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Paraquat is one of the most widely used herbicides and is highly toxic to animals. In a study to assess the protective effects of a new agent A against paraquat, 200 rats were randomly assigned to three groups. The first group (treatment I) was administered paraquat; the second group (treatment II) was administered paraquat plus a low dose of agent A; the third group (treatment III) was administered paraquat plus a high dose of agent A. The number of rats that survived more than eight days for each group was recorded and are presented in Table 2 1% level of significance, whether agent A affects the survival rate of paraquat infected rats.

Paraquat is one of the most widely used herbicides and is highly toxic to animals. In a study to assess the protective effects of a new agent A against paraquat, 200 rats were randomly assigned to three groups. The first group (treatment I) was administered paraquat; the second group (treatment II) was administered paraquat plus a low dose of agent A; the third group (treatment III) was administered paraquat plus a high dose of agent A. The number of rats that survived more than eight days for each group was recorded and are presented in Table 2 1% level of significance, whether agent A affects the survival rate of paraquat infected rats.

Calculus For The Life Sciences
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter13: Probability And Calculus
Section13.3: Special Probability Density Functions
Problem 30E
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Paraquat is one of the most widely used herbicides and is highly toxic to animals. In a study to assess the protective effects of a new agent A against paraquat, 200 rats were randomly assigned to three groups. The first group (treatment I) was administered paraquat; the second group (treatment II) was administered paraquat plus a low dose of agent A; the third group (treatment III) was administered paraquat plus a high dose of agent A. The number of rats that survived more than eight days for each group was recorded and are presented in Table 2

1% level of significance, whether agent A affects the survival rate of paraquat infected rats.

 

 

a)For the test , how many degrees of freedom does the distribution of the test statistic have?

 

 

 

 

(c) What is the value of the observed test statistic associated with the test ?

 

 

 

 

(d) What is the p-value associated with the test ?

Chi-Square Tests Asymptotic Significance (2-sided) Value df Pearson Chi-Square 7.787* .020 Likelihood Ratio 7.812 .020 N of Valid Cases a. O cells (0.0%) have expected count less than 5. The minimum expected count is 30.36. 200 2. 2.
Transcribed Image Text:Chi-Square Tests Asymptotic Significance (2-sided) Value df Pearson Chi-Square 7.787* .020 Likelihood Ratio 7.812 .020 N of Valid Cases a. O cells (0.0%) have expected count less than 5. The minimum expected count is 30.36. 200 2. 2.
Table 2: Two-way Table of Counts Survived more than 8 days Treatment Yes No Total 25 42 67 II 27 39 66 II 40 27 67 Total 92 108 200
Transcribed Image Text:Table 2: Two-way Table of Counts Survived more than 8 days Treatment Yes No Total 25 42 67 II 27 39 66 II 40 27 67 Total 92 108 200
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