2. A teacher wants to determine whether the mean reading speed of certain students is
more than 600 words per minute. He took a random sample of seven of the students
who read, respectively, 604, 615, 620, 603, 600, 560, and 610 words in one minute.
[2*3= 6 pts]
a. State null and alternative hypothesis.
b. Are these data good evidence that the average speed of certain students is more
than 600 words per minute? Use the a = 0.05.