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Used Car Ages
One histogram shows the distribution of ages of all 638 used cars for sale in the Ventura County Star Sunday newspaper in 2013.
The other three graphs show distributions of means from random samples taken from the same population of used cars.
One histogram shows means based on samples of 2 cars, another shows means based on samples of 5 cars, and another shows means based on samples of 10 cars.
Each graph based on means was done with many repetitions. Which distribution is which, and why?
List the eight phases of development of a canal system. Discuss the possible costs incurred by the canal owner, the canal users (shippers), and the surrounding community at each phase of developing this engineering system.
Find a 95% confidence interval for the population mean concentration of uric acid in this patient's blood. (Round your answer to two decimal places.)
Suppose you just purchased a digital music player and have put 8 tracks on it. After listening to them you decide that you like 3 of the songs. With the random feature on your player each of the 8 songs is played once in random order. Find the pro..
Suppose that four tickets will be given prizes in a lottery having 30,000 tickets. What is the probability of winning at least one prize if you buy 1,000 tickets?
Is there any evidence to suggest that the variance is different before and after the new meters were installed? Justify your answer.
if the mean age at diagnosis of all people with early onset dementia is 55 years find the probability that a random
Write a 90% confidence interval for the mean daily income this parking garage will generate. Interpret this confidence interval in context.
Confidence intervals are affected by variability. If there is high variability in collected data, this translates into big standard deviation (margin of error) and therefore wider confidence interval. Are wider confidence intervals desirable? Why
What is the probability that the owner would have to fix between 1 and 3 flat tires?
Which observation is the median: 1, 2, or 3?- Move the observations around a bit. How does the median change?- What do you conclude from this exercise?
What is the probability that none of them has lost electricity in his/her household? Assume that their locations are spread out so that loss of electricity is independent among their households.
Identify a research variable within the problem/opportunity that could be measured with some type of data collection.
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