15.22. Given x = 79, y = 56, o̟ = 4, 0, = 3 and r (x, y) = + 0.2, find thẻ range of values of x when y = 50
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- Naini, Cobourne, McDonald and Donaldson (2008) reported that a specific ratio of height to face length of 1 to 8.5 tended to be rated as most attractive—almost exactly what Da Vinci’s idealized Vitruvian Man, predicts as “perfection” in the human form. For this study, we want to see if there is a relationship between a person’s height and head circumference. We get a random sample of 40 people and measure both their height and their head size to the nearest centimeter. What test should you use and why?Suppose that “X” represents the name of a disease. An epidemiologist conducts a survey of disease “X” in a population. The prevalence of disease “X” among women is 40/1,000 and among men is 20/1,000. Assuming that the data have been age-adjusted, is it correct to conclude that women have twice the risk of disease “X” as men? Explain.A survey of 90 recently delivered women on the rolls of a county welfare department revealed that 27 had a history of intrapartum or postpartum infection. What is the critical value of z if we need to conclude that the population proportion with a history of intrapartum or postpartum infection is less than 0.25.
- 23. The correlation between the speed of an automobile and the distance travelled for a given length of time is close to 0 negative positive cannot be determinedA doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. ... How many subjects are needed to estimate the mean HDL cholesterol within 2 points with 99% .ASSUMING s=15.7 How does the decrease in confidence affect the sample size required?For SRSWOR (N,n), find the ratio estimator of population mean. Show that the estimator is biased.
- . A student scored 70 on a physics exam where theclass mean is 80 and a SD of 9. He scored 60 on aStatistics exam with a mean of 62 and a SD of 4. Inwhich class his relative position is higher.A random sample of medical files is used to estimate the proportion p of all people who have blood type B. If you have no preliminary estimate for p, how many medical files should you include in a random sample in order to be 99% sure that the point estimate will be within a distance of 0.07 from p?The data for the height of women is approximately bell-shaped. If a woman’s height has a z-score of -1.3, what percentage of women is shorter than she is?