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Question: Suppose that 11 individuals take the GMAT (Graduate Management Admission Test), then take a GMAT preparation course, and then take the GMAT again. Of the 11 individuals in the sample, 9improved their score, 1 individual scored lower, and 1 individual's score was unchanged. Using a significance level of 0.05, can we conclude from this information that the preparation course is successful in improving individuals' performance on the GMAT?
The four characters required for the passcode, the first must be a number,the 2nd and 3rd must be a number. how many different passcodes can you form?
The sample mean talk time was 315 minutes with a standard deviation of 24 minutes. Why can we say that the sampling distribution of x is approximately normal?
Mean output of solar cells of three types are measured six times under random light intensity over a period of 5 minutes, yielding the results shown. Research question: Is the mean solar cell output the same for all cell types?
An average computer mouse inspector can inspect 50 mice per hour. The 48 computer mice inspectors at a particular factory can only insppect 46 mice per hour with a standard deviation of 10.
Calculate the sample statistic and standard error you will use to create the test statistic.
What is the margin of error? What is the 95% confidence interval for the proportion of the population of employees who strongly dislike their current work experience?
A sample of 25 diff. payroll dept found that the employees worked an average of 310.3 days with a std dev. of 23.8 days. what is the 90% confidence interval for the average days worked.
What must be true about the data sets to make the confidence intervals you constructed in parts (a) and (b) valid?
Determine following probabilities where Z follows standard Normal distribution?
Determine the probability of randomly selecting a person graduating with Master's degree who didn't major in Education.
40 were in favor of the Independent candidate, and 140 were undecided. At a 1% level of significance, test to see if the proportion of voters has changed. Calculate the value of the Chi-Square Test Statistic for this problem. What is it?
Create a bell curve chart that shows the number of men needed per day for a 10,000 man hour job. The start date is 1/1/2008 and the end date is 6/1/2008.
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