Casio fx-9750G PLUS User Manual download pdf (Page 324)

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101

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Example To calculate the 1-Sample Z Interval for one list of data

For this example, we will obtain the Z Interval for the data

{11.2, 10.9, 12.5, 11.3, 11.7}, when C-Level = 0.95 (95% confi-

dence level) and

= 3.

1(List)c

a.jfw

1(List1)c1(1)c1(CALC)

Left ................. interval lower limit (left edge)

Right ............... interval upper limit (right edge)

o ..................... sample mean

n-1 ................ sample standard deviation

n ..................... sample size

u2-Sample Z Interval

2-Sample Z Interval calculates the confidence interval for the difference between

two population means when the population standard deviations of two samples

are known.

The following is the confidence interval. The value 100 (1 –

α) % is the confidence

level.

Left = (o

– o

) – Z

Right = (o

– o

) + Z

o1 : sample 1 mean

o2 : sample 2 mean

1 : population standard deviation

of sample 1

2 : population standard deviation

of sample 2

n1 : sample 1 size

n2 : sample 2 size

Perform the following key operations from the statistical data list.

4(INTR)

1(Z)

2(2-S)

The following shows the meaning of each item in the case of list data specifica-

tion.

Data ................ data type

C-Level ........... confidence level (0 < C-Level < 1)

18 - 7 Confidence Interval

1 2 ... 319 320 321 322 323 324 325 326 327 328 329 ... 485 486

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Casio fx-9750G PLUS User Manual Page 324

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