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What is an independent sample? What is a related sample? When should researchers use different hypothesis tests for independent and related samples
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead
College Athletics: Graduation Rate. Women Athletes at the University of Colorado Boulder have a long term graduation rate of 67%.
It is asserted that a greater proportion of males (= x 1 ) contribute to charity than females (= x 2 ).
You are curious about whether the professors and students at your school are of different political persuasions, so you take a sample of 20 professors
What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. What is the value of the sample test statistics?
For the hypothesis test, , with n1 = 10 and n2 = 10, the F-test statistic is 2.56. At the 0.01 level of significance, we would reject the null hypothesis.
A study conducted by the research department of a pharmaceutical company claims that the annual spending (per person) for prescription drugs for allergy relief
Past records suggest that the mean annual income,of teachers in state of Texas is greater than or equal to the mean annual income,of teachers in Virginia.
Finance: P/E of Stocks. The price to earnings ratio(P/E) is an important tool in financial work. A random sample of 14 large U.S. banks gave the following P/E
Is the water on your airline flight safe to drink? It is not feasible to analyze the water on every flight, so sampling is necessary
Suppose that we observe a random sample size n from a normally distributed population. If we are able to reject H0:µ = µ in favor of a two-tailed alternative
A sample of 50 provided a sample mean of 19.4. The population standard deviation is 2.
Supposed we wish to test H0: µ = 10 vs. H1: µ > 10 at the a = 0.05 significant level. Furthermore, supposed that we observe values of the sample mean
A cereal manufacturer wants to determine if the filling machine is operating to specifications. The machine is specified to fill to a 12oz level.
Under what circumstances should a nonparametric test be used? Explain. What are the strengths and weaknesses of nonparametric tests
What is meant by the "normal distribution? What is its relevance in statistics?
For each of the following pair of null and alternative hypotheses, determine whether the pair would be appropriate for a hypothesis test.
Using the confidence interval when conducting a two-tail test for the population mean we do not reject the null hypothesis if the hypothesized value
For a simple random sample , n= 700 and p= 0.63. At the 0.025 level, test H0: p = 0.60 versus H1: p:0.60 (pthis symbol represents Pi)
During 2002, college work - study students earned a mean of $1252. Assume that a sample consisting of 45 of the work-study students at a large university
Use a 0.05 significance level to test the claim that the heights of female supermodels vary less than the heights of women in general.
The Stewart Aviation Products Company uses a new production method to manufacture aircraft altimeters.
A local newspaper alleges that workers at my brother's café have an extremely stressful job. Stresses come from a combination of physical and social sources
Analysis of Last Digits Analysis of the last digits of sample data values sometimes reveals whether the data have been accurately measured and reported