In 2017, a journal reported on trends in sugar-sweetened beverage (SSB) consumption. A random sample of youths aged 12 to 19 years old were asked to monitor all food and beverages consumed in a 24-hour period. The study was done in 2005 and repeated in 2012. The numbers who consumed a sugary beverage such as soda or fruit juice in a day are shown in the accompanying table. Complete parts (a) through (c) below. Consumed SSB Yes No 2005 4413 2012 3602 1281 2092 a. Calculate and compare the percentages of youths in this age group who consumed an SSB during the recording period. The percentage of youth who consumed an SSB in 2005, 77.5%, is greater than the percentage of youth who consumed an SSB in 2012, 63.3 %, so youths aged 12 to 19 in the year 2012 consumed an SSB at a lesser percentage. The difference in percentages (2005 minus 2012) is 14.2%. (Round to one decimal place as needed.) b. Check that the conditions for using a two-population confidence interval hold. The Random and Independent condition holds. The Large Samples condition holds. The Big Populations condition can reasonably be assumed to hold. The Independent Samples condition holds. c. Find the 95% confidence interval for the difference in the proportion of youth consuming an SSB in 2005 and 2012. Based on your confidence interval, do you think there has been a change in sugar-sweetened beverage consumption among this age group? Explain. The 95% confidence interval for the difference (2005 minus 2012) is (☐☐). (Round to three decimal places as needed.)

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In 2017, a journal reported on trends in sugar-sweetened beverage (SSB) consumption. A random sample of youths aged 12 to 19 years old were asked to monitor all food and beverages consumed
in a 24-hour period. The study was done in 2005 and repeated in 2012. The numbers who consumed a sugary beverage such as soda or fruit juice in a day are shown in the accompanying table.
Complete parts (a) through (c) below.
Consumed SSB
Yes
No
2005
4413
2012
3602
1281
2092
a. Calculate and compare the percentages of youths in this age group who consumed an SSB during the recording period.
The percentage of youth who consumed an SSB in 2005, 77.5%, is greater than the percentage of youth who consumed an SSB in 2012, 63.3 %, so youths aged 12 to 19 in the year 2012
consumed an SSB at a lesser percentage. The difference in percentages (2005 minus 2012) is 14.2%.
(Round to one decimal place as needed.)
b. Check that the conditions for using a two-population confidence interval hold.
The Random and Independent condition holds.
The Large Samples condition holds.
The Big Populations condition can
reasonably be assumed to hold.
The Independent Samples condition holds.
c. Find the 95% confidence interval for the difference in the proportion of youth consuming an SSB in 2005 and 2012. Based on your confidence interval, do you think there has been a change
in sugar-sweetened beverage consumption among this age group? Explain.
The 95% confidence interval for the difference (2005 minus 2012) is (☐☐).
(Round to three decimal places as needed.)
Transcribed Image Text:In 2017, a journal reported on trends in sugar-sweetened beverage (SSB) consumption. A random sample of youths aged 12 to 19 years old were asked to monitor all food and beverages consumed in a 24-hour period. The study was done in 2005 and repeated in 2012. The numbers who consumed a sugary beverage such as soda or fruit juice in a day are shown in the accompanying table. Complete parts (a) through (c) below. Consumed SSB Yes No 2005 4413 2012 3602 1281 2092 a. Calculate and compare the percentages of youths in this age group who consumed an SSB during the recording period. The percentage of youth who consumed an SSB in 2005, 77.5%, is greater than the percentage of youth who consumed an SSB in 2012, 63.3 %, so youths aged 12 to 19 in the year 2012 consumed an SSB at a lesser percentage. The difference in percentages (2005 minus 2012) is 14.2%. (Round to one decimal place as needed.) b. Check that the conditions for using a two-population confidence interval hold. The Random and Independent condition holds. The Large Samples condition holds. The Big Populations condition can reasonably be assumed to hold. The Independent Samples condition holds. c. Find the 95% confidence interval for the difference in the proportion of youth consuming an SSB in 2005 and 2012. Based on your confidence interval, do you think there has been a change in sugar-sweetened beverage consumption among this age group? Explain. The 95% confidence interval for the difference (2005 minus 2012) is (☐☐). (Round to three decimal places as needed.)
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