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A woman wrote to DearAbby and claimed that she gave birth 308 days after a visit from her husband, who is in the Navy. Lengths of pregnancies have a mean of 268 days and a standard deviation of 15 days. Determine if such a length is considered unusual?
A personnel manager has a computer-generated list of all employees that indicates that 70 percent are full-time employees, 20 percent are part-time employees, and 10 percent are furloughed or laid-off employees.
The following data show the cost of electricity during August 2010 for a random sample of 50 one-bedroom apartments in a large city:
Determine whether the following equations have a solution or not? Apply the discriminant, are the solutions real, repeated real, or complex?
The engineer in a widget factory wants to test out a new form of raw materials. So a batch of widgets are made in the old manner as a control group and then a batch are made with the new materials as a comparison.
Is there evidence the On-the-Move company has less claims? Using the 0.10 level of significance, What is the conclusion?
Create a 99% confidence interval for mean overall duration of symptoms in population of individuals who used zinc lozenges.
Stalnaker technique: what effect does the independent variable have on the dependent variable? type of hypothesis? what is independent variable? dependent variable?
The Restaurants McBurger says that the waiting time for customers is 3 minutes with a standard deviation of population 1 minute. The quality control department found in a sample of 50 clients that the average waiting time was 2.75 minutes.
The number of cases in the data. Repeat until you get an idea how much variation you should expect. But isn"t there a hypothesis test we should apply?
Find the best predicted temperature (in degree F) at a time when a cricket chirps 3000 times in one minute. What is wrong with this predicted value?
Using the .05 significance level, can we conclude that there is a positive association between the two variables?
Use the binomial distribution in the Data Analysis add - in to simulate the distribution of men and women among the next ten arrivals at an emergency room, assuming that, on average, six people out of ten who arrive are men.
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