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Say there is the rare disease whose prevalence in general population is 1 in 1000. On your visit to doctor, suspecting you have disease she performs a test and you test positive for disease. Your disease worry threshold is 50%, that is you only worry if there is at least a 50 or more percent chance that you have the disease. Suppose that test has same specificity = p For what value of p will you start to worry?
Can the formal hypothesis testing approach be used for non parametric tests? How are parametric and nonparametric statistics different?
The publisher of Celebrity Living claims that the mean sales for personality magazines that feature people such as Angelina Jolie or Paris Hilton are 1.5 million copies per week.
Dr. Justin Case wants to explore whether or not students perform better if they cram for a test (massed practice) or if they space their studying over weeks (distributed practice).
Prepare a mixed integer programming model for this problem.
The value of R-square indicates the amounts of variation in the dependent variable that is explained by the independent variable.
A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n= 25 third grade children and each child is given a standardized achievement test at the end of the year.
Take your data and arrange it in the order you collected it. Count the total number of observations you have, and label this number N. Then create another set of data starting from one and increasing by one until you reach N.
Seventy-five percent of households say they woud feel secure if they had $50,000 in savings. You randomly select 8 households and ask them if they would feel secure if they had $50,000 in savings.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Inventory manager for Itex received wheels bearing from Wheel - Rite a small producer of metal parts , Unfortunately , Wheel -rite can only produce 500 wheel bearings from wheel rite each year.
Test the hypothesis. Will you reject or not reject the null hypothesis at α = 0.05
Formulate the hypotheses to test to see if the mean of the population is at least 12 ounces.
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