h of the following, calculate the pooled variance and the estimated standard error for the sample mean difference. ???The first sample has n = 4 scores and a variance of 52 = 55, and the second sample has n = 6 scores and a variance of 52 = 63. ???Now the sample variances are increased so that the first sample has n = 4 scores and a variance of 52 = 220, and the second sample has n = 6 scores and a variance of 52 = 252. ???Comparing your answers for parts a and b, how does increased variance influence the size of the estimated standard error?