For the experimental validity, ther

For the experimental validity, there are a couple of
concerns with internal and external validity. The lack of
control over the variables and the presence of confounding
variables may reduce the internal validity. A series of
rANOVAs was performed to test the influence of
confounding factors. This was done by using different
combinations of single video scores instead of using average
scores of the two identical situations. The results showed
some difference in the statistical significance of interaction
effects that were found, however the main effect of density,
Heavy Goods Vehicles and age the results were still
significant for each combination.

結果 (中文) 3:

对于实验的有效性，有一对夫妇的
与内部和外部效度问题。对
在变量和混杂
变量存在缺乏控制可以减少内部效度。一系列的
ranovas进行测试的
混杂因素的影响。这是通过使用单一的视频分不同的
组合而不是使用平均
做这两个相同的情况下，得分。结果表明
在相互作用
效果，发现一些差异有统计学意义，但密度的主要影响，
重型货车和年龄结果仍然
每个组合的意义。