A researcher wishes to see if a kelp extract helps prevent frost damage on tomato...

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A researcher wishes to see if a kelp extract helps prevent frost damage on tomato plants One hundred tomato plants in individual containers are randomly assigned to two different groups Plants in both groups are treated identically except that the plants in group 1 are sprayed weekly with a kelp extract while the plants in group 2 are not After the first frost in the autumn 8 of the 50 plants in group 1 exhibited damage and 18 of the 50 plants in group 2 showed damage Why would the use of z procedures be questionable value in this situation Select one O a We cannot be sure that the Normality condition has been met O b We don t know whether the 10 condition has been met O c Individual plants were not assigned randomly to the two experimental treatments O d We don t know the standard deviation for either population O e We are collecting results on the entire population of plants so statistical inference from samples is unnecessary

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A researcher wishes to see if a kelp extract helps prevent frost damage on tomato plants One hundred tomato plants in individual containers are randomly assigned to two different groups Plants in both groups are treated identically except that the plants in group 1 are sprayed weekly with a kelp extract while the plants in group 2 are not After the first frost in the autumn 8 of the 50 plants in group 1 exhibited damage and 18 of the 50 plants in group 2 showed damage Why would the use of z procedures be questionable value in this situation Select one O a We cannot be sure that the Normality condition has been met O b We don t know whether the 10 condition has been met O c Individual plants were not assigned randomly to the two experimental treatments O d We don t know the standard deviation for either population O e We are collecting results on the entire population of plants so statistical inference from samples is unnecessary