An interactive poll found that 380 of 2,400 adults aged 18 or older have at least one tattoo. (a) Obtain a point estimate for the proportion of adults who have at least one tattoo. (b) Construct a 90% confidence interval for the proportion of adults with at least one tattoo. (c) Construct a 99% confidence interval for the proportion of adults with at least one tattoo. (d) What is the effect of increasing the level of confidence on the width of the interval?