An experiment was conducted to determine the concentration of a sodium hydroxide solution. The eight repeat measurements

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An experiment was conducted to determine the concentration of a
sodium hydroxide solution. The
eight repeat measurements of the volume of hydrochloric acid
titrated (all in ml) are:
25.8, 26.2, 26.0, 26.5, 25.8, 26.1, 25.8 and 26.3.
Calculate:
(a) Mean (𝑥).,
Formula,
Result:
(b) The standard deviation using the rough-and-ready approach
(σ).
Formula:
Results:
(c) The standard deviation using equation (σ).
Formula:
Results:
(d) The standard error ().
Formula:
Results:
(e) The error in the error:
Formula:
Results: