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The manager of a computer software company wishes to study the number of hours senior executives spend at their desktop computers by type of industry. The manager selected a sample of five executives from each of three industries. At the .05 significance level, can she conclude there is a difference in the mean number of hours spent per week by industry?
Banking Retail Insurance12 8 1010 8 810 6 612 8 810 10 10
A "one-shot" device can be used only once; after use, the device (e.g. a nuclear weapon, space shuttle, automobile air bag) either is destroyed or must be rebuilt.
A study conducted at a certain college shows that 53% of the school's graduates find a job in their chosen field within a year of graduation. Find the probability that among 7 randomly selected graduates, at least one finds a job in his or her cho..
What is the probability that the trainee class will consist entirely of men or women? Round your answer to the nearest thousandth.
Her students this semester can be considered a sample from the population of all students she might teach, so she compares their mean score with 72.
An economics professor randomly selected 100 millionaires in the United States. The average age of these millionaires was 54.8 years with a standard deviation of 7.9 years.
Is there evidence that the change was successful in reducing the wait time? (use 0.05 level of significance)
What is the probability of a false negative test (the probability that a person having muscular distrophy tests negative)?
Identify the level of measurement (nominal, ordinal, interval, ratio) for the number of shares held by stockholders.
Identify the sensitivity ranges for the profit of a sausauge biscuit and the amount of saisage available. Explain these sensitivity ranges
Based on the information about typical use, what is the probability that at least 25 of these women become pregnant in the next year? Is the Normal approximation permissible?
The actual weight of soap powder in a box has a normal distribution with a mean of 33 oz. and a standard deviation of 0.8 oz. What proportion of packets are underweight.
The sample information is reported below. At the .10 significance level can we conclude that there is a difference in the amounts quoted?
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