- 4 1 The Mean Soil Potassium Concentration Was Determined To Be 125 Mg Kg With A Standard Deviation Of 35 Mg Kg For Soil 1 (369.96 KiB) Viewed 14 times
- 4 1 The Mean Soil Potassium Concentration Was Determined To Be 125 Mg Kg With A Standard Deviation Of 35 Mg Kg For Soil 2 (324.68 KiB) Viewed 14 times
4.1. The mean soil potassium concentration was determined to be 125 mg/kg with a standard deviation of 35 mg/kg for soil samples taken from a local golf course. Calculate the confidence limits for this sample for each of the following cases - Be sure to show the calculations needed to solve each problem in the space provided on the Part IV worksheet (2 marks each): a) 95% confidence limits where sample size (n) equals 20. b) Write a brief "plain language" summary of what your calculations in part "a" means. b) 95% confidence limits where sample size (n) equals 40. c) 99% confidence limits where sample size (n) equals 40.
4.2. Answer the following questions based on the results of your calculations from questions 4.1. Your answers should be placed in the spaces provided on the Part IV worksheet. (4 marks) a) If grass grown on golf courses require at least 150 mg/kg potassium to be healthy (but not more than 200 mg/kg), do you think the course manager should use some potassium fertilizer? Why or why not? (2 marks). b) Does the added cost and effort of increasing the sample size to 40 samples help much in answering this question? Why or why not? (2 marks).