a)  Left-tailed test for a mean, α = 0.04  and σ is known. …

a)  Left-tailed test for a mean, α = 0.04  and σ is known.               The critical value is  _______ b)  Two-tailed test for mean, α = 0.05, σ is unknown. and n = 16,               The critical values are  _______ and _______ c)  Right-tailed test for proportion where α = 0.06.               The critical value is  _______ d)  Left-tailed test for a variance where α = 0.01 and n = 20               The critical value is  _______ e)  A two-tailed test for standard deviation where α = 0.10  and n = 15               The critical values are  _______ and _______

A real estate agent claims that the standard deviation of th…

A real estate agent claims that the standard deviation of the rental rates of apartments in a certain county is greater than the national standard deviation of $78.  A random sample of 9 rates is shown below.  At α = 0.05, can the claim be refuted? $600 $550 $405 $550 $410 $440 $420 $670 $400 Hint: You will need to find the value of s2 in order to carry out this hypothesis test.  Show your work in finding this value! Write your conclusion in the space below.  It should take the form:”There is/is not enough evidence to support/reject the claim that …… “