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According to CTIA-The wireless association, the mean monthly cell phone bill in 2004 was $50.64.A market researcher believes that the mean monthly cell phone bill is different today, but is not sure whether bills have declined because of technological advances or increased due to additional use. A random sample of 50 cell phone bills taken shows a mean charge of $52.35 and a standard deviation of $3.67. Test to see if the mean cell phone bill has changed since 2004. Use a .05 level of significance for the test.
where the deviations εi are assumed to be independent and Normally distributed with mean 0 and standard deviation σ. This model was fit to the data using the method of least squares. The following results were obtained from statistical software.
Suppose the population standard deviations are not the same. At.05 significance level, is there a difference in mean waiting time?
This model is fit to the data using the method of least squares using statistical software, and the following ANOVA table is obtained
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
The dimension is supposed to be 224 mm and the variability of the manufacturing process is unknown. Is there evidence that the mean dimension is not 224 mm?
How many subjects would you approximately need to reduce the length of the 95% confidence interval to 2 units?
What is the probability that no more than two of the three are commercial successes?
Categorize the following as discrete or continuous random variables.
Such things as historical documents, newspaper reports, TV and radio broadcasts, when used in research, represents
The researcher computes the sum of squares for groups as SSG = 40030 and the sum of squares for error as SSE = 414780. The numerical value of the ANOVA F statistic is
Find the probability that the driver was intoxicated or the pedestrian was not intoxicated?
What percent of trucks logged more than 57,060 but less than 58,280 miles? What percent of Fords travelled 62,000 miles or less in the year?
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