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In 1989 527,000 people worked in the air transportation industry. In 2005?, the number was 477,000.
?(a) Find a linear equation giving the number of employees in the air transportation industry in terms of? x, the number of years since 1989.
?(b) Assuming the equation remains valid in the? future, in what year will there be 440,000 employees of the air transportation? industry?
Two rainstorms occurred in one week in a certain area. The first storm lasted 20 hours, and the second storm lasted 40 hours, for a total 1400 mL of rain.
the mean gross annual income of certified welders are normally distruted with the mean of 20000 and a standard
What values does X take on? For the given values of the random variable X, fill in the corresponding probabilities?
A widget inspector inspects 12 widgets and finds that exactly 3 are defective. Unfortunately, the widgets then get all mixed up and the inspector.
Do 1-sample t-test to see if people in Chicago have travelled to fewer states than people nationwide. Utilize the 10% (.10) level of significance.
Using the 7 steps in significance testing, determine whether there is a statistically significant difference between U.S. Air and the national average such that U.S. Air has longer flight delays. Show all 7 steps.
You have chosen a sample of 25 supermarkets out of the 684 you have responsibility for. These 25 have been inspected, and the number of violations of company.
A Production process is considered in control if no more then 5% of the items produced are defective. Samples of size 120 are used for the inspection process.
What is the smallest sample size needed to estimate the mean amount reimbursed to within 50 cents with 90% confidence, if a preliminary study indicates that the sample standard deviation of all amounts reimbursed is $3.00
The Health Study of Nord-Trøndelag County of Norway surveyed more than 60,000 people in a Norwegian county and reported that "people who have gastrointestinal.
a certain brand of phone is supposed to weight 25 grams. we assume that the phone weight follow a normal distribution
Is this information dealing with two single categorical variables individually, or the relationship between two categorical variables?
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