Measures of Variability - Page 3
Questions
- Why can't variance be negative?
- What is the difference between a sample and population variance?
- Of the range and the standard deviation, which is more widely used in statistical analysis, and why?
- What is the mathematical formula for the variance of a continuous random variable?
- What is the lower bound of a random variable's variance?
- If you are examining the height of a population, how would the variation be affected if everyone is wearing platform shoes that are exactly 3 inches tall?
- What is the symbol for the sample standard deviation?
- What is the formula for the variance of a geometric distribution?
- What is the variance of X if it has the following probability density function?: f(x) = { 3x2 if -1 < x < 1; 0 otherwise}
- Why is variance invariant with regards to translation?
- What are the variance and standard deviation of a binomial distribution with #N=124# and #p=0.85#?
- How does the covariance between two variables affect the variance of their sum?
- How do you find the covariance of a continuous probability density function?
- How do you calculate the covariance between two discrete variables?
- If Corr(X,Y) = 0, does Cov(X,Y) = 0?
- What is a sample covariance?
- What is the difference between a correlation matrix and a covariance matrix?
- Is there a difference between a correlation and a correlation coefficient?
- What is the variance of 10 coin flips?
- What is the difference between the population standard deviation and the sample standard deviation?