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Suppose that the distribution of IQ's of North Catalina State University's students can be approximated by a normal model with mean 130 and standard deviation 8 points. Also suppose that the distribution of IQ's of Chapel Mountain University's students can be approximated by a normal model with mean 120 and standard deviation 10 points.
You select a student at random from each school. Determine the probability that the North Catalina State University student's IQ is at least 5 points higher than the Chapel Mountain University student's IQ.
All else being equal, what occurs to your confidence interval when you increase value of alpha?
a particular telephone number is used to receive both voice calls and fax messages. suppose that 25 of the incoming
A hair stylist has been in business one year. Sixty percent of his customers are walk-in business. If he randomly samples eight of the people from last week's.
A sample of 81 observations is selected from a normal population with a standard deviation of 5. The sample mean is 40. Determine the 95% confidence interval for the population mean.
The National Confectioners Association asked 1006 adults the following question: "Do you set aside a personal stash of Halloween candy?
suppose the u.s. president wants an estimate of the proportion of the population who support his current policy toward
A standard deviation of 60 seconds. Find the probability that a randomly selected boy in secondary school can run the mile in less than 322 seconds.
what requirements are necessary for a normal probability distribution to be a standard normal probability
a manufacturer of strapping tape claims that the tape has a mean breaking strength of 500 psi. experience has shown
Choose an American driver at random and let the random variable X be the number of speeding tickets the driver has received in the last two years. The discrete probability distribution of X is shown.
a random sample of medical files is used to estimate the proportion p of all people who have blood type b.a if you have
Download the data on the cumulative number of AIDS cases reported in the United States and its age-range breakdown. Draw a pie chart of the data.
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