Which statistic is accurate about lifestyle-related diseases in the U.S?

The Metropollitan Bus Company claims that the mean waiting time for a bus during rush hour is less than 5 minutes. A random sample of 20 waiting times has a mean of 3.7 minutes with a standard deviation of 2.1 minutes. At an   , test the bus company’s claim. Assume the distribution is normally distributed. State the sample mean and standard deviation.

The United States declared war on Japan after the surprise attack on December 7, 1941, on 

(15 points) Evaluate: §#8747;2+xx3+9xdx

Using the problem in number 6. State the Test Statistics.

Using the problem in number 12. State the test statistics.

A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1500 hours. A homeowner selects 40 bulbs and finds the mean lifetime to be 1480 hours with a population standard deviation of 80 hours. Test the manufacturer’s claim. Use alpha equal to 0.05. State the sample mean and the population standard deviation.

Using the problem in number 6. Choose the correct hypotheses.

(15 points) The hyperbolic cosine function is defined as cosh(x)=ex+e-x2. Find the length of the curve  cosh(x)=ex+e-x2 over the interval [0,1].

According to the National Sleep Foundation, how many hours of sleep per night do adults need?