Selection in Cladocera On the Basis of a Physiological Character
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The 9 same-day broods for this period gave as mean reaction-times 607 and 632 seconds, the difference being -25 ±31. 18 seconds.
A test series was conducted in April 1914. There were 653 individuals of the plus strain and 614 of the minus strain. The mean reaction-times were 666. 4 and 711. 9 seconds. The difference was -45. 5 ±10. 9 seconds, or 4. 17 times the probable error. There is a suggestion of an effect of selection for this year-period in that the data as a whole, the data for the same...-day broods, and the test- series data all show higher reaction-times for the minus strain. But in view of the later data this evidence is overruled.
For the next year-period (August 1914-July 1915) the mean reaction-times (452 and 454 individuals) were 642. 5 and 607. 7. The difference (+34. 8 ±13. 8 seconds) is 2. 52 times the probable error. Hence the difference is of statistical interest, but is opposed to an effect of selection. There were only 3 same-day broods for this year- period for which the mean reaction-times were 834 and 815 seconds.
What to read after Selection in Cladocera On the Basis of a Physiological Character?
You can find similar books in the "Read Also" column, or choose other free books by Arthur Mangun Banta to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The 9 same-day broods for this period gave as mean reaction-times 607 and 632 seconds, the difference being -25 ±31. 18 seconds.
A test series was conducted in April 1914. There were 653 individuals of the plus strain and 614 of the minus strain. The mean reaction-times were 666. 4 and 711. 9 seconds. The difference was -45. 5 ±10. 9 seconds, or 4. 17 times the probable error. There is a suggestion of an effect of selection for this year-period in that the data as a whole, the data for the same...-day broods, and the test- series data all show higher reaction-times for the minus strain. But in view of the later data this evidence is overruled.
For the next year-period (August 1914-July 1915) the mean reaction-times (452 and 454 individuals) were 642. 5 and 607. 7. The difference (+34. 8 ±13. 8 seconds) is 2. 52 times the probable error. Hence the difference is of statistical interest, but is opposed to an effect of selection. There were only 3 same-day broods for this year- period for which the mean reaction-times were 834 and 815 seconds.
What to read after Selection in Cladocera On the Basis of a Physiological Character?
You can find similar books in the "Read Also" column, or choose other free books by Arthur Mangun Banta to read onlineMoreLess
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