# Question

In 2001, 23% of American university undergraduate students had at least one tattoo. A health practitioner suspects that the percent has changed since then. She obtains a random sample of 1026 university undergraduates and ﬁnds that 254 have at least one tattoo. Is this sufﬁcient evidence to conclude that the proportion is different from 0.23 at the α = 0.1 level of signiﬁcance?

## Answer to relevant Questions

Among individuals who have credit cards in 2010, the mean number of cards is 3.5 according to the Federal Reserve Bank of Boston. Treat the individuals who have credit cards in the Sullivan Statistics Survey as a simple ...Politicians often form their positions on various policies through polling. Suppose the U.S. Congress is considering passage of a tax increase to pay down the national debt. National polls suggest the general population is ...A statistics student heard that an individual’s arm span is equal to the individual’s height. To test this hypothesis, the student used a random sample of 10 students and obtained the following data. (a) Is the sampling ...Assume that the populations are normally distributed and that independent sampling occurred. (a) Test the hypothesis that µ1 ≠ µ2 at the α = 0.1 level of signiﬁcance for the given sample data. (b) Construct a 95% ...A researcher wants to estimate the difference between the percentage of individuals without a high school diploma who smoke and the percentage of individuals with bachelor’s degrees who smoke. What sample size should be ...Post your question

0