Find the values of t that bound the middle 0.8 of the distribution for df = 29. (Give your answers correct to two decimal places.) to

Find the t values for each of the following cases. b. Lower tail area of .05 with 50 degrees of freedom

H.: µ = 47.6 and H, : µ < 47.6 where u = the mean age of teachers at Ravenwood High School. The calculated p-value is 0.023. What conclusion will you make at a = 0.10? O Reject the H. O Fail to reject the H. O Reject the H. O Fail to reject the Ha

Fill in the rest of the joint distribution so that X and Y are independent. There are two possible answers: Y 0 1 X=0 1 ? 2/9 2/9

Find the value of t for the t distribution with a sample size of 30 and area in the right tail equal to 0.025 . Round your answer to 3 decimal places.

It is thought that prehistoric Indians did not take their best tools, pottery, and household items when they visited higher elevations for their summer camps. It is hypothesized that archaeological sites tend to lose their cultural identity and specific cultural affiliation as the elevation of the site increases. Let x be the elevation (in thousands of feet) for an archaeological site in the southwestern United States. Let y be the percentage of unidentified artifacts (no specific cultural affiliation) at a given elevation. Suppose that the following data were obtained for a collection of archaeological sites in New Mexico:  x 5.75 6.75 7.75 8.50 9.25 y 27 16 46 62 95 ​ What percentage of the variation in y cannot be explained by the corresponding variation in x and the least-squares line? Round your answer to the nearest tenth of a percent.    3.4%        18.4%        81.6%        9.7%