μ = the population mean speed (mph) of trucks in a specificregion in Greeley, CO. A random sample of 8 trucks has a samplemean speed of 25.4 mph and the population standard deviation isknown to be 3.2 mph. Find the 95% confidence interval for μ.
a.) (23.18, 27.62)
b.) (12.68, 18.70)
c.) (24.08, 30.05)
d.) (18.80, 24.56)
What is the required sample size if you want an error margin forthe 95% confidence interval for μ to equal 0.8 mph?
a.) 62
b.) 60
c.) 58
d.) 64
