could you help giving me explanations on this problem ? Thank you

Please use R/Rstudio.

Please conduct any hypothesis test if necessary.

4.18. Suppose that the observation for chemical type 2 and bolt 3 is missing in Problem 4.3. Analyze the problem by esti- mating the missing value. Perform the exact analysis and compare the results.4.3. A chemist wishes to test the effect of four chemical agents on the strength of a particular type of cloth. Because there might be variability from one bolt to another, the chemist decides to use a randomized block design, with the bolts of cloth considered as blocks. She selects five bolts and applies all four chemicals in random order to each bolt. The resulting tensile strengths follow. Analyze the data from this experiment (use o = 0.05) and draw appropriate conclusions. Bolt Chemical 2 3 4 UT 73 68 74 71 67 73 67 75 72 70 75 68 78 73 68 73 71 75 75 69