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The producers of a new toothbrush claim that it prevents more cavities than other brands of toothpaste. A random sample of people used the new toothpaste for 6 months. The mean number of cavities at the next checkup is 1.5. In the general population, the mean number of cavities at a 6 month check-up is 1.73 (α - 1.12).
a) Is this a one - or two tailed test?
b) What are H0 and Ha for this study?
c) Compute Z obt.
d) What is Z cv?
e) Should H0 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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Using the sample information given in the above exercise, the p value for testing Ho versus Ha can be calculated to be 0.0057
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To find out whether the course is effective in increasing sales, the appropriate set of hypothesis for testing is:
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A multiple regression equation for list price of homes in certain community in USA is=170,000 -850 X 1 + 28,000 X 2 , where X 1 signifies age in years and X 2 signifies number of rooms.
Utilizing your charts stated whether the filling operation has been in control for every of the 18 operating hours this day.
Temperature in a certain city for the month of June follows a uniform distribution over the interval 61º F to 91º F. What is the probability that a randomly selected June day has a temperature that exceeds 70º F?
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