An investigator wants to show that first-born children score higher on IQ tests than second-borns. He takes a simple random sample of 400 two-child families in a school district, both children being enrolled in elementary school. He gives these children the WISC vocabulary test(described in exercise 7 on pp. 507-508) with the following results.The 400 first-borns average 29 and their SD is 10The 400 second-borns average 28 and their SD is 10.(Scores are corrected for age differences) He makes a two-sample z-test:SE for the first-born average=0.5SE for the second-born average=0.5SE for difference = square root of (0.5^2+0.5^2)=0.7z=1/0.7=1.4, p=8%Comment briefly on the use of statistical tests.
Osteoarthritis versus rheumatoid arthritis Essay
Question 1: Describe the diagnostic criteria of osteoarthritis versus rheumatoid arthritis Osteoarthritis (OA) and rheumatoid arthritis (RA) are distinct forms of arthritis, each possessing unique diagnostic criteria. Osteoarthritis, a degenerative joint disease, primarily affects cartilage, the protective tissue cushioning the ends of bones. Its diagnosis often involves a combination of physical examination findings, imaging studies, […]
