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1) Test of two means. You should select a hypothesis you are interested in testing and then use a test of two means to test this hypothesis. For example, you may be interested in testing whether the GPA of females is higher than that of males in that class. One is going to draw the inference by using a random sample with replacement of size 25 from each group. Report the p-value of the test. Perform the test using a significance level a = .05. Use graphical methods to present the two populations of interest.
Data
A technician services machines of companies operating in the Phoenix Area. Depending on the type of malfunction, the service call can take exactly 1,2,3,4 hours. The different types of malfunctions occur at the same frequency.
What if the number of debilitating network viruses detected in a day at the firewalls of an Internet service provider within a certain geographic region is fueling a possible management decision to upgrade the detection system.
What is pooled variance and why is it important? Explain what interval data is and give an example: Write the formula for a problem that has 2 sample populations greater than 30 and the standard deviations are known and equal:
calculate the sample size needed given these factorsanova fixed effects omnibus one-waysmall effect sizealpha .05beta
The following table contains t0 new sub- oups of thickness data. Plot this data on the control charts from (a) based on the new subgroup size. Is the process in statistical control?
A post office has a single line for customers waiting for the next available postal clerk. There are two postal clerks who work at the same rate.
question a volunteer ambulance service handles zero to three service calls on any given day. the probability
Given a sample size of 9,245, a sample mean of 38, a standard deviation of 8.15, and a confidence level of 97%, calculate the lower bound of the confidence interval.
What is the probability that the investment property selected is worth less than $400,000 and what is the probability that the investment property selected is worth between $450,000 and $600,000?
Find out whether quality of items produced appears to be independent of production process used. Compute expected number of defective units produced by Process 1.
Calculate a confidence level at 95% to get an interval estimate for proportion?
the following is a cross-tabulation taken from a subset of the 2010 general social survey. respondents were asked
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