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This is exactly how my teacher posted the question to me. 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.
Construct a frequency distribution, percentage distribution, and cumulative percentage distribution for average airfares.
What is the equation for this regression model?
The number of hurricanes that are formed during each hurricane season can be modeled using the Poisson probability distribution.
Demonstrates clearly and fully the ability to use Excel to perform the correlation for the data set.
Standard deviation 13. in a random sample of 32 womrn aged 18-24, find the probability that the average systolic blood pressure is between 110 and 120 mm hg.
Compute a 95% confidence interval for the mean using the formula and where is the mean of the ten random numbers.
For each of the following, indicate whether the type of probability involved is an example of a priori probability, empirical probability, or subjective probability.
A box contains 5 red marbles and 10 blue marbles. You can take 3 marbles at random, without replacement. What is the probability of winning this game?
Consider the experiment of rolling a pair of dice. Suppose that we are interested in the sum of the face values showing on the dice.
A statistician wants to estimate the mean weekly family expenditure on clothes. He believes that the standard deviation of the weekly expenditure is $125.
For each of the following problems, assume that the homogeneity of variance assumption has not been met and that you will need to use the adjusted Welch statistic.
Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
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