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An instructor believes that 20% or less of the students who finish a statistics course get an "A" grade. A sample of 90 students was taken and 25 of the students in the sample received an "A" grade. Test the instructor's claim at a 5% level of significance. What is your conclusion? What is the p-value for this test
in the november 1990 issue of chemical engineering progress a study discussed the percent purity of oxygen from a
Find the z-score for each student and indicate which one has a better relative position. An Art Major earned a grade of 46 on an exam with = 50 and s = 5.
The city of Oakdale wishes to see if there is a linear relationship between the temperature and the amount of electricity used (in kilowatts).
Formulate and solve linear program for determining how many copies should be assigned to each printing firm to minimize the total cost of obtaining 75,000 acceptable-quality reports?
Compute the value of the sample correlation coefficient between weekly sales and shelf space. Is the correlation between weekly sales and shelf space significant at the .01 level of significance? What is the estimated regression equation?
What percent of trucks logged more than 57,060 but less than 58,280 miles? What percent of Fords travelled 62,000 miles or less in the year?
refrigerant 134a undergoes a process for which the pressure-volume relation is p?n constant. the initial and final
Determine the coefficient of correlation between the two variables. Interpret the value.
Suppose that 10 years ago the average annual expense for stock funds was 1.19 percent. Let µ be the current mean annual expense for all stock funds, and assume that stock fund annual expenses are approximately normally distributed.
Whose characteristics can be assume to be independent of each other, were examined. Let X denotes the number of defective computer chips.
In fiscal 1996, the U.S. Agency for International Development provided 238,300 metric tons of corn soy blend (CSB) for development programs and emergency relief in countries throughout the world.
If a person were to be hit by lightning, they have a 33 percent chance of being killed. Find the odds that a person will be killed if struck by lightning.
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