A neighborhood watch group claims the mean speed of drivers through the neighborhood exceeds the posted speed limit of 25 miles per hour. To investigate the neighborhood watch group's claim, which of the following statements is appropriate?
a. The alternative hypothesis states the mean speed of drivers in this neighborhood is greater than 25 miles per hour.
b. The alternative hypothesis states the mean speed of drivers in this neighborhood is less than 25 miles per hour.
c. The alternative hypothesis states the mean speed of drivers in this neighborhood is less than or equal to 25 miles per hour.
d. The null hypothesis states the mean speed of drivers in this neighborhood is less than 25 miles per hour.
e. The null hypothesis states the mean speed of drivers in this neighborhood is greater than 25 miles per hour.
