Please help with 2 and 4. Make sure the codes work on R Studios. Thank you!

The built-in dataset ToothGrowth can be accessed in R by typing ToothGrowth. It contains 60 measurements of tooth growth ("len") in guinea pigs during an experiment in 1 which the guinea pigs received vitamin C. One factor in the experiment ("supp") was whether the guinea pigs received vitamin C from orange juice ("OJ") or as an ascorbic acid supplement ("VC"). (There is another column, "dose," but you will not use it in this problem.)

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