, It has been hypothesised that the probability of having an asthma attack on a particular day may vary across the days of the week. Baibergenov et al. (2005) report a longitudinal study in which the number of emergency department admissions due to asthma were recorded in Ontario between April 2001 and March 2004. Suppose the data were as in the table below: Day of attack Number recorded 15456 13811 13228 12786 12446 14228 16837 Mon Tues wed Thur Fri Sat Sun Baibergenova, A., Thabane, L., Akhtar-Danesh, N., Levine, M., Gafni, A., Moineddin, R. and Pulcins, I. (2005): Effect of gender, age, and severity of asthma attack on patterns of emergency department visits due to asthma by month and day of the week. European Journal of Epidemiology 20, No.11, 947-956. Part a) Which graphical method would best display the above data? O A. A bar chart OB. A histogram OC.A stem-and-leaf plot OD. A pie chart OE. A boxplot

Are birthdays "evenly distributed" throughout the year, or are they more common during some parts of the year than others? Owners of a children's toy store chain asked this question. Some data collected by the chain are summarized in the table below. The data were obtained from a random sample of 180 people. The birthdate of each person was recorded, and each of these dates was placed into one of four categories: winter (December 21-March 20), spring (March 21-June 20), summer (June 21-September 20), and fall (September 21-December 20). The numbers in the first row of the table are the frequencies observed in the sample for these season categories. The numbers in the second row are the expected frequencies under the assumption that birthdays are equally likely during each season of the year. The bottom row of numbers gives the following value for each of the season categories. (Each expert I have asked has gotten the critical value wrong so I added a picture of the correct formula to…

A student selects a random sample of 145 students from her large high school. For each student, she records the grade level and their favorite type of pet. She would like to know if there is convincing evidence that grade level is associated with type of pet. Let a = 0.05. The observed and expected counts are displayed in the tables. Observed counts: Pet Dog Cat Bird Other Ninth and Tenth 21 15 8 30 Grades Eleventh and Grade 24 12 11 24 Twelfth Grades Expected counts: Pet Dog Cat Bird Other Ninth and Tenth 23.0 13.8 9.7 27.6 Grades Grade

Are birthdays "evenly distributed" throughout the year, or are they more common during some parts of the year than others? Owners of a children's toy store chain in the Northwest asked just this question. Some data collected by the chain are summarized in the table below. The data were obtained from a random sample of 190 people. The birthdate of each person was recorded, and each of these dates was placed into one of four categories: winter (December 21-March 20), spring (March 21-June 20), summer (June 21-September 20), and fall (September 21-December 20). The numbers in the first row of the table are the frequencies observed in the sample for these season categories. The numbers in the second row are the expected frequencies under the assumption that birthdays are equally likely during each season of the year. The bottom row of numbers gives the following value for each of the season categories. Answer the following to summarize the test of the hypothesis that birthdays are equally…