What is the upper confidence limit for the difference for Question $5?$ Round the answer to one decimal place.

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$666\mathrm{.}3$

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Based on your analysis in questions $5$ and $6,$ select the best answer.

Scheduling flights $30$ days in advance appears to not be an effective strategy to save money because the $99\%$CI would suggest that customers will pay on average at least

$$124\mathrm{.}90$ more by doing so$.$

Scheduling flights $1$ day in advance appears to be an effective strategy to save money because the $99\%$ CI would suggest that customers will save as much as $$746\mathrm{.}40$ by

doing so$.$

Scheduling flights $30$ days in advance appears to be an effective strategy to save money because the $99\%$Cl would suggest that customers will save on average at least

$$124\mathrm{.}00$ by doing so$.$

No determination can be made about the effectiveness of scheduling flights because there are only $14$ values in the data sets.

Scheduling flights $30$ days in advance appears to be an effective strategy to save money because the $99\%$Cl would suggest that customers will save on average at least

$$124\mathrm{.}90$ by doing so$.$

I need help with number $7$ I only added the other two for context, thank you so much!