calculating and plotting 95% confidence intervals

In the attached figure I plot the daily mean hot temperature. Instead of plotting the standard deviation around the mean, I would like to plot 95% confidence intervals around the mean.

I have attached my current code to make this figure.

Thanks in advance!

run average_temp_question

filename = 'temp_treatment_data'

temptreatmentdata = 2247×3 table
             DT              HOT       COLD 
    ____________________    ______    ______

    22-Apr-2022 14:13:36    24.345     25.03
    22-Apr-2022 14:28:36     27.24     27.26
    22-Apr-2022 14:43:36     27.24      27.2
    22-Apr-2022 14:58:36     26.94    26.875
    22-Apr-2022 15:13:36    26.855    27.005
    22-Apr-2022 15:28:36    26.915    27.065
    22-Apr-2022 15:43:36    26.875    27.005
    22-Apr-2022 15:58:36     26.83    27.005
    22-Apr-2022 16:13:36     26.66    26.785
    22-Apr-2022 16:28:36    26.765    26.895
    22-Apr-2022 16:43:36    26.725    26.835
    22-Apr-2022 16:58:36     26.68     26.79
    22-Apr-2022 17:13:36    26.785    26.875
    22-Apr-2022 17:28:36    26.745    26.875
    22-Apr-2022 17:43:36    26.745    26.895
    22-Apr-2022 17:58:36    26.765    26.895

Unable to resolve the name 'DHW.datetime'.

Error in average_temp_question (line 49)
plot(DHW.datetime, DHW.DHWhot,'LineWidth',1.5, 'LineStyle','-','Color','k')

Error in run (line 99)
evalin('caller', strcat(script, ';'));

Answer 1

[Rik]

A 95% confidence interval means 2 standard deviations on either side. So you simply need to insert *2 in your code.

[Sophia]

Thank-you!