A recent study of food portion sizes reported that over a 17-year period, the av
ID: 3058637 • Letter: A
Question
A recent study of food portion sizes reported that over a 17-year period, the average size of a soft drink consumed by Americans aged 2 years and older increased from 13.1 ounces (oz) to 19.9 oz. The authors state that the difference is statistically significant with po.01t Explain what additional information you would need to compute a confidence interval for the increase, and outline the procedure that you would use for the computations. (Select all that apply.) o t and degrees of freedom could be used to find the confidence interval In this case we could compute SEp and use degrees of freedom to find t* O Standard deviations and degrees of freedom could be used to find the confidence interval. In this case we could now find the P-value, which could be used to find SEp O Sample sizes and a more accurate P-value could be used to find the confidence interval. In this case we could determine standard deviations and the confidence interval in the usual way Degrees of freedom and a more accurate P-value could be used to find the confidence interval. In this case we could determine t, then calculate SED and t O Sample sizes and standard deviations could be used to find the confidence interval. In this case we could find the interval in the usual way Do you think that a confidence interval would provide useful additional information? Explain why or why not. O Yes, the confidence interval could give us useful information about the o Yes, the confidence interval could give us useful information about the O No, the confidence interval could give us no more useful information O No, the confidence interval could give us no more useful information o Yes, the confidence interval could give us useful information about the average size of soft drinks magnitude of the difference because the P-value already tells us that the interval does not contain O because it cannot tell us the sample size in the study variability between sample participants in the studyExplanation / Answer
A recent study of food portion sizes reported that over a 17-year period, the average size of a soft drink consumed by Americans aged 2 years and older increased from 13.1 ounces (oz) to 19.9 oz. The authors state that the difference is statistically significant with po.01t Explain what additional information you would need to compute a confidence interval for the increase, and outline the procedure that you would use for the computations. (Select all that apply.) o t and degrees of freedom could be used to find the confidence interval In this case we could compute SEp and use degrees of freedom to find t* O Standard deviations and degrees of freedom could be used to find the confidence interval. In this case we could now find the P-value, which could be used to find SEp O Sample sizes and a more accurate P-value could be used to find the confidence interval. In this case we could determine standard deviations and the confidence interval in the usual way Degrees of freedom and a more accurate P-value could be used to find the confidence interval. In this case we could determine t, then calculate SED and t O Sample sizes and standard deviations could be used to find the confidence interval. In this case we could find the interval in the usual way Do you think that a confidence interval would provide useful additional information? Explain why or why not. O Yes, the confidence interval could give us useful information about the o Yes, the confidence interval could give us useful information about the O No, the confidence interval could give us no more useful information O No, the confidence interval could give us no more useful information o Yes, the confidence interval could give us useful information about the average size of soft drinks magnitude of the difference because the P-value already tells us that the interval does not contain O because it cannot tell us the sample size in the study variability between sample participants in the study