Hey! I need help with this two-part question:

a) Using R as a calculator to do the "by-hand" calculations (means to show the steps as if you were solving by hand) to test the claim that the population means sepal length for iris species virginica is different than the observed sample mean sepal length for iris species versicolor, using a 5% significance level. Check your answer using an R function call. [Hint: you are using the mean sepal length for the versicolor species as a constant]. (1 hypothesis; 1 by-hand calculation, 1 R output; 1 reporting required numbers; 1 decision; 1 interpretation in context) b) Test the claim that the population means sepal width for the iris species versicolor is different than the population mean sepal width for the virginica species, using a 5% significance level. Assume the population variances are not equal. [do this problem using an R function only, meaning no by-hand calculations are necessary] (1 hypothesis, 1 R output; 1 reporting required numbers; 1 decision; 1 interpretation in context)

Any help is appreciated; thanks!