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# Exercise 1 12 no solution

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### Exercise 1 12 no solution

1. 1. Exercise 1: Types of variablesCategorize the following variables into either numerical, or categoricalvariables.Age, sex, race, residency, occupation, years of formal education,cigarettes smoking. No. of cigarettes smoked per day, weight, height,hemoglobin, anemia, educational level of mother (whether primary,secondary, college), coffee drinking, No. of cups of tea drunk/day, bloodsugar, blood group, Rh, blood urea, serum sodium.Exercise 2: Designing a questionnaire form.The teacher starts by writing the title of the questionnaire on theblackboard e.g. “Prevalence of smoking habit among medical students inErbil”Then continue by writing each variable (and give some valuablecomments during writing). E.g.Rank:Name (optional):Age (years):Gender: 1. Male 2. FemaleCollege: 1. Medical college 2. Dentistry college 3. Pharmacy CollegeGrade:Smoking: 1. Yes 2. NoIf yes: No. of cigarettes/day:Type of smoking: 1. Cigarettes 2. Arjeela 3. others (specify)………After that the teacher ask the students to continue by suggesting morerelated variables and ask them about their types..Lastly the teacher opens the Exel worksheet and give the students an ideaabout how to enter the numerical variables, and giving codes forcategorical variables. He writes the names of variables on first row thenenter the data starting from second row.
2. 2. Exercise three:Simple random sampling using random number table.Requirements: Random digit table.Question:- Use the random digit table to select 50 students out of 250students.- What do you call this type of sampling.Exercise 4. Systematic random samplingQuestion:Choose 50 students out of 200 students. Mention all steps in details.Exercise 5. Stratified samplingQuestionOne thousand employees (office and manual workers) of an enterprisewere composed of 600 males and 400 females. Use a stratified randomsampling method to collect a sample of 50 males and 50 females.Exercise 6. Cluster samplingQuestionUse the cluster sampling method to choose a representative sample ofIraqi primary school students.Exercise 7The following are body weight in Kg for 50 students.Q) Present the data in an order array. 50 82 99 78 59 77 67 79 72 93 55 68 78 99 78 98 56 72 75 94 88 95 78 66 68 92 95 74 74 95 67 71 56 67 89 78 94 59 73 77 45 70 55 78 56 45 56 78 72 83
3. 3. Exercise 8: The frequency distribution tablePresent the following data (marks of students) in a frequencydistribution table: 50 82 99 78 59 77 67 79 72 93 55 68 78 99 78 98 56 72 75 94 88 95 78 66 68 92 95 74 74 95 67 71 56 67 89 78 94 59 73 77 45 70 55 78 56 45 56 78 72 83Exercise 9: Measures of central tendency and dispersionFor the following data (Blood urea in mg/dl), calculate measures ofcentral tendency, and measures of dispersion, then present the data in aproper way or ways.42 44 30 78 56 30 60 4041 67 50 35 65 64 49 7378 56 56 37 72 66 45 49Exercise ten: The normal distributionQuestion 1Suppose that the mean (+sd) of the marks of students is 70 + 2 and theirdistribution is normal.1.What is the percentage of students whose marks are more than 70?2. What is the percentage of students whose marks are less than 70?3. What is the percentage of students whose marks are between 68 and72?4. What is the percentage of students whose marks are between 70 and72?5. What is the percentage of students whose marks are more than 72?6. What is the percentage of students whose marks are less than 72?7. What is the percentage of students whose marks are more than 74?8. What is the percentage of students whose marks are less than 66?9. What is the percentage of students whose marks are more than 76?10. What is the percentage of students whose marks are less than 64?
4. 4. Question 2Calculate the 95% and 99% confidence interval for the population mean.Use the mean and sd of question 1. The sample size is 100.Exercise 11. The Chi square testIn a study to determine whether there is an association between type oftherapy and outcome in mental illness, a group of 120 mental patientswere given drug and another group of 120 mental patients were givendrug and psychotherapy. The outcome of all patients was registered asdeteriorated, unchanged, or improved. In the first group, 6 of them weredeteriorated and 49 patients were improved. While in the second group,31 patients were unchanged and 78 patients were improved. At level ofsignificance 0.05, do these data provide evidence that psychotherapy iseffective measure in treatment of mentally ill patients?Exercise 12: The t testQ1: The following values represent SGOT readings (in IU/Liter) of 20patients affected with liver disease. If you know that the mean SGOT ofthe population from which the sample of patients was drawn is 42IU/Liter. Is there significant difference from the mean of normalpopulation?Let alpha = 0.05 34 35 37 40 42 46 46 47 48 49 50 50 55 56 56 56 62 63 65 70Q2: The weight in gm of two groups of new-born infants was measured.Mothers of the first group were regular attendants of antenatal careclinics, while mothers of the second group had no history of suchattendance.Group1 (Antenatal care)3000 3500 4000 3200 3150 2950 4100 3750 3450 3200Group2 (No Antenatal care)2700 2450 2500 2000 2200 2100 2300 2450 2600 2250Do these data provide evidence that antenatal care affect the weight ofnew-born infants. Let alpha = 0.01Q3. Eight jaundiced newborns were subjected to phototherapy. Do thesedata provide evidence that phototherapy affect bilirubin level?Bilirubin mg/dl before Bilirubin mg/dl after phototherapy
5. 5. phototherapy15 618 914 1425 2617 520 617 416.5 3.5