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Your company ships a lot of packages needing quick delivery and short notice. In the past, you have used Speedy Air Delivery Service, but you are beginning to receive complaints from customers who say they are not receiving their packages on time. Speedy advertises that it delivers packages anywhere in the U.S. in an average of two days. To check Speedyâ??s claim, you select a random sample of 25 packages and find that the average delivery time for those 25 packages was 2.3 days.
Do you have sufficient evidence to accuse Speedy of false advertising? Explain why or why not. (For purposes of this discussion, we will assume that it is known that the standard deviation of package deliveries for Speedy is 0.5 days.)
Compute the 95% confidence interval around the mean of each of the three groups and plot the confidence interval in the space provided above.
The records show that 8% of the items produced by a machine do not meet the specifications. Use the normal approximation to the binomial distribution to answer the following questions.
How would I go about finding the probabilities for the following discrete random variables? Among a shipment of 5,000 tires, 1,000 are slightly blemished. If one purchases 10 of these tires, what is the probability that 3 or less (P (x
Determine the mean and standard deviation of the data. What percentage of the data lies within one standard deviation of the mean value?
At the .05 significance level, is there a difference in the mean number of calls per day between the two employees?
How could the Central Limit Theorem apply in making a business decision? Try to provide an example from your current or future career.
A manufacturer of 35-mm cameras knows that a shipment of 30 cameras sent to the large discount store contains 8 defective cameras. The manufacturer also knows that the store will choose two of the cameras at a random, test them, and accept the shi..
Multiple choice question based on multiple regression - The coefficient of determination for this model is
Give an example of two variables that probably have a significant linear correlation coefficient, but one variable does not necessarily cause the other.
By using 0.05 level of significance, is there any evidence of difference in mean life of bulbs produced by two kinds of machines?Calculate p-value and interpret its meaning.
A polling company obtains an alphabetical list of names of voters in a precinct. They select every 20th person from the list until a sample of 100 is obtained.
A library checks out an average of 250 books per day, with a standard deviation of 75 books. If a sample of 36 days of operation is selected and the sample mean is computed,
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