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Problem: Your friend will come to visit you. Suppose that he will come by train with probability 1/6; by ship, car, pr plane with probability 1/6, 1/6, or ½, respectively.
If the probability is ¼ that he will be late by train; 1/3, 1/12 by ship, car, respectively; 0 by plane.
a. Suppose we knew that he was late for the visit. What is the probability that he came by train?
b. Suppose we knew that he was not late for the visit. What is the probability that he came by train?
People with MBAs often get promoted faster than people without the degree. Prepare a 92% confidence interval estimate for the population proportion.
a high school decides to add a new course that prepares randomly selected seniors to take a certain standardized test
If the average tax payer who makes $140,000 per year owes the government $18,200 with a standard deviation of $1500, and the IRS receives a 1040 tax documents from a customer who earned $140,000 that claims he only owes $12,000, should the IRS sus..
the u.s. mint which produced billions of coins each year has a mean defect rate of 5.2 coins per day. let x be the
a scientist attempts to perform a difficult experiment. she is successful in about 80 of her attempts. she attempts the
in 2000 the census bureau reported that the average life expectancy for a person in the u.s.a. had increased to 77
Identify the independent and dependent variables, and Construct a nominal, ordinal, and interval level measure for each independent and dependent variable.
Pilot sample of 30 items indicates a sample standard deviation of 900. Determine the required sample size if the confidence level is 90%.
Would the resulting sets of data represent dependent or independent samples? Why? What could the students change in the project to have it represent the other?
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
Why do we have so many several measures of central tendency? Are all really essential or do they essentially give same information?
3 section of a statistics class containing 28,32 and 35 students averaged 83,80 and 76 respectively on same final exam. what 's the combined population means of all the 3 sections ?
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