Self-test 3.6

1. A graph with distribution functions is given. Which line corresponds to which distribution function? Please choose the respective color.

Which line corresponds to which distribution function:

a) Rectangular distribution orangeredgreenvioletdark blueyellowlight blue

b) Triangular distribution dark blueorangegreenredvioletyellowlight blue

c) Normal distribution yellowredorangevioletgreenlight bluedark blue

d) Student distribution violetyellowredgreenlight blueorangedark blue

2. Cu content in drinking water was determined and the results are:

Please calculate the half-width of the confidence interval at 95% probability for the arithmetic mean of copper concentrations found in a drinking water sample. Please give the answer with 2 significant digits and don't forget correct unit!

Please calculate the confidence interval at 95% probability for the arithmetic mean of copper concentrations found in a drinking water sample.

A. Please present here the lower limit of the 95% confidence interval with the same number of significant digits that is the initial data.

B. Please present here the higher limit of the 95% confidence interval with the same number of significant digits that is the initial data.

Here are some clues!