The standard deviation of the number of words in a sentence by students is 3 words. It is believed that the average number of sentences is 17 words. A teacher believes that her students write shorter...

The standard deviation of the number of words in a sentence by students is 3 words. It is believed that the average number of sentences is 17 words. A teacher believes that her students write shorter sentences. She took a sample of 25 students and found that the average for this group is 16 words. Is the teacher correct in believing that her students write shorter sentences? Use α=.05.

True

False