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Southwest airlines is studing the weight of luggage for each passenger for a arge group of domestic passangers, the mean is 47 pounds with a standard deviation of 10 pounds. for a large group of overseas passengers, the mean is 78 pounds and the standard deviation is 15 pounds. compute the relative dispersion of each group.
Three scholarships are available for students. Their values are: $2,000, $2,400, $3,000. Twelve students have applied and no student may receive more than one scholarship. Assume all twelve students are in needs of the funds, how many different..
For a random sample of 35 items, a known population standard deviation of 23, and a sample mean of 211 estimate the: the population mean with a confidence level of 95%.
Find a 95% confidence interval for the mean price of all summer sleeping bags.
Here are numbers of right identifications by 24 children in Active group: 24 children in Passive group had these counts of correct identifications: Is there good evidence which active learning is superior to passive learning?
At the 10% level of significance, does the following sample evidence indicate that the two population means are equal? Assume the populations are normally distributed.
If statistically significant, do you think the difference is large enough to be important?
A survey was completed to estimate the proportion of residents in support of constructing a new football stadium, at tax payer expense, to accommodate an NFL team in the LA area.
First, write down three social problems (e.g., drug abuse, gang membership, bullying, domestic violence, child abuse, etc) that we might attempt to predict using logistical regression.
Construct a 99% confidence interval estimate for the population mean amount of paint included in a 1-gallon can.
The sample standard deviation was 1.1 years. Using the 0.99 degree of confidence, what is the confidence interval for the population mean?
Assuming this is literally true, how can it be explained? What facts and/or statistics would you need to know to expose this misleading claim?
Assume a population standard deviation of 350 kilowatt hours. Determine the standard error of the mean. With a 0.95 probability, determine the margin of error or standard error.
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