In the entire week after being totally deprived of sleep for 11 days, Randy Gardner slept a total of about __________ hours more than usual

Most American high-school seniors eat the daily recommended amount of fruits and vegetables

Indicate whether this statement is true or false.

According to the text, carry-over effects are best controlled by:

A) reducing the number of conditions B) making experimental tasks as brief as possible C) varying the order of presentation of conditions D) avoiding tasks that interfere with performance on a subsequent task