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You want to know how the commuting time of your employees compare to Departments competing for the same staff, so you get some survey data on average commuting times for36 randomly selected people in your line of business.
You find that the mean commuting time is 75 minutes, with a standard deviation of 45. This will give you a standard error of7.5, because your sample size is 36, the square root of which is 6(calculate it for yourself).
a) Based on this, calculate a 95 percent Confidence Interval for the mean commuting time. (Remember, the C.I. is calculated by adding and subtracting from the observed sample mean the product of the standard error and the appropriate Z value.)
Managers at Beta Technologies, Inc., have collected current annual salary figures and potentially related data for a random sample of 52 of the company's full-time employees.
The population (in millions) and the violent crime rate (per 1000) were recorded for 10 metropolitan areas. The data are shown in the following table.
The data below shows the time to process an inpatient admission, before and after a system usage training session was given. The following hypotheses were formulated for this study.
assume you are a consultant to an hmo that is being evaluated on how well it improves the health status of its enrolled
Farrell Corporation's common stock is $25. The price is expected to increase by $5 over the coming year. The standard deviation of the expected price is $3.
Use the following information from a normal population with mean μ = 52 and variance σ2 = 22.5 to calculate the following questions.
An analysis decides to remove records that have missing values-About how many records would you expect would be removed
What is the 95% confidence interval for the mean number of microwaves sold at retail store in the chain last week?
Construct a probability for the number of students in the sample who watch soap operas.
Using Microsoft Excel, create a correlation analysis of Wal-Mart's annual net income over the past 10 years compared with Sears's annual net income over the past 10 years and interpret the results.
How is the MLE and the Wald statistic distributed? For confidence intervals and hypothesis tests. How is the likelihood ratio statistic distributed?
Of the next 15 people that invest in this project, what is the probability that 5 or less people will result an annual net cash flow of at least $100,000.
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