoff t value from the critical cutoff t table? O 15 O 17 O 15 7 and 10