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Advertising expenses are significant component of the cost of goods sold. Listed below is a frequency distribution showing the advertising expenditures for 60 manufacturing companies located in the Southwest. Estimate the mean and the standard deviation of advertising expense.
Advertising Expenditure($ millions) Number of Companies25 up to 35 535 up to 45 1045 up to 55 2155 up to 65 1665 up to 75 8Total 60
A random sample of 20 patients in a weight loss clinical trial lost an average of 25 pounds over an 8 week period. The sample standard deviation is 10.
A poll reported that 80% of adults were satisfied with the job major airlines were doing. Suppose 12 adults are selected at random and the number who are satisfied are recorded. find the probability that 9 or more are satisfied with the airlines b..
Bbut only 1 percent of those closed will have something stolen. If a garage is robbed, what is the probability the doors were left open?
Explain the logic of the ordinary least Square (OLS) method? How are the least squares formulas for the slope and intercept derived?
Create a research question for which the appropriate test of the statistical hypothesis would require the use of a z-score.
In an article in the Journal of Management Information Systems, Mahmood and Mann investigate how information technology (IT) investment relates to company performance.
From a lot of 10 missiles, 4 are selected at random and fired. If the lot contains 3 defective missiles that will not fire, what is the probability that 3 will fire?
Suppose event A and event B are mutually exclusive with the P(A)=12 and P(B)=1/3.Which of the following statements best describes these two events?
In a study shop, a set of data was collected to determine whether or not the proportion of defectives produced. Determine if the proportion of defectives is the same for all three shifts.
Perform a significance test to see if there is a relation between mortality and duration of employment in the group hired AFTER 1945 and report a p-value.
At a recent meeting of educational researchers comparison were made between the type of college freshmen attend and the numbers who drop out. Use a significance level of .05 and determine if the type of school and the drop out rate are independent.
The population variances are 4.6 and 5.0 respectively. Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades?
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