Casio CLASSPAD 330 3.04 - Manual (Page 444)

20090601
Confidence Interval Command List
I Z Confidence Interval
1-Sample Z Interval
Menu: [Interval]-[One-Sample ZInt]
Description: This command obtains the confidence interval for the population mean when
the population standard deviation is known.
The confidence interval is obtained using the following expressions.
Lower =
o – Z

2

n
Upper =
o + Z

2

n
A is the significance level, and 100 (1 – A)% is the confidence level. When the
confidence level is 95%, for example, you would input 0.95, which produces
A = 1 – 0.95 = 0.05.
Definition of Terms
C-Level : confidence level (0  C-Level < 1)
σ :
population standard deviation (σ > 0)
List : list where sample data is located
Freq : frequency of sample (1 or list name)
M : sample mean
n : sample size (positive integer)
Calculation Result Output
Lower : interval lower limit (left edge)
Upper : interval upper limit (right edge)
M : sample mean
s
x
: sample standard deviation (Displayed only for list format.)
n : sample size
Example 1 (calculation with list)
list1 : { 299.4, 297.7, 301, 298.9, 300.2, 297 }
Population standard deviation : 3
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 ZInt] and [List], and then tap
[Next
>>].
(4) Input values.
(5) Select List [list1] and Freq [1].
(6) Tap [Next >>].
7-10-2
Confidence Intervals