7-10-8

Confidence Intervals

Calculation Result Output

Left : interval lower limit (left edge)

Right : interval upper limit (right edge)

o : sample mean

xσn–1 : sample standard deviation

n : sample size

Example

list1 : { 1.6, 1.7, 1.8, 1.9 }

Significance level : 5% ( = confidence level : 95%)

•Statistics Wizard Operation

(1)Input the data into [list1] in the Stat Editor.

(2)On the menu bar, tap [Calc] and then [Interval].

(3)Select [One-Sample TInt] and then tap [Next >>].

(4)Input value.

(5)Select List [list1] and Freq [1].

(6)Tap [Next >>].

uProgram, eActivity or Main Application

Command: OneSampleTInt

Command Syntax

Syntax 1 (list format)

C-Level value, List, Freq (or 1)

*“Freq” can be omitted. Doing so sets “1” for “Freq”.

Syntax 2 (parameter format)

C-Level value, o value, xσn−1 value, n value

Input Example:

Syntax 1 (list format)

OneSampleTInt 0.95,list1,1

Syntax 2 (parameter format)

OneSampleTInt 0.95,66.3,8.4,12

2-Sample t Interval

Menu: ������������[Interval]-[Two����-������Sample �����TInt]

Description: This command obtains the confidence interval for the difference between two population means when the population standard deviations are unknown.

The confidence interval is obtained using the following expressions. The confidence level is 100 (1 – α)%.

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