Discussion:
The producers of a new toothpaste claim that it prevents more cavities than other brands of toothepaste. A random of 60 people used the new toothpaste for 6 months. The mean number of cavities at their next check up is 1.5. In the general population, the mean number of cavities at a 6 month checkup is 1.73 (population mean = 1.12).
a. Is this a one or two tail test?
b. What are Ho and Ha for this study?
c. Compare A obt
d. What is Z cv?
e. Should Ho be rejected? What should fhe researcher conclude?
f. Determine the 95% confidence interval for the population mean, based on sample mean.