One very perplexing trait is found in the redback spider of australia. During ma
ID: 3173390 • Letter: O
Question
One very perplexing trait is found in the redback spider of australia. During mating, the male performed a somersault maneuver that places the male abdomen directly over the females jaws. the female may consume the male during copulation. In wild populations the male is consumed 65 percent of the time. Males are only eaten while they are in somersault posture and only when the female is hungry. Females in good condition or that have recently fed will not engage in sexual cannabalism. For these studies it is clear if males avoided the somersault position they might also be avoid being eaten. This somersault position is found only in males of this single species and is clearly not necessary for successful for fertilization. From field studies it is also clear that this position is adopted by males and is not influenced or forced by the female so the males seem to be aiding there own death by their position. For a trait to be adaptive it must provide some reproductive benefit, in other words it must Increase increase reproductive success of individuals that possess that trait. one possible explanation is that males increase reproductive success by contributing nutrients to females offspring. One way to examine this is to see if females that are cannibalistic produce larger healthier eggs. the alternative would be that females produce smaller eggs. Some researchers assigned pairs of redback spiders and compared the mass in cannibalistic and non cannibalistic matings.
what below describes the data
paired samples
a single sample
independent samples
binomial proportions
frequencies with multiple categories
a contingency table to test for associations between categorical variables
Is this a one or two tailed test?
identify the test you have chosen
x2 contingency test
two sample ttest
the x2 goodness of fit test
the sign test
binomial proportions test
Mann Whitney test
one sample t-test
Wilcox on ranks test
paired ttest
the Anderson darling test
what is the null hypothesis?
What is the alternative hypothesis?
Explanation / Answer
Solution :-
As in the given situation, way to examine is to see if females that are cannibalistic produce larger healthier eggs. the alternative would be that females produce smaller eggs.
1) What below describes the data - binomial proportions
In statistics, a binomial proportion confidence interval is a confidence interval for a proportion in a statistical population. It uses the proportion estimated in a statistical sample and allows for sampling error. There are several formulas for a binomial confidence interval, but all of them rely on the assumption of a binomial distribution. In general, a binomial distribution applies when an experiment is repeated a fixed number of times, each trial of the experiment has two possible outcomes (labeled arbitrarily success and failure), the probability of success is the same for each trial, and the trials are statistically independent.
2) Is this a one or two tailed test? - It is a one tailed test.
A one-tailed test is a statistical test in which the critical area of a distribution is one-sided so that it is either greater than or less than a certain value, but not both. If the sample that is being tested falls into the one-sided critical area, the alternative hypothesis will be accepted instead of the null hypothesis.
3) Identify the test you have chosen - Binomial proportions test
In statistics, the binomial test is an exact test of the statistical significance of deviations from a theoretically expected distribution of observations into two categories.
4) What is the null hypothesis? - H0 - Females that are cannibalistic produce larger healthier eggs.
H0 - P >=
What is the alternative hypothesis? - Ha - Females that are non-cannibalistic produce smaller eggs.
Ha - P <
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.