It took me awhile to understand Type I and Type II errors. I have it now, although the double negatives can still be confusing. My favorite way to explain them is an adaptation from Rosnow & Rosenthal’s boxes in which Type I is gullibility and Type II is blindness. I describe the situation of suitors – each one is giving me flowers, candy, and claiming their undying devotion. I find that when I accept Suitor A’s proposal I become very disappointed because I was gullible (and made a Type I error) because in actuality he had been giving flowers, candy etc to three other women. So, having been burned by this, I reject Suitor B eventhough his claims of devotion are true. I remain blind to his love and spend the rest of my life in isolation (or a convent).

I don’t know if this actually helps, but the story remains in student’s memories.