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

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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 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.

 

Paper#61651 | Written in 18-Jul-2015

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