An Investigation of the Relationship Between Years of Formal Education

Multiple Choice

An investigation of the relationship between years of formal education and IQ that was conducted with a sample size of 100 found a statistically significant correlation of .25.Another investigation of the same relationship had the same r value based on a sample size of 10,but it was not statistically significant.Why might this be?

A) a sample size of 100 has too much sampling error
B) a sample size of 10 is more likely to produce a Type I error
C) as sample size increases so does the power of the statistic
D) the standard error was larger in the sample where N = 100