Table 1.2 Summary statistics on samples of students Treatment group (n=30): Control group (n=30): students participate in quiz students participate in quiz with low skilled and with other participants that other participants are students as well Age (years, mean) 24.2 22.1 Male (nr. of students) 20 9 Female (nr. of students) 10 21 Bachelor (nr. of students) 13 22 Master (nr. of students) 17 8 Phd (nr of students) 0 0 Average number of siblings 1.6 1.8 Happiness grade (0-10) 7.5 7.3 Table 1.3 Test of normality: Shapiro-Wilk test Dependent variables P-values overestimation before the quiz 0.014** over-placement before the quiz 0.015** over-precision before the quiz 0.005** overestimation after the quiz 0.376 over-placement after the quiz 0.000** Over-precision after the quiz 0.000** **P-value is significant at 5% significance level. Table 1.6 Descriptive statistics of the dependent variable overestimation before and after the quiz Descriptive statistics overestimation Treatment group Control group Mean before 1.03 0.268 Mean after 0.03 -0.83 Median before 0 1 Median after 0 -1 Minimum & Maximum before -2 & 8 -4 & 3
Table 1.2 Summary statistics on samples of students Treatment group (n=30): students participate in quiz with low skilled and other participants Control group (n=30): students participate in quiz with other participants that are students as well Age (years, mean) 24.2 22.1 Male (nr. of students) 20 9 Female (nr. of students) 10 21 Bachelor (nr. of students) 13 22 Master (nr. of students) 17 8 Phd (nr of students) 0 0 Average number of siblings 1.6 1.8 Happiness grade (0-10) 7.5 7.3 Table 1.3 Test of normality: Shapiro-Wilk test Dependent variables P-values overestimation before the quiz 0.014** over-placement before the quiz 0.015** over-precision before the quiz 0.005** overestimation after the quiz 0.376 over-placement after the quiz 0.000** Over-precision after the quiz 0.000** **P-value is significant at 5% significance level. Table 1.6 Descriptive statistics of the dependent variable overestimation before and after the quiz Descriptive statistics overestimation Treatment group Control group Mean before 1.03 0.268 Mean after 0.03 -0.83 Median before 0 1 Median after 0 -1 Minimum & Maximum before -2 & 8 -4 & 3