The owner of Reliable Furniturestudiedg the relationship between sales (y) and the amount spent on advertising (x). A random sample of 3 homes gives the following information.
(x1) = 12, (yi) = 20, X2=21, y2 = 28, x3 = 26, y3=24
To estimate the regression equation, the slope is equal to
(answer to three decimal places)​

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