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New car manufacturer claims that miles per gallon for gas consumption is mound shaped and symmetric with a mean of 25.9 mpg with a standard deviation of 9.5 mpg. If 30 cars are tested, what is the probability the average mpg achieved by these 30 cars will be greater than 28?
Answer rounded to the nearest 4 decimal places.
Create network for aerospace launch project below and determine its critical path.
Develop a 90 percent confidence interval for the proportion of applicants that fail the test. (Round your answers to 2 decimal places.)
The mean of a normal probability distribution is 60; the standard deviation is 5.
Compute mean, standard deviation, coefficient of variation and 5 key percentiles for these data.
The estimate of the population proportion is to be within plus or minus .10, with a 99 percent level of confidence. The best estimate of the population proportion is .45. How large a sample is required?
Using standard normal table, show critical value for left-tailed test with α = 0.02.
When a sample mean is greater than the true, population mean, the resulting difference is called:
Suppose that the number of babies born during an hour at a hospital's maternity wing follows a Poisson distribution with a mean of 4 per hour.
Test hypothesis that Site B is more successful in initiating acquaintances than Site A. Use alpha = .05.
The Swansons are planning to fly to Hawaii from Toronto with a stopover in Los Angeles. There are five flights they can take between Toronto and Los Angeles and ten flights between Los Angeles and Hawaii.
Here are fifty observations on the weight of tea bags. Create mean, mode and median.
Give the 90% confidence interval for the mean score in the population of all young women.
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