Independent random samples of size 40 are drawn from two quantitative populations, producing the sample information in the table. Sample 1 Sample 2 Sample Size 40 40 Sample Mean 13 9 Sample Standard Deviation 7 9 Find a 95% upper confidence bound for the difference in the two population means (pl #2). (Round your answer to two decimal places.) : You may need to use the appropriate appendix table or technology to answer this question. Independent random samples of n, = n, = n observations are to be selected from each of two populations 1 and 2. If you wish to estimate the difference between the two population means correct to within 0.11 with probability equal to 0.90, how large should n, and n2 be? Assume that you know of2 2 62 ~ 23.5. (Round your answer up to the nearest whole number.) LO USE SALT n 1 observationsA random sampling of a company's monthly operating expenses torn : 36 months produced a sample mean of $5,671 and a standard deviation of $769. Find a 90% upper confidence bound for the company's mean monthly expenses. (Round your answer to two decimal places.) $: You may need to use the appropriate appendix table or technology to answer this question. Canadians are becoming more conscious of the importance of good nutrition, and some researchers believe that we may be altering our diets to include less red meat and more fruits and vegetables. To test this theory, a researcher decides to select hospital nutritional records for subjects surveyed 10 years ago and to compare the average amount of beef consumed per year to the amounts consumed by an equal number of subjects she will interview this year. She knows that the amount of beef consumed annually by Canadians ranges from D to approximately 45 kg. How many subjects should the researcher select for each group if she wishes to estimate the difference in the average annual pericapita beef consumption correct to within 2.8 kg with 99% confidence? (Round your answer up to the nearest whole number.) Suppose you wish to estimate the difference between the mean acidity for rainfalls at two different locations, one in a relatively unpoiiuted area and the other in an area subject to heavy air pollution. If you wish your estimate to be correct to the nearest 0.2 pH, with probability near (190, approximately how many rainfalis (pH values) would have to be included in each sample? [Assume that the variance of the pH measurements is approximately 0.2 at both locations and that the samples will be of equal size. Round your answer up to the nearest whole number) You may need to use the appropriate appendix table or technology to answer this