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Before installing a high-tech laser exhibit near the exit area, a museum of American technology found the average contribution by patrons was $2.75 per person. For a sample of 30 patrons following installation of the new exhibit, the contributions are as listed in data file XR10108.
Based on the sample data, and using the 0.025 level of significance, can we conclude that the new exhibit has increased the average contribution of exhibit patrons? Identify and interpret the p-value for the test.
How large a sample should be taken if the desired margin of error E is:
What proportion of the patients do you expect to be obese, assuming normality? Find the Cp index and establish a 95% lower confidence interval.
Find the probability (type answer as an integer or simplified fraction) of a couple having a baby boy when their fifth child is born, given that the first four children were all boys.
A recent survey of 50 executives who were laid off durning a recent recession revealed it took a mean of 26 weeks for them to find another position. The standard deviation of the sample was 6.2 weeks. Construct a 95 percent confidence interval for..
In a sample of 210 men, 35 prefer sugar free soft drinks. In a sample of 220 women, 42 prefer sugar free soft drinks. Using a significance level of 0.05, test whether women prefer sugar free drinks more than men. Calculate the p-value.
computed using a Binomial Distribution
Scenario Analysis: Computer Chips - use analysis guidelines in helping (let me know if more information is needed, but this is all we are given)
As it is a 2 × 2 table, try also two-tailed two-sample z test for π 1 = π 2 and verify that z 2 is same as your chi-square statistic. Which test do you prefer? Explain why?
you are told that the population of the scores of iq test takers is normally distributed has a population mean of 100
At the 10% level of significance, is there sufficient evidence to indicate that more books are being loaned out per day, on the average?
A food processor wants to know whether the probability is really 0.60 that a customer will prefer a new kind of packaging to the old kind. If, in a random sample, 7 of 18 customers prefer the new kind of packaging to the old kind, test the null h..
A psychologist is interested in knowing whether adults who were bullied as children differ from the general population in terms of their empathy for others.
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