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To compare two programs for training industrial workers to perform a skilled job, 20 workers are included in an experiment. Of these, 10 are selected at random and trained by method 1; the remaining 10 are trained by method 2. After completion of training, all the workers are subjected to a time-and-motion test that records the speed of performance of a skilled job. The following time, as measured in minutes, is obtained.
Method 1: 15 20 11 23 16 21 18 16 27 24
Method 2: 23 31 13 19 23 17 28 26 25 28
Test the hypothesis that the mean job time is significantly less after training with method 1 than after training with method 2. Use a signficance level of α = 0.05.
In order to save costs, a firm issued a guideline that fax transmissions of 10 pages ormore should be sent by 2-day mail instead. Exceptions are allowed but they want theaverage to be 10 or below
If the amount of cosmic radiation to which a person is exposed while flying by jet across the US is a random variable having the normal distribution with µ=5.35 mrem, and σ = 0.59 mrem.
suppose the probability is 0.8 that any given person will believe a tale about the transgressions of a famous actress.
Translate the following statements into symbolic form using capital letters to represent affirmative English statements.- Unless we reduce the incidence of child abuse, future crime rates will increase.
an article reported that in a study of a particular wafer inspection process 356 dies were examined by an inspection
A personnel manager for a large corporation feels that there may be a relationship between absenteeism and age and would like to use the age of a worker to develop a model to predict the number of days absent during a calendar year.
The results, in tons of force required for breakage, are as follows: Determine the mean, median, range, and midrange. Calculate the mean absolute deviation (MAD).
If the same hypothesis is tested often enough, it is likely to be rejected at least once, even if it is true. A professor of biology, attempting to demonstrate this fact, ran white mice through a maze to determine if white mice ran the maze faster..
A group of doctors is deciding whether or not to perform an operation. Suppose the null hypothesis, H0, is: the surgical procedure will go well.
If no points are deducted for incorrect answers, what is the probability that the student will score at least 350 points?
What action should plant management take at the 5% level of significance - What is the probability that the null hypothesis would be rejected if the population defective rate is actually 8%?
Problem: 10.5% of the population is 65 or older. Find the probability that the following number of persons selected at random from 25 people are 65 or older.
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