statistics homework help

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Attached are two homework problems that I need help with and I am not understanding it so well. Any questions please let me know. 

unit_7_hw.docx

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Daisy Lopez Psych 4700 February 28, 2016 Modules 19, 20, 21, 22, and 23 Problem Set- Unit 7 Assignment 1 Problem 4 Pg230 In two separate studies, the actual difference between the means of a treated group and an untreated group is 3 points. However, in on study, the 𝜎 𝑚1 − 𝑚2 is very large and so 3 points is not found to be significant. In the other study 𝜎 m1 − m2 is very small and so the 3 points is found to be significant. What might have caused this big difference in the 𝜎 𝑚1 − 𝑚2 for the two studies? Problem 8 Pg231 In a study of the effect of a new drug on the alleviation of asthma symptoms, the σm for the symptom relief in the patient group that received the new drug is 1.45, and the σm for symptom relief in the group that did not receive the new drug 1.22. Calculate the σ m1-m2
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