An investigator condacts an experiment with four treatment groups. The msponse v

Question

An investigator condacts an experiment with four treatment groups. The msponse vaniable is growth of a plart during the experiment She perlorms a two sample Hest to compare two grosp mears. Wihy might she want to do Choose the comect arewer below O A She did not have enough evidence to neject the null hypothesis from the F-test Theretore, she should do two-sample -ests (wth Bonderrons comection) to compare two group means to determine id hose two groups have O B. She did not have enough evidence to reject the null hypothesis from the F-test Thesefore, she should do two sample t-bests (wth Bonferroni conection) to compane two group mears to determine it those two groups have OC She had evidence to neject the nuil hypothesis from the F test, indicating that at least one group has a diflerent mean growth of plants Perfoming a two sample 1-test (with Bordermoni comection) comparing two group OD. She had evidence to neject the nadl hypothesis from the F-test, indicating that all tour groups have a dfferent mean growth of pliants Perfoming a two sample Hest (with Bonderrons comection) comparing two group mears OE. She had evidence to neject the null bypothesis from the F-test, indicating that at least one group has a different mean growth of plants Performing a two-sample 1-test (with Bonderron comection) comparing hwo group the same average growths of plants different mean growhs of plants means could show id those two groups being compared have different mean would venfy the resuts of the Ftest means could show e those two groups being compared have means derent than the contsol group

Explanation / Answer

Two sample t test after F test is only applied when we reject the null hypothesis of F test that all the means are equal and conclude that atleast one mean is different from others.

Hence,

Option C is correct.

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