4. An agricultural investigator working for ShurGrow Farm Services wants to study the effect of a new formulation of fertilizer on grain stalk height. She grows grain with either traditional fertilizer containing 15 mg of nitrogen or with a new experimental fertilizer containing 25 mg of nitrogen. We know from previous research that the height of grain stalks are normally distributed with o = 5 cm. Measures of central tendency and sample sizes are reported below: perimental Fertilizer Traditional Fertilizer n=25 n=25 M=87cm M=820m a. Sketch a graph that accurately summarizes all the data. Label the axes correctly. (4 points) b. Can the agricultural investigator conclude that grain stalk height produced by the two fertilizers is noticeably different? Explain your answer. (2 points)