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To decrease the amount of time it takes to deliver packages, a delivery company purchased computer software that finds the optimal route for making deliveries based upon the input of the package destinations. In the past the average amount of time it took to complete deliveries was 9.4 hours with a standard deviation of 0.8 hours. Since purchasing the software the average delivery time over twenty delivery days was 8.6 hours. At the 0.05 level of significance, test whether the software package has reduced the average time it takes to complete deliveries.
Why do you think it is significant to describe both the measure of central tendency and the measure of dispersion when talking about a data set?
The manager of a local gymnasium has determined that the length of time patron spend at the gymnasium is normal distributed with mean 80minutes and standard deviation 20 minutes. What is the patrons who spend more than 120 minutes at the gymnasium..
An SRS of 100 of a certain popular model car in 1993 found that 20 had a certain minor defect in the brakes. An SRS of 400 of this model car in 1994 found that 50 had the minor defect in the brakes. Let p1 and p2 be the proportion of all cars of t..
Note down a research that requires a decision making with probabilities.
You're trying to explain null and alternative hypotheses to one of the senior managers at Company W and he's not "getting it" when you use snack food sales.
A contingency table has 5 rows and 4 columns. How many degrees of freedom are there?
Multiple regression and correlation analysis provides a means for examining the relationship between of two (2) or more independent variables and the dependent variable.
At the 5% level of significance, test whether the proportion of internet users paying bills online is now more than 50%.
Given following financing project being considered by venture film, determine critical path probability of completion by 17 weeks.
Explain why the ordinary least squares solution is not unique. What can you say about the residuals of any of the solutions. Using the SVD of X, write a closed form expression for this limiting solution.
State the alternative hypothesis that would be used to determine if Brand A has a higher proportion of defective smoke detectors than Brand B. Calculate the test statistic for determining if a difference exists between the failure rates of the two..
Use relative frequencies to estimate the probability that a seed will germinate, What is your estimate?
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