Is Daphnia a predator?
Typical predators for Daphnia are the phantom midge larvae Chaoborus, the heteropteran Notonecta sp. or small fishes26,27,28. In the presence of fish predators, Daphnia react with an earlier sexual maturity, an increased fecundity and the production of resting eggs26,29,30.
How do Daphnia avoid predators?
Daphnia are also able to avoid predators in a process called cyclomorphosis in which they change their size and shape in order to be a less suitable foodsource. Their size is often predator specific as they become larger or smaller to avoid consumption by the many types of fish which use Daphnia as their primary food.
Who eats water fleas?
Water Fleas are eaten by the fierce larvae of Damselflies and Aquatic Beetles (especially Dytiscid beetle larvae). Other major predators of Water Fleas are the Backswimmer, Water Boatman and the larvae of the Phantom Midge.
Is there convincing evidence that the mean tail spine length of water fleas is longer in the presence of fish Kairomones?
Conclude: Since the P-value is much less than any conventional value for a, we reject H0: we have strong evidence that the mean length of Daphnia pulicaria tail spines in the presence of fish kairomones is longer than when the kairomones are absent.
Is there significant evidence that the mean hemoglobin level is higher among breast fed babies?
Therefore we conclude that there is no strong evidence in the data that the mean hemoglobin level of the breast-fed infants is higher than that of the formula-fed infants. 2.
When can you employ T procedures?
Except in the case of small samples, the assumption that the data are a simple random sample from the population of interest is more important that the population distribution is normal. For sample sizes less than 15, use t procedures if the data are close to normal.
Which of the following conditions for performing a paired t test are clearly satisfied?
Which of the following conditions for performing a paired t test are clearly satisfied? the data come from a well-designed random sample or randomized experiment. the population distribution be exactly Normal. the data contain no outliers.
Is it appropriate to analyze these data using T procedures?
Solution: It is appropriate to analyze these data using the t procedure since the data is symmetric and roughly normal without any outliers.
Which of the following is the appropriate test of the city planners hypothesis?
matched pairs t-test
Which of the following increases the power of a significance test?
Using a larger sample provides more information about the population and, thus, more power. Using a larger sample is often the most practical way to increase power. Using a higher significance level increases the probability that you reject the null hypothesis.
Which of the following descriptions of those dot plots would suggest that it is safe?
Which of the following descriptions of those dot plots would suggest that it is safe to use t-procedures? moderately skewed left. Both dot plots are strongly skewed to the right. There are no outliers.
When the manufacturing process is working properly?
When the manufacturing process is working properly, NeverReady batteries have lifetimes that follow a slightly right-skewed distribution with u = 7 hours. A quality control supervisor selects a simple random sample of n batteries every hour and measures the lifetime of each.