private void setMediumInformation() {
        textDifficultyHeader.setText(R.string.difficulty_medium);
        textDifficultyDescription.setText(R.string.difficulty_medium_description);
        textValueMaxWave.setText(PreferenceManager.getStatisticsValue(PreferenceManager.Statistics.MEDIUM_MAX_WAVE));
        textValueEnemiesKilled.setText(PreferenceManager.getStatisticsValue(PreferenceManager.Statistics.MEDIUM_ENEMIES_KILLED));