According to the National Population Health Survey for 1996-97, 28% of those with dental insurance did not have their teeth checked during the survey
Testing a Claim About a Mean, Proportion, Standard Deviation, or Variance

with dental insurance. Test the claim that more than one quarter (25%) of people with dental insurance do not have their teeth checked annually. Use the 0.01 significance level.

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Start St. Dev. σ Use the chi-square distribution with variance o2 or Which parameter does the claim address ProportionUse the normal distribution with p-p where P x/n Pa Mean (p) Use the normal distribution with Is n> 30 Yes No (If σ is unknown, use s instead.) is the distribution of Use nonparametric methods, the population essentiallywhich don't require a normal distribution. See Chapter 13E No normal? (Use a histogram.) Yes Use the normal distribution with scr Yes known a/Vn No This case is rare.] Use the Student r distribution with s/Vn