Spatial perception is measured on a scale from 0 to 10. Two groups of 8th grade children are tested for spatial perception. The students in group 1 were first given a short course on spatial concepts. The students in group 2 received no such instruction. R software was used to calculate descriptive statistics for the two samples. Group Statistics Group Std. Std. Error N Mean Deviation Mean Spatial Perception Group 1 8 7.13 1.126 398 Group 2 10 5.10 1.792 .567 What is the value of the pooled standard error? Select one: O a. 0.729 O b. 1.537 O C. 0.483 O d. 0.693