### Corrections to slides and exercises:

### Statistics lecture 1:

- In the calculation of the variance and the standard deviation
for a population (slide 35) the mean must be represented by the
parameter μ, not by x
(*)
- The calculation of the median (P50) on slide 31
in incorrect. For a correct calculation see this doc.

- In the formula for lambda_sym on slide 36 the factor 2 before
"Total" in the denominator was missing.

## Exercises

- Exercises Week 6:
- Exercise 2: degrees of freedom is 11 (correction added Nov
3).
- All exercises: gave some clarifications on the types of
chi2-tests (added Nov. 4)

- Exercises Week 7:
- some errors in the calculations (missing minus signs) of the
lambda's in Exercises 2 and 3 have been corrected.
- two errors were corrected in Exercise 2 (number in table
"Female"-"Bad Health" was corrected from 84->85; in
calculation of first expected value 341 was corrected to 342)
(correction added Nov 4)

- Exercices Week 8:
- The values for sample size N (and thus also the degrees of
freedom, and the critical F values) were wrong in Exercises 1
and 3.

- Formula for lambda
_{sym} has been added in the section
"chi-2 test".
- The formula for SS
_{within} in the section "ANOVA" has
been corrected.