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Over a long period of time in a large multinational corporation, 10% of all sales trainees are rated as outstanding, 75% are rate excellent/good, 10% are rated satisfactory, and 5% are considered unsatisfactory. Find the following probabilities for a sample of n = 10 trainees selected at random: (a) Two or more are rated as outstanding. (b) None of the trainees are rated as unsatisfactory. (c) Two are rated outstanding, six are rated excellent/good, one is rated satisfactory.
What is the probability of selecting a store at random and finding it has both a pharmacy and a floral shop?
Although the phenomnenon is not well understood, it appears that people born during the winter months are slightly more likely to develop schizophrenia than people born at other times.
For each year, create a bar chart and a pie chart.
If incomes for the industry are distributed normally, what is the probability that a randomly selected firm will earn less than Arc?
What is the probability of correctly guess the right code on the first try? What is the probability of not correctly guessing the right code o the first try?
In a recent poll, 126 people were asked if they liked dogs, and 6% said they did. Find the margin of error of this poll, at the 90% confidence level.
A record executive is interested in the popularity of her label's newest band, The Standard Deviations. She asks 10 people how many Standard Deviations songs they know.
If a new graduate is given a bunch of flowers from this outlet, what is the probability that the flowers were purchased by their partner or friend?
Conduct a hypothesis test using H 0 : σ 2 = .009216 to see whether the sample data indicate that the variability in interest rates changed.
In order to determine whether or not a driver's education course improves the scores on a driving exam, a sample of six students were given the exam before and after taking the course. The results are shown below:
Length of smoking time was recorded for each. Mean was =140 hours. Suppose = 8 hours. Determine 95% confidence interval for mean amount of time grocery-store ham is smoked.
Specify the appropriate null and alternative hypotheses if we wish to test the research hypothesis that the mean GHQ score for all employed men exceeds 10.
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