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You are investigating the role of physical activity in heart disease and suggest that physical activity protects against having a heart attack. While presenting these data to your colleagues, someone asks if you have thought about confounders such as factor X. This factor X could have confounded your interpretation of the data if it:
A. is a factor for some other disease, but not heart disease.
B. is a factor associated with physical activity and heart disease.
C. is a part of the pathway by which physical activity affects heart disease.
D. has caused a lack of follow-up of test subjects.
P dollars is invested at annual interest rate r for 1 year. If the interest is compounded semiannualy, then the polynomial P(1+r/2)^2 represents the value of the investment after 1 year.
Pages a user can expect from a print cartridge. A sample of 10 cartridges revealed the following number of pages printed. What is the point estimated of the population mean?
A student conducted a study on the height and weight of adult males. She collected data from 40 adult males and found that average height is 68.34 inches with a standard deviation of 14.02 inches
In the other group 40 out of 80 favored capital punishment. Calculate an appropriate test value to test the hypothesis that the population proportions are the same.
Children toilet train (training age normally distributed) at an average of 26 months with a standard deviation of 2 months. How lilely is child to be trained after 30 months?
The "x" values for red and brown are the counts of each we found on the Data page. You will need to calculate the weighted p?
Standard deviation of 12 years. Worker is stopped at random and asked to fill out questionnaire. Determine the probability that this worker is less than 30 old?
If the rods' lengths produced by your line are normally distributed, with a mean equal to the target of 0.2 meters, and a standard deviation of 0.015m, what percentage of rods will be scrapped?
A normal distribution has a mean of µ = 70 with σ = 12. If one score is randomly selected from this distribution, what is the probability that the score will be less than X = 55?
Scores for men on the verbal portion of the SAT test are normally distributed with a mean 509 and a standard deviation of 112. Randomly selected men are given the Columbia
Below are scores for 10 randomly selected students on each exam. 95% confidence interval for the mean scores on?
Explain the difference between a logarithm of a product and the product of logarithms and give examples of each.
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