The producers of a new toothpaste claim

Reference no: EM13510463

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 general population, the mean number of cavities is 1.73 (o = 1.12).
a. Is this a one-tailed or two tailed test?
b. What are Ho and Ha for this study?
c. Compute zobt*
d. What is zcv?

Reference no: EM13510463

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