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A social workris involved in the study about family structure. She obtains information regarding number of children per family for certain community from census data. Recognize random variable of interest, find out whether is a discrete or continuos, and write its possible values.
Calculate the value based on this information. A new screening test for Lyme disease is developed for use in the general population. The sensitivity (ability to identify infected persons) is 60% and specificity (ability to identify non- infected p..
To be 99% sure that we will not be late in completing the project, what is the requested completion time in work-days?
A medical researcher found a significant relationship among a person's age x1, cholesterol level x2, sodium level of the blood x3, and systolic blood pressure y.
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
If sample of size 10 packages is randomly chosen, and 5 percent rate holds, determine the probability that exactly 2 packages in the sample arrive late?
What is the probability that the drug will be effective for 3 hours or more?
The mean increase is $332, and the standard deviation is $108. Give a 99% confidence interval for the mean amount of the increase. Does omitting the annual fee induce customers to charge more on their credit cards?
Researchers at the Brigham & Women's Hospital recruited 2,000 participants to study the relation between diet and cholesterol.
At one university, the distance to students' home is normally distributed with a mean of 200 miles and a standard deviation of 25 miles.
What percent of the sample means will be greater than 135 but less than 148 seconds? (Round your answer to 2 decimal places.)
What is the probability that none of these crimes will be solved? What is the probability that at least one of these crimes will be solved?
Explain why it might be important to look at cancer incidence that is age-adjusted rather than just cancer incidence. Perform simple linear regression on these data and report your finding.
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