A of researchers are interested in differences in stress levels between nurse practitioners and physical group therapists. Arandomly selected group of each was given a survey. The results are below. Nurse Practitioners Physical Therapists n1 = 173 n2 = 109 mean stress score = 77.4 sample standard deviation = 11.06 mean stress score = 77.91 sanple standard deviation = 6.43 Which of the following conclusions is correct? Op<.05; There is NO difference in stress levels between the 2 groups Op<.05; There is a difference in stress levels between the 2 groups Op>.05; There is NO difference in stress levels between the 2 groups Op>.05: There is a difference in stress levels between the 2 groups

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