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Rudeness and its effect on onlookers. Many believe that an uncivil environment has a negative effect on people. A pair of researchers performed a series of experiments to test whether witnessing rudeness and disrespect affects task performance.
In one study, 34 participants met in small groups and witnessed the group organizer being rude to a "participant" who showed up late for the group meeting.
After the exchange, each participant performed an individual brainstorming task in which he or she was asked to produce as many uses for a brick as possible in 5 minutes. The mean number of uses was 7.88 with a standard deviation of 2.35.
(a) Suppose that prior research has shown that the average number of uses a person can produce in 5 minutes under normal conditions is 10. Given that the researchers hypothesize that witnessing this rudeness will decrease performance, state the appropriate null and alternative hypotheses.
(b) Carry out the significance test using a significance level of 0.05. Give the P-value and state your conclusion.
Find the probability that the injured person is female. P( P( )=? E. Find the probability that the injured person is female and was hurt at work. P( P( )=? F.
They plan to feed some animals new food and others a food that is known to be safe, comparing their health after a period of time. In this experiment, how will you implement principles of control, randomization and replication?
Suppose that distribution of grades has average of 78 with standard deviation of 11. Find the appropriate cutoff points for the grades A and F.
Four graduating seniors, A, B, C, and D, have been scheduled for job interviews at 10 a.m. on Friday, January 13, at Random Sampling, Inc. The person- nel manager has scheduled the four for interview rooms 1, 2, 3, and 4, respectively. Unaware of ..
samples of aircrew on long haul schedules are tested to assess the amount of time they spend in stage iv sleep. it has
The manager wishes to estimate the proportion to within 2% with 90% confidence. What is the minimum required sample size?
a sample of 344 subscribers of time magazine shows the mean time spent using the internet is 14.4 hours per week
(a) Calculate the appropriate standard error required. (b) Calculate the respective z-score you would use to determine the probability that the sample mean grade will be less than 75.
What might lead minority students to take more or fewer high school math courses? Would these same factors influence success in college?
the mean weight of loads of rock is 43.0 tons with a standard deviation of 8.0 tons. if 9 loads are chosen at random
use r to solve this question. scores made on a certain aptitude test by nursing students are approximately normally
A manufacturer of bolts has a quality-control policy that requires it to destroy any bolts that are more than 22 standard deviations from the mean.
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