Question

Most of us (and dentists too) believe that brushing teeth results in fewer cavities. If you...

Most of us (and dentists too) believe that brushing teeth results in fewer cavities. If you were to test a hypothesis concerning the number of cavities for people who brush their teeth at least two times daily versus the number of cavities for individuals who do not brush at all,

  • what would your null hypothesis be?
  • what would your research hypothesis be?
Math   Statistics-And-Probability   
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Answer #1

Solution:

For the given research scenario, the null and alternative hypotheses are given as below:

Null hypothesis: H0: The average number of cavities for people who brush their teeth at least two times daily is same as the average number of cavities for individuals who do not brush at all.

Alternative hypothesis: Ha: The average number of cavities for people who brush their teeth at least two times daily is less than the average number of cavities for individuals who do not brush at all.

In symbolic form, the null and alternative hypotheses are given as below:

H0: µ1 = µ2 versus Ha: µ1 < µ2


[Claim is an alternative hypothesis.]

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