Sampftest – Texas Instruments TI-83 PLUS User Manual

Page 417

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TI-83 Plus

Inferential Statistics and Distributions

414

2

.

Samp

Ü

Test

2

.

Samp

Ü

Test

(two-sample

Û

-test; item

D

) computes an

Û

-test to compare

two normal population standard deviations (

s

1

and

s

2

). The population

means and standard deviations are all unknown.

2

.

Samp

Ü

Test

, which

uses the ratio of sample variances Sx1

2

/Sx2

2

, tests the null hypothesis

H

0

:

s

1

=

s

2

against one of the alternatives below.

H

a

:

s

1

ƒs

2

(

s

1:

ƒs

2

)

H

a

:

s

1

<

s

2

(

s

1:<

s

2

)

H

a

:

s

1

>

s

2

(

s

1:>

s

2

)

In the example:

SAMP4={

7

L

4 18 17

L

3

L

5 1 10 11

L

2}

SAMP5={

L

1 12

L

1

L

3 3

L

5 5 2

L

11

L

1

L

3}

Data

Stats

Input:

,

,

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