# Answer to Question #20889 in Statistics and Probability for sandra

Question #20889

A study was conducted to determine the adaptive significance of flower colour

in the scarlet gilia. The question is whether red of white flowered plants are

more attractive to the hummingbird pollinator. The numbers of fruit set in

flowers of the two colours was collected and is given in the following table.

Red White Totals

Fruit Set Yes 85 140 225

No 575 665 1240

Totals 660 805 1465

Below is the output for a X2 test of association.

Chi-Square Test: C17, C18

Expected counts are prjnted below observed counts

Chi-Square contributions are printed below expected counts

CI1 ClB Total

1 85 140 225

101.31 L23.63

2 .642 2 .166

2 515 555 1240

558.63 687.31

0.419 0.393

Totaf 660 805 1465

Chi-Sq : 5.681, DF : I, P-Value 0.017

a) Give the null and alternate hypotheses for a test of association. l2l

b) Tell how the expected value of 101 .37 for the number setting fruit in red

flowers was obtained, not simply the calculation but why it is done that

way, in other words, how it is related

in the scarlet gilia. The question is whether red of white flowered plants are

more attractive to the hummingbird pollinator. The numbers of fruit set in

flowers of the two colours was collected and is given in the following table.

Red White Totals

Fruit Set Yes 85 140 225

No 575 665 1240

Totals 660 805 1465

Below is the output for a X2 test of association.

Chi-Square Test: C17, C18

Expected counts are prjnted below observed counts

Chi-Square contributions are printed below expected counts

CI1 ClB Total

1 85 140 225

101.31 L23.63

2 .642 2 .166

2 515 555 1240

558.63 687.31

0.419 0.393

Totaf 660 805 1465

Chi-Sq : 5.681, DF : I, P-Value 0.017

a) Give the null and alternate hypotheses for a test of association. l2l

b) Tell how the expected value of 101 .37 for the number setting fruit in red

flowers was obtained, not simply the calculation but why it is done that

way, in other words, how it is related

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