A study was concluded that measured the total brain volume in mm3 of patients that had schizophrenia and patients that are considered normal. Table #1 contains the TBV of the normal patients and table #2 contains the TBV of schizophrenia patients (SOCR data Oct2009, 2013)

For the sample from population with mean +u1, determine sample mean and sample standard deviation. Enter sample mean to nearest integer, then comma, then sample standard deviation to nearest integer.

For the sample from population with mean +u2 determine sample mean xz and sample standard deviation sz

Enter the level of significance a used for this interval estimate.

Determine degrees of freedom df

Determine t-score associated with critical value: tc

Determine "error bound of the mean" E

Determine confidence interval estimate of the difference u1-u2

Using the confidence interval, select the most correct description of the result of the survey