101A_review_for_assessment_one_feb_6_11

# 101A_review_for_asse - Statistics 101A Review for class assessment one Professor Esfandiari Question one A researcher wants to examine the effect

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Statistics 101A Review for class assessment one Professor Esfandiari Question one: A researcher wants to examine the effect of two major classes of antidepressants -MAOIs, SSRIs, on patients with and without sleep disorder (insomnia or lack of insomnia). There are ten medication in class one and ten types of medication in class two. 180 depressed individuals 50% of whom also have insomnia participate in the study. He randomly picks one MAOI and one SSRI. He randomly assigns one third of the patients who suffer from insomnia and one third of those who do not to take either the MAOI selected, the SSRI selected, or a placebo. He measures their level of depression prior to and after taking the medication for six months. a) Identify the independent and the dependent variables. b) Draw a schematic of the data c) What statistical method do you suggest for analyzing the data collected. d) Write the expected values for testing the relevant nulls. Question 2 : The following table was reported in a pediatrics journal for 100 mothers that smoked and 100 who did not smoke. The smoking and non-smoking mothers were similar on other potential confounding factors that could influence the weight of the babies. Average weight at birth Average weight after three months Average weight after six months Average weight after nine months Average weight after twelve months Mother smoked during pregnancy 5 7 10 14 21 Mother did not smoke during pregnancy 7 12 17 22 27 What is the research question asked and what is the underlying design? a)

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## This note was uploaded on 05/02/2011 for the course STAT 101A taught by Professor Mahtashesfandiari during the Winter '11 term at UCLA.

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101A_review_for_asse - Statistics 101A Review for class assessment one Professor Esfandiari Question one A researcher wants to examine the effect

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