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Solving quadratic equations
Discriminant of a quadratic equation
Compute the value of the discriminant and give the number of real solutions to the quadratic equation.
7x^2 - 8x + 5 = 0
A random sample of 200 workers from Factory A showed that 130 were satisfied with their job. Formulate and test the appropriate hypotheses at the 1% level of significance
Construct the 90% confidence interval for the true population proportion of all voters in the state who favor approval.
U.S. News & World Report publishes the average starting salary and the average GMAT score for MBA graduates at each of the top 80 ranked schools in the country.
Decision rule which chooses alternative associated with smallest maximum opportunity loss is?
Suppose that you are conducting a survey of customer satisfaction regarding their cellular phone. If you called 11 households selected at random, what is the probability that:
Concept of statistical signi cance
A woman has a collection of snakes and iguanas. Her young son observed that the reptiles have a total of 50 eyes and 56 feet. How many reptiles of each type does the woman have?
Would the method described above be a good way to determine which team was taller (explain why or why not)?
Set up a hypothesis test to validate this claim. Using a significance level of .01 to test this hypothesis, what is your decision rule
Generate a 95% confidence interval for the true mean total cholesterol levels in children.
If 60 percent of those people chewing the gum are successful in stopping smoking, what is the probability that in a group of four smokers using the gum at least one quits smoking?
In the solution to this problem, what is n? p? q? Does it appear that both np and nq are larger than 5? Why is this an important consideration?
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