Which estimator will consistently have a skewed sampling distribution?

coefficient of variation
variance
standard deviation
median

Simply 8x squared + 5(7x squared- x) - 2x =

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables