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Do students at various universities differ in how sociable they are? Twenty-five Students were randomly selected from each of three universities in a region and Were asked to report on the amount of time they spent socializing each day with Other students. The result for University X was a mean of 5 hours and an estimated Population variance of 2 hours; for University Y, M=4, S^2=1.5 and for University Z, M=6, S^2 =2.5. What should you conclude? Use the .05 level.
(a) Use the steps of hypothesis testing; (b) figure the effect size for the study; And (c) explain your answers to parts (a) and (b) to someone who has never had A course in statistics.
Two pediatricians want to investigate a new laboratory test that identifies streptococcal infections. Dr. J uses the standard culture test, which has a sensitivity of 90% and a specificity of 96%. Dr. M uses the new test, which is 96% sensitive an..
According to a recent survey of 500 randomly selected residents of Popular City, it was found that 38% are in favor of raising city taxes in order to build a new stadium for the local baseball team. (a) What is the population of interest of the su..
What is the probability of randomly selecting a sample of 30 scores which has a mean attention span equal to or greater than 17 minutes.
The sample mean was $22,098 and the standard deviation was $6050. Is there evidence at the 1% significance level that the cost of attendance has increased?
Would it be reasonable to conclude that the population mean is 63 pounds?
What are the mean value and standard deviation of the number among these 15 that are from the second section? What are the mean value and standard deviation of the number of projects not among these first 15 that are from the second section?
Interpret values of b1, b2, b3 and b4 in this estimated regression equation.
You take a random sample around town and calculate a p-value for your hypothesis test of 0.0913. What is the appropriate conclusion? Conclude at the 5% level of significance.
Below, explicitly state slope of your trend line and describe what value of slope signifies in terms of this context.
Evaluate and discuss the following hypothesis based on what you have learned about hypothesis statements. Should they be written differently, or are the sufficient the way they are stated?
How would you respond if someone told you that the correlation between education level and salary was 1.27?
If they didn't launch new mixing plant another alternate can contribute twenty five million profit for the same period (i.e. estimated 6 years). Draw the complete decision tree and determine whether the product should be launched or not.
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