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 g
Mathematics
sreward2447
Question
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. What is the value of the pooled standard error
1 Answer

1. User Answers akiran007
Answer:
Pooled Standard Error =0.7157
Stepbystep explanation:
The missing data is
Mean n Std. Deviation Std. Error
group1 6.89 9 1.269 0.423
group2 5.33 9 1.732 0.577
Standard Error= Std. Deviation / √n
First we calculate pooled standard deviation from the pooled variance formula
Sp²= (n1 – 1)* (s1)² + (n2 – 1) *(s2)²/(n1 + n2 – 2)
= 8*(1.269)² + 8 (1.732)²/ ( 9+92)
= 12.882888 + 23.998592/16
=2.3050925
Sp = √ 2.3050925 =1.51825
Pooled Standard Error = Sp *sqrt(1/n1 + 1/n2)
=1.51825 *(0.4714)
=0.7157