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Dowsing
A water dowser claims to be able to sense the presence of water using a forked stick. Suppose we wish to set up an experiment to test his ability. We get 20 identical containers, fill some with water, and ask the dowser to tell which ones are full and which empty.
a) How will we randomize this procedure?
b) The dowser correctly identifies the contents of 12 out of 20 containers. Do you think this level of success is statistically significant? Explain.
c) How many correct identifications (out of 20) would the dowser have to make to convince you that the forked-stick trick works? Explain.
Statistician has a data set containing n1 = 7 values of a random variable X and n2 = 6values of a random variable Y . She is interested in using the run test to test the equality ofthe distribution functions.
A study wants to examine the relationship between student anxiety for an exam and the number of hours studied. The data is as follows:
Using the raw measurement data presented below, calculate the t value for independent groups to determine whether or not there exists a statistically significant difference between the salaries of female and male human resource managers.
A scientist wants to estimate the proportion of plants with berries growing in a particular region. They want to be within 6% of the true proportion.
a company is criticized because only 17 of 48 executives at a local branch are women. the company explains that
First, write out the expres- sion for the exact determination of the cut-off point, and secondly, use the CLT for its numerical determination.
Classify the events as dependent or independent - find the probability that he or she owns a credit card given that the student is a freshman. Round your answer to three decimal places.
Compare the percentage found in b) to percentage given by Empirical Rule and Chebyshev's Rule. (Make a table 3 x 3).
Which of the numbers you calculated is a better measure of the central tendency of the heights given? Give a specific statistical reason for your conclusion.
Explain the history behind the Black Soldier of the Civil War In this forum look beyond the book for information on specific units, soldiers and even the reasons for why Lincoln allowed the African American to service in the war.
A psychologist wants to estimate the standard deviation of IQ scores. It is widely believed that IQ scores follow a normal distribution. Her random sample of 30 IQ scores has a mean of 102.3 and a standard deviation of 19.5.
assume that i have a variable with a sample mean 10 and sample n 50. and lets say that the population standard
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