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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
Explain why the t distribution is used as a part of the confidence interval.
Determine the test value? Use α = 0.05. (Use the variances unequal formula).
Consider the following news headline, "Cigarette Smokers Make Lower College Grades than Nonsmokers" The news article goes on to say that researchers at a university collected information on rate of cigarette smoking (total number of cigarettes sm..
According to a national survey of 1,500 Silverman Sachs customers, 1,050 of them were either satisfied or very satisfied with their financial advisor.
You conduct a hypothesis test and you observe values for the sample mean and sample standard deviation when n = 25 that do not lead to the rejection of H0. You calculate a p-value of 0.0667.
A film alliance used a random sample of 50 U.S. citizens to estimate that the typical American spent 78 hours watching videos and DVDs last year. The standard deviation of this sample was 9 hours.
Medical researchers interested in determining the relative effectiveness of two different drug treatments on people with a chronic mental illness established two independent test groups.
Draw two pie charts, which allow the total yearly exports to be compared. Explain the trend in the export of fish as shown in the two pie charts.
What are some examples of each of the trend types (Secular/Linear)? What external factors might affect each of the different types of trending?
A pinochle deck has 48 cards, two of each of six denominations (9, J, Q, K, 10, A) and the usual four suits. In a hand of 12 cards, what is the probability of getting a "bare" roundhouse, namely a king and queen of each suit and no other kings or ..
When trying to understand the stroke data, what would be the advantage of looking at a histogram instead of this frequency distribution?
A researcher wants to estimate the average time (in minutes) spent in a car daily. This will be done by randomly surveying 300 individuals and calculating the sample mean.
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