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A company's headquarters is located in downtown Chicago. The company is interested to know the mean driving time of its employees if they require their employees to start working at 6:00 am. Fifty employees are randomly sampled over four weeks and asked to record their driving time. The mean driving time is 35 minutes with a standard deviation is 10 minutes. What is the 98 percent confidence interval for the population mean?
Using the probability formulas, find the proportion of employees who either have MBAs or are managers.
At 5 % level of significance, does this sample prove violation of the guideline that average patient muts pay no more than $250 out-of-pocket? Is this a close decision?
A record executive is interested in the popularity of her label's newest band, The Standard Deviations. She asks 10 people how many Standard Deviations songs they know.
Develop a seasonally adjusted forecast model for these sandwich sales data. Forecast demand for each season for 2004 using a linear trend line estimate for sales in 2004. Do the data appear to have a seasonal pattern?
Iindicate all samples are approximately Normal with no outliers. Is the ANOVA appropriate?
Predict the final average of a student who made an 83 on the first test. Give the value of r and r squared for this model. Interpret the value of r squared in the context of this problem.
Based on this sample information, create a 90% confidence interval for population mean yearly premium.
The sample size n, the sample means, and the sample standard deviations for the two groups are given
Find the optimal order quantity and what is the optimal total ordering cost per year vs. what is that cost with the current policy?
Recently, students in a marketing research class were interested in the driving behavior of students. Specifically, the marketing students were interested if exceeding the speed limit was related to gender.
For a hypothesis test about a population proportion or mean, if the level of significance is less than the p-value, the null hypothesis is rejected.
The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is
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