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The producers of a new toothpaste claim that it prevents more cavities

/in /by

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?
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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