(a) The standard deviation of y is (Type an integer or decimal rounded to the nearest hundredth as needed.) (b) The variance of y is (Type an integer or decimal rounded to the nearest hundredth as needed.)

ou should complete the table as part of the procedure of finding the variance and standard deviation.   Xi           (Xi-(mu))       | (Xi-(mu)) | 49    53    60    60    62    63    64    69    73    87      [Note, this is the same set of data points used in problem 6. How does this compare to the standard deviation computed in problem 6?  Why might this be smaller?]

Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 7.9 parts/million (ppm). A researcher believes that the current ozone level is at an excess level. The mean of 24 samples is 8.1 ppm with a variance of 0.25. Does the data support the claim at the 0.1 level? Assume the population distribution is approximately normal. Step 5 of 5:  Make the decision to reject or fail to reject the null hypothesis.

A chi square test tells us:  a. Whether two continuous variables are correlated with each other. b. Whether two discrete variables are independent of each other c. The amount of variation in one variable explained by the other d. Which categories of one variable are associated with which categories of the other variable

Suppose the mean and variance of variable X are given respectively by μ = 30.9 and Var(X) =4.4. What is the average of the squared values of variable X?