O8Pack*?8 @EACT8EACT1$f7܂<@,4$(|TXHԁ Hԁ p t ́  T  ` d ԁ  0 ======060609 =======v2-Sample t Interval 2-Sample t Interval calculates the confidence interval for the difference between two population means when both population standard deviations are unknown. The t interval is applied to t distribution. ThThe following confidence interval applies when pooling is in effect. @ is the level of significance. The value 100 (1@)% is the confidence level. Left=(љ)(t(@2)xpQ(1n1n)) Right=(љ)(t(@2)xpQ(1n1n)) |xpQ=(nљ1)xQڨ2(nҙ1)xQڨ2nщnҙ2 The following confidence interval applies when pooling is not in effect. @ is the level of significance. The value 100 (1@)% is the confidence level TlLeft=(љ)(tdf(@2)(xQnxQn)) Right=(љ)(tdf(@2)(xQnxQn))  `df=1Cnљ1(1C)nҙ1 r&C=xQn(xQnxQn)  @STAT[EXE]8Pack*?( @GUIDE`KEYLOG(4NOTE\'%%222222222xz The following shows the meaning of each item in the case of list data specification. ataData ..... data type C-Level .. confidence level (0C-Level<1)List(1) .. list whose contents you want to use as data of sample 1 (List1 to 26) List(2) .. list whose contents you want to use as data of sample 2 (List1 to 26) Freq(1) .. frequency of sample 1 (1 or List1 to 26) Freq(2) .. frequency of sample 2 (1 or List1 to 26) Pooled ... pooling On (in effect) or Off (not in effect) Save Res . list for storage of calculation results (None or List1 to 26) Execute .. executes a calculation n ....... size of sample 1 n ....... size of sample 2 The following shows the meaning of parameter data specification items that are different from list data specification. The ..... mean of sample 1 xQ .. standard deviation (xQ0) of sample 1 n ..... size (positive integer) of sample 1 ..... mean of sample 2xQ .. standard deviation (xQ0) of sample 2n ..... size (positive integer) of sample 2 @STAT[EXE]8Pack*?( @GUIDEdKEYLOG(8NOTE`0 '%%$2 $2$22222$2222xz$|Left .... confidence interval lower limit (left edge) Right ... confidence interval upper limit (right edge) df ...... degrees of freedom ...... mean of sample 1 ...... mean of sample 2xQ ... standard deviation of sample 1 xQ ... standard deviation of sample 2 xpQ ... pooled sample standard deviation (Displayed only when Pooled: On setting.) n ..... size of sample 1n ..... size of sample 2