Written Assignment for Unit 1 HS 4510 Biostatistics University of the People Instructor: Sonal Patel February 06, 2024
1. Classification of Variables · Number of past road accidents: · History of past road accident: · Heartbeats per minute: · Time taken to complete a race: · Race: · ABO blood type: · Injury severity score: Ratio variable; discrete. Nominal variable. Ratio variable; continuous. Interval variable; continuous. Nominal variable. Nominal variable. Ordinal variable. 2. Inference from Incidence Rate and Prevalence Rates In this scenario, where the disease's incidence rate is seven times greater in women than in men, but the prevalence rates show no sex differences, it can be inferred that women are more likely to acquire the disease at a faster rate than men, possibly due to factors such as biological susceptibility or differential exposure. However, since prevalence rates reflect the total number of cases existing at a given time, the absence of sex differences suggests that the disease doesn't exhibit a significant gender bias in terms of its overall occurrence within the population. 3. Calculation To calculate the expression: 2 v [EXi Yi Zi 2] For the sequences X= {1, -2,4, -2,0,1}, Y= {0.25, -0.5,8,2,2,5}, Z= {2,3,6,3,1,1}, the answer is approximately 67.2607.
4. Analysis of Study Results To calculate the relative frequency of participants for each age group, you can use the formula: Relative Frequency = Total Number of Participants Number of Participants Let's calculate the relative frequency for each age group: 1. For 15 years or younger: Relative Frequency = 10/(10+25+10+2)=10/47~0.213 2. For 16-25 years: Relative Frequency = 25/(10+25+10+2)=25/47~0.532 3. For 26-30 years: Relative Frequency = 10/(10+25+10+2)=10/47~0.213 4. For 31 years or older: Relative Frequency =2/(10+25+10+2)=2/47~0.043 Now, let's add this information into the table: Age Group Number of Participants Proportion of Female Relative Frequency