An aquatic ecologist wants to know whether the dissolved oxygen in a stream is impacted by the presence of a small waterfall. They take multiple measurements of the dissolved oxygen in water above the waterfall and compare these with measurements of dissolved oxygen below the waterfall. Use the dataset below and R to calculate $95\%$ confidence intervals around the two means. You may also wish to sketch the confidence intervals on a sheet of paper.

Click here to download the dataset.

What is the mean dissolved oxygen above the waterfall? Answer to $2$ decimal places.

$5\mathrm{.}02$

What is the mean dissolved oxygen below the waterfall? Answer to $2$ decimal places.

$6\mathrm{.}97$

What is the upper confidence interval of dissolved oxygen above the waterfall? Answer to $2$ decimal places.

$5\mathrm{.}08$

What is the lower confidence interval for dissolved oxygen below the waterfall? Answer to $2$ decimal places.

$6\mathrm{.}91$

Is there strong evidence to suggest that the the presence of the waterfall increases the dissolved oxygen in the stream?

$($Answer with "Yes" or $"$No$")$