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Average balance of credit card in Hang Road was $4925 surpassing the $4284 national average by 15%. A national market believes that approximately 25% of all persons between age 23 to 38 in the region who received "Abandon your credit card" emails will actually respond to these emails and switch their credit cards. Previous records show that distribution of people's response to such emails is approximately normal. If 1st wave of such 5000 emails were sent to the target age group in Hang Road region, What is the probability that 1750 or fewer people will respond and switch their credit card?Average balance of credit card in Hang Road was $4925 surpassing the $4284 national average by 15%. A national market believes that approximately 25% of all persons between age 23 to 38 in the region who received "Abandon your credit card" emails will actually respond to these emails and switch their credit cards. Previous records show that distribution of people's response to such emails is approximately normal. If 1st wave of such 5000 emails were sent to the target age group in Hang Road region, What is the probability that 1750 or fewer people will respond and switch their credit card?
Tests of hypothesis for two populations. List one test statistic that could be used for comparing two populations with hypothesis testing. Can you think of an example where this could be used?
The response time for Denver police to respond to emergency calls is 8.4 minutes with a standard deviation 1.7 find the probability that the response time for a call between 5 and 10 minutes.
If a technical breakthrough occurred that raised the profit per unit of X 1 to $3, would this affect the optimal solution?
Suppose that it is important to demonstrate that the wall thickness exceeds 4.0 mm. Test appropriate hypotheses using these data. Draw conclusions at α= 0.05.
The dean of students believes that teh costs are greater this semester. What is the test value for this hypothesis?
Give three logically possible directions of casualty, indicating for each direction whether it is a reasonable explanation for the correlation in light of the variables involved (and why).
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
The average U.S. family includes 3.13 persons. To determine whether families in her city tend to be smaller in size compared to those across the United States, a city council member selects a simple random sample of 25 families.
The modem receiver takes a majority vote of the five received bits to estimate the input signal. Find the probability that the receiver makes the wrong decision.
Assume that each of the following studies cannot be analyzed using a parametric procedure. For each of the following studies (below), indicate the appropriate nonparametric procedure, and explain why you chose it.
Carbon monoxide emissions for a certain kind of cary vary with mean 2.9 gm/mi and standard deviation 0.4 gm/mi. A company has 80 of these cars. Estimate the probability that the mean CO level is between 3.0 and 3.1 gm/mi.
Based on this survey, what conclusions can you reach about the use of the Internet at work.
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