The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. A random sample of 60 people use the new toothpaste for 6 months. The mean number of cavities at their next check up is 1.5. In the general population the mean # of cavities after a 6 month check up is 1.73 (@= 1.12).

a) is it 1 or 2 tailed test? (I think one- tailed)

b) What are the Ho and Ha for this study? I think:

Ho: µ = µ1 or µ cavities from new toothpaste= cavities any other brand toothpaste

Ho: µ0>µ1 or µ cavities from new toothpaste> µ cavities with any other brand toothpaste

Ha: µ0<µ1 or µ cavities from new toothpaste<µ cavities with any other brand toothpaste

c) Compute Zobt -I don't know how

d) What is Z cv?- Also don't know.

e) Should Ho be rejected (I think yes)

f) Determine the 95% confidence interval for the population mean

Subject | Mathematics |

Due By (Pacific Time) | 05/10/2015 10:00 pm |

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