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A survey was conducted two years ago asking college student their top motivations for using a credit card. To determine whether this distribution has changed, you randomly select 425 students and ask each one what the top motivation is for using a credit card. Can you conclude that there has been a chagne in the claimed or expected distribution? Use a =0.025.
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
What sample size is needed to estimate the proportion of Americans who favor tougher gun control with 95% confidence and maximum error of 3%. Assume past studies indicted that the proportion is around 40%.
In a random sample of 80 items, the defect rate is 5% but the manager claims that this is only a sample fluctuation and production is not really out of control. At the 0.01 level of significance, does the data provide sufficient evidence that the ..
What proportion of children 10 to 15 would be classified as hyperlipidemic (assume that hyperlipidemia is defined as a total cholesterol lelvel of 200)?
Scale with a standard deviation of 10. Calculate and interpret the 90 precent confidence interval for the pipulation mean level of satisfaction.
In the graphical method, how do you know when a problem is infeasible, unbounded, or when it has multiple optimal solutions? What are the essential ingredients of an LP model? Why is it helpful to understand the characteristics of LP models?
The data below show the average daily high temperature for Chicago, Illinois, for twelve recent spring and summer months. Create a stem-and -leaf diagram for the data.
A device has a sensor connected to an alarming system. The sensor triggers with probability 0.95 if dangerous conditions exist in a given day and with probability 0.005 if conditions are normal during the day. Days with dangerous conditions occur ..
The sum of two numbers is less then 27. The second number is 7 less then the first. What are the possible values for the first and second number
What is the lowest raw score that a client must have on Anxiety Scale A in order to be admitted into this new group? Also assuming some clinics use Anxiety Scale B and often refer their clients to Mary, what is the cutoff point (lowest raw score) ..
The table given below shows joint probability distribution of X and Y . Determine the covariance between the X and Y ?
In which of the following situations is bootstrapping (and other resampling methods) often used and Which of the following is a valid description of the bootstrapping method.
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