HP 10413 Datasheet download pdf (Page 154)

154

As before, a more visual display can be seen

in the PLOT view.

Thus the sample data indicates in our two

examples that:

! we can be confident the average number of matches is not 50 with

less than a 5% chance of being wrong, and

! we can conclude, with a confidence of 95%, that the true average

number of matches is between 50.16 and 52.44.

Hypothesis test: T-Test

A farmer compared the 15-day mean weight of two

sets of chicks, one group receiving feed supplement A

and the other supplement C. Twenty two chicks only

one day old were assigned randomly to the two

groups. To distinguish between the two groups of

eleven, which were caged together to minimize other

influences, the heads of the chicks were stained red

and purple respectively with a harmless vegetable

dye. The individual weights were recorded in the

table to the right. From the means at the bottom of

the table it appears that supplement A produces a

higher mean weight. The farmer wishes to know, at

the 1% test level, whether this is statistically

significant.

Our hypotheses are:

: The effects are the same

(

)

: Supplement A is better

()

Enter the data into columns C1 and C2 of the

Statistics aplet.

Weights

Supplement A Supplement C

57 89

120 30

101 82

137 50

119 39

117 22

104 57

73 32

53 96

68 31

118 88

=97

=27.75

=56

=26.54

1 2 ... 149 150 151 152 153 154 155 156 157 158 159 ... 330 331

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HP 10413 Datasheet Page 154

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