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A researcher wants to create a 99% confidence interval for the population mean. He has a sample of n=120, an x-bar of $340, and a sample standard deviation of $122. What is the margin of error?
Find a dataset: approximately 30-100 scores or observations. Write a null and alternative hypothesis, conduct a statistical significance test (in SPSS or Excel), and tell what decision you'd make about the null hypothesis, and why.
What is the probability that a particular driver had exactly two speeding violations?
Compute the correlation among the variables. Describe perfect correlation also negative correlation. Utilize the following data to answer questions related.
The appropriate use of multiple regression depends on being able to make four basic assumptions about the data being used to develop the regression model:
The company sells Mr. Brophy an insurance policy and he has an accident. What's the probability of Mr. Brophy being a good, medium or poor driver?
Determine a 90% confidence interval on difference in mean number of production units for two shifts. Compute 99% confidence interval for part A.
Out of 1000 randomly selected people at the DMV, about how many would be expected to have to wait i) between 26.4 and 32.8 minutes? ii) longer than 39.2 minutes.
Calculate the average or the median of the average or medians of the samples and compare it with the average of the population.
A researcher wants to know if there is a relationship between a person's highest level of education (IV) and differences in life satisfaction (DV).
Modify above problem (Problem 8th) so that each hardware vendor now demands seventy-five (75) units. Any units available from the vendors that are not shipped cost nothing.)
Given that a particular student tests negative for stress, what is the probability that the test results are correct, and that this student is not overstressed?
How large a sample should be taken if the desired margin of error E is:
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