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Here is a possible scenario concerning hypothesis testing and the power of the researcher. You are in charge of a research project which has been funded for a little over 2 million dollars with the promise of additional funding of 5 million dollars. The null and alternate hypotheses have been set along with the level of significance at 0.01. After all the testing is completed and the analysis performed, you discover that the null hypothesis was not rejected, and this meant you failed in your testing. Of course, this means no additional funding since the funding was dependent upon a successful completion of the test (i.e., rejecting the null and accepting the alternate). So here is the question, "Is it ok to change the level of significance to 0.05, because at that level you would be able to reject the null and accept the alternate?"
Using α = 0.05, does this sample provide enough evidence to conclude that the average utility bill in Delaware was lower in the winter of 2011-2012 than it was in the winter of 2010-2011?
The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed.
By using the normal probability distribution, what is the probability the car will be repaired in 35 minutes or less?
Each party's position must be statistically sound. Include as suitable graphs, computations, and statistical tests.
The following data represents the running time of films produced by 2 motion picture companies. Assume these are independent samples
It is better to use the median rather than the mean for a distribution when:
Use the normal approximation to find the probability that the student scores 70% or lower on a 100-question test.
An article in Annals of Mathematical Statistics reports the following data on the number of borers in each of 120 groups of borers. Does the Poisson pmf provide a plausible model for the distribution of the number of borers in a group?
A poll found that 38% of male voters and 46% of female voters support a particular candidate. To test whether this candidate has equal levels of support between male and female voters, the null hypothesis should be
What is the slope of the least-squares regression line of final-exam scores on pre-exam total scores in this course? (Use 2 decimal places.)
Decide whether experiment is binomial, Poisson or neither based on info given. Each week man plays game in which he has a 21% chance of winning.
The number of hurricanes that are formed during each hurricane season can be modeled using the Poisson probability distribution.
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