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Can we compare gaming on consoles with gaming on computers? Refer to the previous four exercises.
Do you think that you can use the large-sample confidence intervals for a difference in proportions to compare teens' use of computers with teens' use of consoles? Write a short paragraph giving the reason for your answer
Construct a frequency distribution of the sample mean, and plot a histogram of this distribution. Use the central limit theorem to calculate and identify the sampling distribution of the sample mean.
Do the data provide sufficient evidence that mean customer satisfaction differs for the three peak period lengths? Test using α = .05.
In a study, 65 % of the 100 Republicans surveyed, favored the bill for a salary increase and 60 %of the 200 Democrats surveyed, favored the same bill for a salary increase. Test whether the proportions of Republicans and Democrats favoring this bi..
In a survey of 750 senior business executives by Business Week magazine, 56% indicated that they felt that even if merit and abilities are equal, people with MBAs often get promoted faster than people without the degree. Prepare a 92% confiden..
Using this information, calculate Blpha risk (probability of Type II error) if the true population mean really is 79.
(a) Formulate the null and alternative hypothesis for this test situation. (b) Which test statistic (z or t) is appropriate for this test? Why?
Starting with the model in Table 4, add both Em- ployment and Annual Payroll to the model. Does adding this pair improve the fit of the model by a statistically significant amount?
70% of the girls surveyed had used an online social network, compared to 54% of the boys. What does it mean to say that the difference in proportions is significant?
Suppose nothing in this environment changes. a) Compute the probability the mean number of attacks over the next 10 years is between 500 and 600.
Generate a vector x = (x1,..., x10,000) con- sisting of 10,000 random standard Normals. Let y = (y1,..., y10,000) where yi = exi . Draw a histogram of y and compare it to the pdf you found in part (a).
in a hypotheses of h0 mu 7 against the alternative ha mu lt 7 from a normal population with known standard deviation
assume that matched pairs of data result in the given number of signs when the value of the second variable is
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