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Explain the potential problem of the following study and propose an alternative way to prevent the problem.
You want to compare two techniques for weight reduction. You recruit 123 people who are interested in losing weight. You instruct everyone to employ the first technique until they have lost 10 pound
If the sample results show that the 52 of workers belonged to unions, what is the sample proportion of workers belonging to unions (to 2 decimals)?
A University of Florida study upon drinking habits asks random sample of students if they drink any alcohol when they party. We want to extend the results to all students at university. In this prob
The issue of capital punishment is hotly debated topic. Do more Republicans than Democrats support capital punishment? A researcher randomly chooses 100 republicans and 100 democrats and asks them i
Assume that we were going to conduct a study to find out if there is an reduce in risk of getting lung cancer based on whether the person eats strawberries several times a week.
A sporting goods manufacturer is developing the production schedule for two types of tennis racquets. An order has been received for 180 of the standard model and 90 of the professional model.
Which of the following is not true with respect to the residuals in a least squares linear regression? The expected value of the residuals is 0.
A high leverage point is an observation that has an extreme value for which of the following?
The probability that an airplane engine will fail in a transcontinental flight is 0.002. Supposing that engine failures are independent of each other, determine the probability that on a certain tra
A biology quiz consists of eight multiple-choice questions. Five must be answered correctly to receive a passing grade. If each question has five possible answers, of which only one is correct, what
State University has no honors English course but instead places all freshman scoring at least 60 on proficiency exam (mean=50, standard deviation=10) in an advanced composition course. If the score
Let X be a discrete random variable with the probability function fX . Determine formulas for the probability function and distribution function of Y =(X - a)^2, where a is an arbitrary constant
Supposing the true heart disease incidence rate for women with breast cancer is 2.5%, determine the power of this test if the investigators are capable to track 6,000 women with breast cancer? Answe
A newspaper article says that on average, college freshmen spend 7.5 hrs a week partying. One administrator does not believe that these figures apply to her college of nearly 3000 freshmen. She take
One large course has 900 students, broken down in section meetings with 30 students each. The section meetings are led by TA's. On the final, the class avg is 63 and the SD is 20. However, in one se
If X is the normal random variable with standard deviation 4.00, and if the probability that X is more than 5.52 is .1271 (as shown below), then what is the mean of X? (Note: the diagram is not nece
If X is a normal random variable with mean 11, and if the probability that X is less than 12.10 is .72 (as shown below), then what is the standard deviation of X? (Note: the diagram is not necessari
The number of hours college students spend working per week has a normal distribution with a mean of 22 hours and a standard deviation of 6 hours. Determine the percentage of college students who wo
Suppose that 21 year old men's heart rates at rest are normally distributed with a mean of 72 beats per minute. If 600 men are examined, how many would you expect to have a heart rate of less than
The wearout of mileage of a Sparky All Weather tire is normally distributed with a mean of 33000 miles and a standard deviation of 2600 miles.
In an air pollution study performed at the experiment station, the following amount of suspended benzene-soluble organic matter. (in micrograms per cubic meter) was obtained for the 8 different samp
Determine the entire system of policies, procedures, and guidelines established by an organization to achieve and maintain quality called?
With the perfectly balanced roulette wheel, in long run, red numbers must turn up 18 times in 38. To test its wheel, one casino records the results of 3,800 plays determining 1890 red numbers. Is th
One novel procedure of making green gasoline takes biomass in the form of sucrose and converts it into gasoline using catalytic reactions. At one step in a pilot plant process, a chemical engineer m