improved exercise guidelines in A11La_anova2

improved exercise guidelines for interaction plot in A11La_anova2

A11La_anova2 learnr for module 11

v2020.9.0

new version

improved exercise guidelines in A09Lb_ttest_wmw

improved exercise guidelines for weight loss in A09Lb

A10La_anova learnr for module 10

The learnr A10La_anova is converted into version 2 and integrated into the package

Final tutorials for module 9

final revision of the two learnrs for module 9.

Revised learners for module 9

• A09La_ttest updated to version 2.
• A09Lb_ttest_wmw updated to version 2.

correction of bugs in A08Lb_chi2b

Add to the exercise.setup tabac_table and blood_table

Feedback form added (A99La_avis)

v2020.5.0

"Tutorial" A99La_avis to get feedback added

Revised learners for modules 7 & 8

v2020.4.2

File with long name renamed

Minor changes in A06Lb

v2020.4.1

minor changes in A06Lb