We know that teenagers (ages 12 to 17) are much more likely to use instant messaging online than adults (ages 18 and older). How much more likely? A simple random sample of Internet users found that 736 out of 981 teens and 511 out of 1217 adults use instant messaging online. What procedure should be used to estimate the difference in proportions of teenagers and adults  who use instant messaging online? Group of answer choices One-sample z test of significance for a proportion One-sample z confidence interval for a proportion Two-sample t test of significance for means One-sample t test of significance for a mean Two-sample z confidence interval for proportions Two-sample z test of significance for proportions One-sample t confidence interval for a mean Two-sample t confidence interval for means

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