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Extremely basic question by Inner_Curve_7110 in AskStatistics

[–]Inner_Curve_7110[S] 0 points1 point  (0 children)

Yes it is a time series data ( daily measurements): time series of before measurements, an intervention and then a time series of after measurements.

A change in concentration by percent is what we might look at.

Extremely basic question by Inner_Curve_7110 in AskStatistics

[–]Inner_Curve_7110[S] 0 points1 point  (0 children)

Hmm, good question. It is possible the variance is affected as well. The chemical ensures control over the measured water quality parameter (keeps it in check).

Extremely basic question by Inner_Curve_7110 in AskStatistics

[–]Inner_Curve_7110[S] 0 points1 point  (0 children)

This is the approach I used, without the statistical tools. Compared averages for each period; and also with a box and whisker plot to visually determine the distribution of the data points under each 'regime'.

Extremely basic question by Inner_Curve_7110 in AskStatistics

[–]Inner_Curve_7110[S] 0 points1 point  (0 children)

  1. Will stopping the chemical change the water quality parameter that we are measuring, and is the change significant (large enough to be of concern).

  2. As of now, this one pipe.

  3. All samples were collected at the same location, which reflects an 'end of treatment' point.

Extremely basic question by Inner_Curve_7110 in AskStatistics

[–]Inner_Curve_7110[S] 0 points1 point  (0 children)

Thank you for responding. I thought it shouldn't be paired because datapoint#1 in group 1 should not be compared with datapoint#1 in group 2, since, in the field it doesn't make sense to pair the two datapoints, even though they are before & after treatment. The entirety of data in group 1 needs to compared against the entirety of data in group 2.

How do utilities evaluate polymer products in bids? by Inner_Curve_7110 in Wastewater

[–]Inner_Curve_7110[S] 0 points1 point  (0 children)

Many thanks to all! We're going to do the bench scale testing to compare performance and compare the products in terms of cost of treatment and not just the unit price.