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Posted by on Saturday, August 17, 2013 at 8:39am.

According to a genetics model, plants of a particular species occur in the categories A, B, C, and D, in the ratio 9:3:3:1. The categories of different plants are mutually independent. At a lab that grows these plants, 218 are in Category A, 69 in Category B, 84 in Category C, and 29 in Category D.
Does the model look good?
Problem 1

The null hypothesis is:
The model is good.
The model isn't good.
Too many of the plants are in Category C.
The proportion of plants in Category A is expected to be 9/16; the difference in the sample is due to chance.

Problem 2

The alternative hypothesis is:
The model is good.
The model isn't good.
Too many of the plants are in Category C.
The proportion of plants in Category A is expected to be 9/16; the difference in the sample is due to chance.

Problem 3
Under the null, the expected number of plants in Category D is ______.

Problem 4
The chi-square statistic is closest to
1
1.5
2
2.5
3
3.5
4
4.5

Problem 5
Degrees of freedom = _______.

Problem 6
Based on this test, does the model look good?
Yes No

  • Statistics - , Saturday, August 17, 2013 at 12:39pm

    We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.

  • Statistics - , Saturday, August 17, 2013 at 12:40pm

    Problem 1
    The null hypothesis is:
    The proportion of plants in Category A is expected to be 9/16; the difference in the sample is due to chance.

    Problem 2
    The alternative hypothesis is:
    The model is good.

    Problem 4
    The chi-square statistic is closest to
    2.5

    Problem 5
    Degrees of freedom = 3.

    Problem 6
    Based on this test, does the model look good?
    Yes

  • Statistics - , Sunday, August 18, 2013 at 3:56pm

    Problem 3?

  • Statistics - , Sunday, August 18, 2013 at 4:56pm

    Exercise set 5 answers:
    4c51a450.linkbucks

    Note: add dotcom after the word linkbucks

    you're welcome

  • Statistics - , Tuesday, August 20, 2013 at 12:08am

    Thanks, Walter DE

  • Statistics - , Wednesday, August 21, 2013 at 2:30am

    @walter de u link doesn't work

  • Statistics - , Wednesday, August 21, 2013 at 9:52am

    what's the answer?

    Under the null, the expected number of plants in Category D is ______.

  • Statistics - , Wednesday, August 21, 2013 at 1:51pm

    prob 1 - the model is good

  • Statistics - , Thursday, August 22, 2013 at 11:38am

    what's the answer?

    Under the null, the expected number of plants in Category D is ______.

  • Statistics - , Thursday, August 22, 2013 at 5:27pm

    Problem 5
    Degrees of freedom = _______.

  • Statistics - , Friday, August 23, 2013 at 7:07am

    Problem 3, under null is 25 number of plants in Category D.

  • Statistics - , Friday, August 23, 2013 at 11:19am

    thanks

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