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In a nationwide study directed by UMUC Teaching Hospital, 780 persons with stable heart disease were treated. Half of the subjects were treated with drugs and half underwent bypass surgery. After 6 years,351 of those treated with drugs and 359 of those who underwent bypass surgery were still alive.
At the 0.05 significance level, is there sufficient evidence to support the claim that surgery is more effective than drugs? show all work and justify your work.
The UMUC Daily News report that the color distribution for plain M&M's was: 40% brown, 20% yellow, 20% orange, 10 green, and 10% tan. Each piece of candy in a random sample of 100 plain M & M's was classified according to color, and the results are listed below:
In this case use a 0.05 significance level to test the claim that the published color distribution is correct. (show all work and justify your answer).
A regional director responsible for business development in the state of pennsylvania is cocerned about the number of small business failures. If the mean of small businsses failures per month is 10,
Why might driver be tempted not to use seat belt "just on this trip"?
Wheel-Rite has agreed to ship the maximum number of wheel bearings that it produces each day to Itex when an order has been received.
What is the probability that an individual shopper spends between $17.25 and $21.60 on impulse buys?
Within each of your current careers/ jobs, there are sets of data that can be analyzed. For example, a teacher can use a set of test scores, a dietician can analyze a set of patient weights and correlate them to incidences of diabetes, and a sales..
Iit is known that signal change in this brain area is normally distributed with mean of 35 and standard deviation of 10. By using .01 level, what must researcher conclude?
If an applicant is randomly selected, find the probability of a rating that is between 200 and 275.
Determine whether the description corresponds to an observational study or an experiment. Thirty university students are divided into two groups, one group receives free tutoring in mathematics, the other does not.
Which of the following models are appropriate to forecast a time series whose amplitude increases over time?
Create a 95% confidence interval for population mean. Is it sensible that population mean is 28 weeks? give explanation for your answer.
A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years.
a. State the appropriate hypotheses for your significance test. b. Use the sample results to compute the test statistic and the p-value.
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