13. A study of 40 English composition professors showed that they spent, on average, 12.6 minutes correcting a student's term paper. a. Find the best point estimate of the mean.
b. Find the 90% confidence interval of the mean
time for all composition papers when
o= 2.5 minutes.
c. If a professor stated that he spent, on average,
30 minutes correcting a term paper, what would be
your reaction?

Let the mean of the population be 38 instances of from 6" - 9" hatchings per nest, and let the standard deviation of the mean be 3. what sample mean would have a confidence level of 95% or a 2.5% margin of error?

Identify the conclusion of the conditional statement. if you live in phoenix, then you live in arizona.

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)