# 1. (10 marks) A knee surgeon collected data on the post-operative hemoglobin levels (in g/dL) of...

###### Question:

1. (10 marks) A knee surgeon collected data on the post-operative hemoglobin levels (in g/dL) of 102 patients who had total knee replacements. He randomly assigned half of the patients to receive a closed suction drain and half to receive no drain. Of interest is whether post operative hemoglobin levels, on average, differed between the drain and no drain groups The data are available in the file knee.csv. (2 marks) What are the null and alternative hypotheses? b. (1 mark) What is the value of the test statistic? c. ( mark) What is the approximate p-value? d. (2 marks) Using a significance level of a = 0.05, state your conclusions in the language of the problem a key assumptions required for the validity of your hypothesis test e. (4 marks) Describe two and explain why they are reasonable in this setting
"hemoglobin", "group" 8.4, "drain" 8.7,"drain" 10.7,"drain" 9.1, "drain" 9.1, "drain" 10.9, "drain" 9.5, "drain" 7.6, "drain" 8.2, "drain" 8.5, "drain" 10.3, "drain" 9.4, "drain" 9.4, "drain" 9.1, "drain" 8.4, "drain" 11, "drain" 9.5, "drain" 6.8, "drain" 9.8, "drain" 8.5, "drain" 7.8, "drain" 8.8, "drain 7.9, "drain n! 8.3,"drain" 7.1, "drain" 9.9,"drain" 9.2, "dr 7.7, "drain" 10.4, "drai 9.5 aran n" 10,"drain" 10, "drain" 9.9,"drain" 9.8, "drain" 9.6, "drain" 8.9, "drain" 8.7,"drain" 8.6, "drain" 8.2, "drain" 8.8, "drain" 7.6,"drain" 11.4, "drain" 10.3, "drain" 7.8, "drain" 8.6, "drain" 8.5, "drain" 9.9, "drain" 8.9, "drain" 9.3, "drain" 9.1, "no.drain" 9.1, "no.drain" 10.6, "no.drain " 8.9, "no.drain' 10.8, "no.drain" 7.4, "no.drain" 9.7,"no.drain" 9.2, "no.drain" 9.3, "no.drain" 9.5, "no.drain " 8.5, "no.drain " 8.7,"no.drain "

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