Math Solutions

(Solution Library) The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. A random sample of 60 people

Question: The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. A random sample of 60 people used the new toothpaste for 6 months. The mean number of cavities at their next checkup is 1.5. In the general population, the mean number of cavities at a 6-motnh checkup is 1.73 (σ + 1.12).

A- Is this a one- or two-tailed test?

B- What are Ho and Ha for this study?

C- Compute zobt.

D- What is zcv ?

E- Should Ho be rejected? What should the researcher conclude?

F- Determine the 95% confidence interval for the population mean, based on the sample mean.

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