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Researchers wondered if the average water temperature of streams without tailed frogs was different than the average water temperature of streams with tailed frogs, which is known to be 12.2 degrees Celsius. A survey of 31 streams without tailed frogs was taken and the water temperature was recorded for each stream. A hypothesis test is to be performed.
Suppose the null hypothesis was rejected at a significance level of 0.10. The power of the test was 0.81.
What type of error could be made and what is the probability of making that error?
The number of newspapers demanded daily in a large metropolitan area is believed to be an approximately normally distributed random variable. If more newspapers are demanded than are printed, the paper suffers an opportunity loss, in that it could..
What inferential statistical tests are appropriate to answer your research question as to whether past participation and contribution will make a difference in people enjoying, and supporting an event?
What statistical method is used to accept or reject the null hypothesis in determining if outsourcing is always beneficial? Please explain your reasons for choosing the selected method in detail and cite references (if any).
The average income of 11 families who reside in a rural area of the Midwest is $60,213, with a standard deviation of $2009. At α =0.05, can it be concluded that the families who live in the cities have a higher income than those who live in the ru..
Plot the dopant concentration profile of a 20" long silicon rod grown by the float-zone technique using P as a dopant in a core doping scheme for various lengths of the floating zone.
(a) Formulate the null and alternative hypothesis for this test scenario. (b) Which test statistic (z or t) is appropriate for this test? Why? (c) Test the validity of the supermarket's belief by conducting a hypothesis test for a single mean. Use ..
How can the binomial distribution be used in a business situation? What type of data would you use and what would you learn from this?
If the desired value for m is 2.5 inches, formulate the appropriate testing hypothesis problem and carry out the test if a = 0.05.
A consensus of experts has agreed on the following table of potential NPVs and their likelihoods for a capital budgeting project that involves considerable uncertainty and is therefore risky:
If the population standard deviation is known to be 7.5 hours, can we conclude at the 5% significance level that he is right?
Explain how the margin of error is reported in the article, and how and why the margin of error impacts the results of the study.
If historical time series data is very limited, what type of forecasting approach would be useful.
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