A study was conducted that measured the total brain volume (TBV) (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).  Table #1: Total Brain Volume (in mm3) of Normal Patients 1663407 1583940 1299470 1535137 1431890 1578698 1453510 1650348 1288971 1366346 1326402 1503005 1474790 1317156 1441045 1463498 1650207 1523045 1441636 1432033 1420416 1480171 1360810 1410213 1574808 1502702 1203344 1319737 1688990 1292641 1512571 1635918         Table #2: Total Brain Volume (in mm3) of Schizophrenia Patients 1331777 1487886 1066075 1297327 1499983 1861991 1368378 1476891 1443775 1337827 1658258 1588132 1690182 1569413 1177002 1387893 1483763 1688950 1563593 1317885 1420249 1363859 1238979 1286638 1325525 1588573 1476254 1648209 1354054 1354649 1636119           Let μ1 = mean TBV of patients that are considered normal.  Let μ2 =  mean TBV of patients that had schizophrenia.  Compute a 90% confidence interval for the difference in TBV of normal patients and patients with Schizophrenia. (iv)  Determine degrees of freedom df : Enter value rounded DOWN to nearest integer.   (v)  Determine t - score associated with critical value:  tc Enter in decimal form to nearest thousandth.  Examples of correctly entered answers:  0.0011      0.020     0.500     0.371     2.000   (vi)  Determine "error bound of the mean" E Enter value rounded to nearest integer.

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A study was conducted that measured the total brain volume (TBV) (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). 

Table #1: Total Brain Volume (in mm3) of Normal Patients

1663407

1583940

1299470

1535137

1431890

1578698

1453510

1650348

1288971

1366346

1326402

1503005

1474790

1317156

1441045

1463498

1650207

1523045

1441636

1432033

1420416

1480171

1360810

1410213

1574808

1502702

1203344

1319737

1688990

1292641

1512571

1635918

 

 

 

 

Table #2: Total Brain Volume (in mm3) of Schizophrenia Patients

1331777

1487886

1066075

1297327

1499983

1861991

1368378

1476891

1443775

1337827

1658258

1588132

1690182

1569413

1177002

1387893

1483763

1688950

1563593

1317885

1420249

1363859

1238979

1286638

1325525

1588573

1476254

1648209

1354054

1354649

1636119

 

 

 

 

 

Let μ1 = mean TBV of patients that are considered normal.  Let μ2 =  mean TBV of patients that had schizophrenia.  Compute a 90% confidence interval for the difference in TBV of normal patients and patients with Schizophrenia.

(iv)  Determine degrees of freedom df :

Enter value rounded DOWN to nearest integer.

 

(v)  Determine t - score associated with critical value:  tc

Enter in decimal form to nearest thousandth.  Examples of correctly entered answers: 

0.0011      0.020     0.500     0.371     2.000

 

(vi)  Determine "error bound of the mean" E

Enter value rounded to nearest integer. 

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