Treating bean plants: In a study to measure the effect of an herbicide on the phosphate content of bean plants, a sample of 75 plants treated with the herbicide had a mean phosphate concentration (in percent) of 3.52 with a standard deviation of 0.41. and 100 untreated plants had a mean phosphate concentration of 5.82 with a standard deviation of 0.52. Construct a 95% confidence interval for the difference in mean phosphate concentration between treated and untreated plants.