Casio FX-9860G 1(Z), Data, List, 1(1-S), Save Res, data type, kZ Interval, Left = o – Z, Right = o + Z, (List 1 to 26), mean of sample, u 1-Sample Z Interval

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Confidence Interval

kZ Intervalu 1-Sample Z Interval

1-SampleZ Interval calculates the confidence interval for an unknown population mean when the population standard deviation is known.

The following is the confidence interval.

Left = o – Z	α		σ
	2
				n
Right = o + Z		α			σ
		2
						n

However, α is the level of significance. The value 100 (1 – α) % is the confidence level. When the confidence level is 95%, for example, inputting 0.95 produces 1 – 0.95 = 0.05 = α.

Perform the following key operations from the statistical data list. 4(INTR)

1(Z)

1(1-S)

The following shows the meaning of each item in the case of list data specification.

Data .............................	data type
C-Level .........................	confidence level (0 < C-Level < 1)
σ ...................................	population standard deviation (σ > 0)
List ...............................	list whose contents you want to use as sample data
	(List 1 to 26)
Freq ..............................	sample frequency (1 or List 1 to 26)
Save Res .....................	list for storage of calculation results (None or List 1 to 26)
Execute ........................	executes a calculation

The following shows the meaning of parameter data specification items that are different from list data specification.

x¯ ..................................	mean of sample
n ..................................	size of sample (positive integer)

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