There are several alternatives for alleviating so2 pollution from smokestacks in operations using coal as a major fuel source. one is to employ a scrubber that cleans the gases after the coal is burned prior to release. in 50 samples of gases emitted from a stack equipped with a scrubber, the sample mean and sample standard deviation so2 emissions were 0.13 and 0.05 ppm btu, respectively. construct a 95% confidence interval for σ2.

Lv beethoven software supplies customized software to a managed healthcare system. lv beethoven software's costs for the software is $1,723,000. lv beethoven software sells the software to the healthcare system for $3,816,981.10. overhead expenses are estimated at 47% of the selling price. what is lv beethoven software's net profit to the nearest dollar?

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.

Aquadrilateral has exactly 3 congruent sides davis claims that the figure must be a rectangle why is his claim incorrect.