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Plasma glucose levels are used to determine the presence of diabetes. Suppose the mean in (plasma-glucose) concentration (mg/dL) in 35-44 year olds is 4.86 with standard deviation = 0.54. A study of 100 sedentary people in this age group is planned to test whether they have a higher or lower level of plasma glucose then the general population.
If the expected difference is 0.10 units, then what is the power of such a study if a two-sided test is to be used with a=.05. How many people would need to be studied to have 80% power under these assumptions?
Let X1 and X2 denote the proportion of two different chemicals found in a sample mixture of chemicals and used as an insecticide. Suppose X1 and X2 have the joint probability density function given by:
Provided that the selected student excels in sports, determine the probability that the student is a boy?
Based on a sample of 49 students, Healthy Lifestyles Incorporated (HLI) would like to apply the central limit theorem to ma ke various estimates. a) Compute the standard error of the sample mean. (Round your answer to 2 decimal places.)
The probability of getting a promotion and a raise is 0.25. What is the probability of getting a raise.
Which two types of probability sampling are best suited for business research and statistical data analysis, and why?
In a group of six professors selected at random, what is the expected number of extroverts? What is the standard deviation of the distribution?
Critically discuss the Central Limit Theorem? How large should the sample size be if the underlying distribution of the population values are:
Find the probability that the amount of total claims over a period of 100 days is at least $150,000. (Use the fact that the sum of independent normally distributed random variables is normally distributed, with mean equal to the sum of the individ..
You will investigate four different scenarios of population growth also decline in this town. Graph the model as well as investigate it by four different growth models.
Test for significant differences among weight losses for the five diets, and perform all pair wise comparisons using:
Research question: Are the mean crash damages the same for these three vehicles?
A random sample of 7 students selected from a large class revealed the following scores: midterm 70, 62, 57, 68, 89, 63, 82 and on the final 80, 79, 87, 88, 85, 79, 91. Is there evidence of an improvement on the final?
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