23.Some researchers have conjectured that stem-pitting disease in peach-tree seedlings might be controlled through weed and soil treatment. An experiment was conducted to compare peach-tree seedling growth with soil and weeds treated with one of two herbicides.

23.Some researchers have conjectured that stem-pitting disease in peach-tree seedlings might be controlled through weed and soil treatment. An experiment was conducted to compare peach-tree seedling growth with soil and weeds treated with one of two herbicides. In a field containing 10 seedlings, five were randomly selected throughout the field and assigned to receive Herbicide A. The remainder received Herbicide B. Soil and weeds for each seedling were treated with the appropriate herbicide, and at the end of the study period the height in (cm) was recorded for each seedling. The following results were obtained:
Herbicide A 87 80 80 76 73
Herbicide B 78 77 74 68 62
A 90% confidence interval for the difference in mean heights for the two herbicides is (0.2, 14.6). Which statement is correct?
a. The P -value for a test of the null hypothesis of equal means and the alternative of different means would be greater than 10% since the interval doesn’t include 0.
b. A 95% confidence could not include zero either, since we would be even moreconfident of a difference in the groups.
c. Both (a) and (b) are incorrect.

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