Population proportion of all flights
A simple random sample of 28 flights of a large airline showed that 19 were on time. Let P be the population proportion of all flights that are on time for this airline. What is 90% confidence interval for P?
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A recent study was conducted to discover the relationship between the weight of car and miles per gallon (gas mileage.) A linear relationship was investigated with weight of car serving as the response variable. The coefficient of determination (r
In 2013, you borrowed $500 at 18% interest. You repaid the loan with interest in 2014. How much to have available for spending in 2014?
In a current survey, 68% of the community favored building the health center in their neighborhood. If 14 citizens are chosen, determine the probability that exactly nine of them favor the building of the health center.
Fred's sample standard deviation of 10 and George's sample standard deviation of 7. At the 5% level of significance, test if there is any significant difference (either way) between Fred and George. Compute the test statistic accurate to two decim
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Cereals give 500 calories and 40g protein and cost $3; tarts give 600 calories and 20g protein and cost $2. How he/she selects his/her breakfast mix?
Assume we are told the sampling distribution developed from a sample of size 400 has a mean of 56.78 and a standard error of 9.6. If the population is known to be normally distributed, what are the population mean and population standard deviation
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