Question 123

l. A daily number of accidents reports from day to day. In sample study. the following information was obtained Test the goodness-oft'it of these data to a normal distribution with n= Illl. 2. In the study by Silver and Aiello, a secondary objective was to determine if the frequency of falls was independent of wheelehair use. The following table gives the data for falls and wheelchair use among the subjects of the study. Do these data provide sufcient evidence to warrant the conclusion that wheelchair use and falling are related? Let a = 11.115. 3. Refer to the study by Carter et ah, who investigated the effect of age at onset of bipolar disorder on the course of the illness. One of the variables studied was subjects' family history. Table belottur shoWs the frequency of a family history of mood disorders in the two groups of interest: early age at onset {13 years or younger} and later age at onset {later than 13 years}. Famity history of mood disorder- Can we eonelude on the basis of these data that subjects 18 or younger differ from subjects older than 18 with respect to family histories of mood disorders? Let n = 11.115