Q30. The producers of a new toothpaste claim that it prevents more cavities than

Question

Q30. The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. A random sample of 60 people uses the new toothpaste for 6 months. The mean number of cavities at their next checkup is 1.5, with the standard deviation of 1.20. In the general population, the mean number of cavities at a 6- month checkup is 1.73, with a standard deviation of 1.12. What test should be used for this question? One-sample z-test O Independent-samples t-test One-sample t-test O Dependent-samples t-test

Explanation / Answer

Answer is Independent sample t test. Independent t test is used to find a significant statistical difference in dependent variable of two groups. Here a sample of people who used new toothpaste for 6 months ( experimental group) are compared with general population who didn't use the new toothpaste (control group). The independent variable is the usage of new toothpaste. The dependent variable here is the mean number of cavities.

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