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Suppose it is known that 45% of the population are Coalition voters, 45% are ALP voters, and 10% vote for Greens. Suppose it is also known that The Australian newspaper is read by 70% of Coalition voters, 35% of ALP voters, and 20% of Greens voters. If a randomly selected person is observed reading The Australian, what is the probability that he or she is a Coalition voter (rounded to 3 decimal places)?
Utilizing a binominal experiment, that is each trail can be reduced to two outcomes, construct a binomial distribution.
Sales are above 671,000 copies, and 10% of the time, sales are above 712,000 copies. Find the mean and the variance of annual sales.
What is the value of sample mean? If the interval represents 90 % confidence interval, what would the 99 % confidence interval be?
The Speedy Oil Change Company advertised a 15-minute wait for an oil change. A sample of 23 oil changes showed a mean time of 16.5 minutes and a standard deviation of 4.3 minutes.
Determine whether descriptive or inferential statistics have been used in the statement below:
Assuming that the dogs did better than what would be expected with random guessing, did they do well enough to be used for actual medical diagnoses? Why or why not?
He estimates that he/she has a 45% chance of success with each customer. What is the probability that he/she will earn his/her bonus today?
Nationwide, GMAT scores in a particular year had an average of 528 with an SD of 112 and the scores roughly followed a normal curve. If a student scored 600 on the exam, approximately what percentage of test-takers scored below this student?
An auto manufacturer advertises that "90% of the cars we've ever made are still on the road." Assuming this is literally true, how can it be explained? What facts/statistics would you need to know to expose this misleading claim?
The average price for a new home in a certain neighborhood is $275,000 with a standard deviation of $20,000. What is the probability that a particular home will cost between $280,000 and $300,000?
A study was conducted to determine whether magnets were effective in treating pain. The valves represent pain measurements.
a) Test whether there is a difference between attitudes in the 2 cities. Use a 95% alpha. b) What does your result say about attitude consistency across cities?
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