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2. 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 poplation, the mean number of cavities at a 6 month checkup is 1.73 (s.d. = 1.12).

Is this a one or two tailed test?
What are the Ho and Ha for this study?
Compute z_obt+
What is Z_cv?
Should Ho be rejected? What should the researcher conclude?
Determine the 95% confidence interval for the population mean, based on the sample mean.

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Applied Statistics, Statistics

Category:- Applied Statistics
Reference No.:- M91255830

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