a researcher has a new treatment for anxiety. the researcher knows that anxiety scores are normally distributed with u = 65 and o = 12. the researcher administers their new treatment to a sample of...

a researcher has a new treatment for anxiety. the researcher knows that anxiety scores are normally distributed with u = 65 and o = 12. the researcher administers their new treatment to a sample of individual and subsequently measures anxiety levels. (a) if the sample size was n = 20 and M = 60 after treatment, can the researcher conclude the new treatment has an effect? justify your response  (b) if the sample size was n = 200 and m = 63 after treatment  can the researcher conclude the new treatment has an effect? justify your response.