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According to the Center for Disease Control (CDC), 49.4% of American adults 18 years old and over meet their Physical Activity Guidelines for aerobic physical activity. The owners of a gym want to know if the proportion of their members who meet these requirements is different from the national proportion given by CDC. They take a random sample of 40 members and 28 meet the CDC's guidelines. At 1 % level of significance, is there sufficient evidence that the proportion of their members who meet these requirements is different from the national proportion given by CDC? (Define the parameter of interest, state the null and alternative hypotheses, compute the value of the test statistic and the p-value, state your decision and give the conclusion in the context of the study)
What is an interaction? Describe an example; what are the variables within your population (work, social, academic, etc.) for which you might expect interactions?
raul received a score of 80 on a history test for which the class mean was 70 with standard deviation 10. he received a
customers are used to evaluate preliminary product designs. in the past 95 of highly successful products received good
a nonprofit company concerned with the school dropout rates in a nearby stats has designed a tutoring program at
according to a survey 90 of senior executives at major u.s corporations felt that the federal budget will not be
thickness measurements of a coating process are made to the nearest hundredth of a millimeter. the thickness
An entomologist writes an article in a scientific journal, which claims that fewer than 7 in ten thousand male fireflies are unable to produce light due to a genetic mutation. Use the parameter p, the true proportion of fireflies unable to produce..
Sketch the distributions involved, and (c) explain your answer to someone who is familiar with the t test for a single sample but not with the t test for independent means.
suppose that the demand for a companys product in weeks 1 2 and 3 are each normally distributed and the mean demand
What are the implications for building a requisite model of the current car-purchase decision if trading in the car is treated as an uncertain event? As a decision?
If the campaign manager's claim is correct, what is the probability that the sample proportion would be no more than 0.49 for a sample of this size? Based on your answer to part (a), speculate on whether the campaign manager's claim might be mistak..
Those who have quit smoking often return to the habit. The authors of a paper concluded that forbidding smoking in the smoker's residence was a significant predictor of the ability to abstain from smoking.
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