A grocery store is interested in determining whether or not a difference exists between the shelf life of boxes of Hot'n Now doughnuts and Sugar Yum doughnuts. A random sample of 100 boxes of each brand was selected and the mean shelf life in days was determined for the boxes of each brand. A 90% confidence interval for the difference of the means MHN - Msy was determined to be (1.1, 2.4). Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. Based on this sample, we are 90% confident that Sugar Yum doughnuts will last on average between 1.1 and 2.4 days longer than a Hot'n Now doughnuts. Based on this sample we are 90% confident that the interval (1.1, 2.4) captures the difference in the mean shelf life of boxes of Hot'n b Now doughnuts and boxes of Sugar Yum doughnuts. So on average it appears that boxes of Hot'n Now doughnuts have a shorter shelf life than boxes of Sugar Yum doughnuts. C Based on this sample, we are 90% confident that Hot'n Now doughnuts will last on average between 1.1 and 2.4 days longer than Sugar Yum doughnuts. Based on this sample we are 90% confident that the interval (1.1, 2.4) captures the difference in the mean shelf life of boxes of Hot'n d Now doughnuts and boxes of Sugar Yum doughnuts. So on average it appears that boxes of Hot'n Now doughnuts have a longer shelf life than boxes of Sugar Yum doughnuts. e We know that 90% of Hot'n Now doughnuts last between 1.1 and 2.4 days longer than Sugar Yum doughnuts.Does cell phone use while driving impair driver reaction times? At the Univ. of Utah the times (in milliseconds) of32 drivers using cell phones to depress the brake pedal were compared to the reaction times of32 drivers who were listening to the radio. For the cell phone users the results were )'(ba r_{1} : 585.2, 51 = 89.6; for the radio listeners the results were )'(bar_{2} = 533.7, 52 = 65.3. Determine a 95% confidence interval for Lil-H2 where H1 is the mean reaction for drivers using cell phones. Use df= 57. . 51.5 1 2. 51.5 3. 51.5 4. 51.5 |+ 4.49 39.97 55.85 28.27 |+ |+ |+ Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Option 1 b Option 2 c Option 3 d Option 4 A recent study reported that grocery shoppers buy more unhealthy food items when they pay using a credit/debit card than when they pay with cash. In credit/debit food purchases in which 3681 items were purchased, 810 items were unhealthy. In cash food purchases in which 1777 items were purchased, 320 items were unhealthy. Find a 95% CI for pl p2 ,where p1 is the proportion of unhealthy items purchased when using a credit/debit card. 1. 0.04i.0293 2. 0.04 .0108 3. 0.04 .0223 4. 0.04 .0312 |+ |+ |+ Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Option 1 b Option 2 c Option 3 d Option 4