Casio FX 1.0 PLUS, FX 2.0, FX 2.0 PLUS u1-Prop Z Interval

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Confidence Interval (INTR)

u1-Prop Z Interval

1-PropZ Interval uses the number of data to calculate the confidence interval for an unknown proportion of successes.

The following is the confidence interval. The value 100 (1 – α) % is the confidence level.

α

n : size of sample

x

1

x

x

Left =

– Z

1–

x : data

n

2

n

n

n

α

Right =

x

+ Z

1 x

1–

x

n

2

n

n

n

Perform the following key operations from the statistical data list.

4(INTR)

b(Z)

d(1-Prop)

Data is specified using parameter specification. The following shows the meaning of each item.

C-Level ........................	confidence level (0 <C-Level < 1)
x ..................................	data (0 or positive integer)
n ..................................	size of sample (positive integer)
Save Res .....................	list for storage of calculation results (None or List 1 to 20)
Execute .......................	executes a calculation

After setting all the parameters, align the cursor with [Execute] and then press the function key shown below to perform the calculation.

• 1(CALC) ... Performs the calculation.

Calculation Result Output Example

Left ..............................	interval lower limit (left edge)
Right ............................	interval upper limit (right edge)
pˆ ..................................	estimated sample proportion
n ..................................	size of sample

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