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In 2000, 23% of American undergraduates had at least one tattoo. However, a health practitioner suspects...

In 2000, 23% of American undergraduates had at least one tattoo. However, a health practitioner suspects that the percent has changed since then. She obtained a random sample of 1,026 undergraduates and find that 254 of them have at least one tattoo.

a. What is the null hypothesis and alternative hypothesis?

b. What is the standardized test statistic?

c. Is this sufficient evidence to conclude that the proportion is different from 0.23 at 5% significance level?

Math   Statistics-And-Probability   
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