A blogger claims that U.S. adults drink an average of 40 ounces (that's five 8-ounce glasses) of water per day. Researchers wonder if this claim is true, so they ask a random sample of 24 U.S. adults about their daily water intake. A graph of the data shows a roughly symmetric shape with no outliers.
The 90% confidence interval for the mean daily water intake for U.S. adults is 30.35 to 36.92 ounces. Do we have convincing evidence that the amount of water U.S. children drink per day differs from 40 ounces?
• No! We cannot draw any conclusions about the mean amount of water U.S. children drink per day because we only collected information from a random sample of U.S. adults.
• No! We cannot draw any conclusions about the mean amount of water U.S. children drink per day because our sample size is only 24.
• Yes! We can also draw conclusions about the mean amount of water U.S. children drink per day because children always drink more water than the adults do, so it has to be higher than the adults total.
• No! We cannot draw any conclusions about the mean amount of water U.S. children drink per day because the data should include more than just 5 days.
• Yes! We can also draw conclusions about the mean amount of water U.S. children drink per day because it is probably very similar to what the adults drink.
