A simple random sample from a population with a normal distribution of 104 body temperatures has X = 98.80°F and s = 0.63°F. Construct a 95% confidence interval estimate of the standard deviation of body temperature of all healthy humans.

(Round to two decimal places as needed.)

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)