Mrs. Campbell is often awakened by the howling of dogs in the neighborhood. She wonders whether the

Question:

Mrs. Campbell is often awakened by the howling of dogs in the neighborhood. She wonders whether the dogs howl more often on rainy nights. During one particularly rainy month, she counts how many separate incidents of howling she hears per night and also records whether the night is rainy or clear. The data are as follows:

a. Calculate t and compare it with the one-tailed critical t at the .01 a level. Does rain significantly increase the number of howling incidents?
b. Think: Why would a second rater/counter be advisable for this study?