07 Feb what is the probability
MPH501 Quantitative Methods for Public Health Application Module 3 Quiz Question 1Diastolic blood pressures are assumed to follow a normal distribution with a mean of 85 and a standard deviation of 12. a. What proportion of people have diastolic blood pressure less than 90? b. What proportion have diastolic blood pressures between 80 and 90? Question 2Consider the data described in Problem 1. a. If a sample of 15 participants are sampled, what is the probability that their mean diastolic blood pressure exceeds 90? b. Describe a study you could conduct on this population using one of the qualitative data collection methods you’ve learned about previously. Question 3The following table cross classifies women in the study by their body mass index (BMI) at 16 weeks gestation and whether they had preterm delivery. BMI < 30 BMI 30-34.9 BMI 35+ Preterm 320 80 120 Full Term 4700 480 300 a. What is the probability that a woman delivers preterm? b. What is the probability a women has BMI <30 and delivers preterm? c. What proportion of women with BMI 35+ deliver preterm? d. Are BMI and preterm delivery independent? Justify. Question 4The following table displays the number of children in a local town classified as normal weight, overweight and obese by year in school. Normal Weight Overweight Obese Total Elementary 50 120 80 250 Middle 30 45 45 120 Junior High 50 50 40 140 High School 30 85 85 200 Total 160 300 250 710 a. What proportion of the children are obese? b. What proportion of the normal weight children are in high school? Question 5The following table summarizes data collected in a study to evaluate a new screening test for ovarian cancer. A total of 200 women were involved in the study – 50 had ovarian cancer and 150 did not. The results are tabulated below. Ovarian Cancer Free of Ovarian Cancer Screening Test Positive 28 23 Negative 22 127 50 150 a. Find the sensitivity of the screening test. b. Find the false positive fraction of the screening test. Source: https://www.homeworkjoy.com/questions/education/608016-MPH501-Module-3-Quiz-Latest-2020-January/ © homeworkjoy.com
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