Question: For the plasma data in Chapter 1, use the function mat2grp to sort the data into two groups based on whether a participant is male

For the plasma data in Chapter 1, use the function mat2grp to sort the data into two groups based on whether a participant is male or female. Compare these two groups in terms of dietary beta-carotene consumed (labeled BETADIET)

and dietary retinol consumed (labeled RETDIET) using the R function smean2.

Verify that the p-value is 0.258.

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