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Several hundred students in a variety of introductory statistics courses at a large university were surveyed and asked to report their Math and Verbal SAT scores.
a. Math SAT scores of these students were significantly higher than the reported mean for the university. Can this be attributed to possible bias in the sampling process (these students were not representative in terms of their math skills), or bias in assessing the variable's values (some students "remembered" their scores to be higher than they actually were), or both?
b. Use software to report a 95% confidence interval for mean Math SAT score of the larger population of students from which the sample originated.
is there a relationship between gender and the type of car driven? a random sample of 1000 adults was obtained. the
Is the estimate from the participants significantly higher than the actual number (µ = 3.1)? Use a one-tailed test with = .05.
A rug manufacturer has decided to use seven compatible colors in her rugs. However, in weaving a rug, only five spindles can be used. In advertising, the rug manufacturer wants to indicate the number of different color groupings for sale.
Formulate the hypotheses to test to see if the mean of the population is at least 12 ounces.
1.a manufacturer of infant formula is running an experiment using the standard control formula and two new formulas a
What should the company use as the denominator for the calculation of basic earnings per share for year ended December 31, year 1?
the data on the number of chocolate chips per bag for 42 bags of chips ahoy cookies were obtained by the students in an
What concepts and constructs would you use to study this phenomenon? How might the concepts or constructs relate to explanatory hypotheses? Explain.
A school survey randomly selects 40 seniors; can you report the mean and standard deviation of sample proportion who are married? Explain.
As discussed in Section 5.5, a grammar is in Greibach Normal Form (GNF) if all productions are of the form A→aα, where a is a terminal symbol and α is a string of zero or more grammar (i.e., terminal or nonterminal) symbols.
Perform the test as it should have been done and find if you come to a different conclusion. Explain why the results were different and why your test was a stronger and more reliable test.
A health psychologist wants to test the effectiveness of a new stress-reduction method. In the general population, stress level is normally distributed
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