Assume that the claim of the manufacturers of alloy B is true, that is, . Find approximate distributions for and in terms of using the central limit theorem. (b) Under the same assumption , find an approximate distribution of the difference in the sample means, . Use the fact that the measurements for the 30 specimens of alloy A are independent of those for the 30 specimens of alloy B. (c) Find the probability that the difference in sample means is 4 or greater under the assumption that . (d) Based on the probability found in (c), do you think these data strongly support that alloy A is superior than alloy B

Which expression is not a polynomial?

Apoll is being conducted at a mall nothingto obtain a sample of the population of an entire country. what is the frame for this type of​ sampling? who would be excluded from the survey and how might this affect the results of the​ survey? what is the frame for this type of​ sampling? a. the frame is people who need new clothes. b. the frame is people who shop at the mall. c. the frame is people who like to shop. d. the frame is the entire population of the country. who would be excluded from the survey and how might this affect the results of the​ survey? a. any person that does not need new clothes is excluded. this could result in sampling bias due to undercoverage. b. any person who does not shop at the mall is excluded. this could result in sampling bias due to undercoverage. c. any person who does not shop at the mall is excluded. this could result in nonresponse bias due to people not participating in the poll. d. there is nobody that is being excluded from the survey.

B. two events are dependent if the occurrence of one event changes to occurrence of the second event. true or false