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Suppose that you wish to test the effect of lowering the soil ph on the number of lady ferns in an area. The researchers hypothesize that lowering the ph-level of the soil will lead to more ferns. Several plots of forest are randomly chosen and the number of lady ferns counted, before and after the soil has been treated with lime (which lowers the soil ph).
a) Using the sign test, what can be concluded from this experiment?
b) We do not reject the null hypothesis.
c) We reject the null hypothesis.
d) There is no evidence that treating the soil with lime increases the number of ferns.
e) Both (a) and (c)
What is the OR of getting cancer fora late child birth woman compared to an early first birth woman?
Below are scores for 10 randomly selected students on each exam. 95% confidence interval for the mean scores on?
If it is determined that there is no difference between the population mean being represented by the sample and the mean of the population at large, then:
When using the F-statistic for hypothesis testing of the variance, which sample variance is the numerator and which sample variance is the denominator?
Can you explain to me how the null and alternative hypothesis for one-sample testing differs from two-sample testing; and explain how these two hypothesis' are the same. Please provide a numerical example:
A surgical technique is performed on seven patients. You are told there is a 70% chance of success. Find the probability that the surgery is successful for at least four patients.
If the weight distribution is known to be normally distributed, do the data support the veterinarian's suspicion? Conduct a hypothesis test at the 5% significance level. Define your parameter (μ), state your hypotheses, conduct the test and write ..
In a shipment of 52 vials, only 12 do not have hairline cracks. If you randomly select 2 vials from the shipment, what is the probability that none of the 2 vials have hairline cracks?
Scores are obtained from the Law School Admission Test (LSAT) are normally distributed with a mean score of 550 and a standard deviation of 110.
A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following
If life of wild pheasants follows a normal distribution with a mean of 9 months and a variance of 9, what percent of the population will be less than 11 months of age.
Use three decimal places in your answers for this problem. The following table was collected.
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