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A particular database gets hacker attempts at an average rate of 2.6 per month. Assume a Poisson distribution.
1. What is the probability of at least three hacker attempts during a month?
2. What is the probability of a hacker attempt occurring every 15 days or less (assume a 30 day month).
You're designing a survey to assess employee satisfaction. Provide a question that will produce: Develop five demographic questions to measure gender, age, years of experience, level of education, and ethnicity.
The average score of all pro golfers for a particular course has a mean of 70 and a standard deviation of 3.0. Assume 36 golfers played the course today. Find the probability that the average score of the 36 golfers exceeded 71.
Which of the given properties doesn't apply to theoretical normal distribution?
Let X be the number of correct guesses by your friend in the 100 trials and Use the Normal approximation with the continuity correction - Which of the following might be reasonably modeled by the binomial distribution
Misery loves company. It is time for the PE (professional engineer's exam). The results of the national test were normally distributed around the mean score of 70.
Many people attend work and produce little or nothing of value that is why they are terminated.
Your company ships a lot of packages needing quick delivery and short notice. In the past, you have used Speedy Air Delivery Service, but you are beginning to receive complaints from customers who say they are not receiving their packages on time.
At α = .05, is there a difference in variances? Illustrate all steps clearly, including illustration of the decision rule.
For the sample of men, performance on the simulator task declined by an average of 2.9 points with s = 4.1. Is this a statistically significant change? Use a two-tailed test with = .05.
To select a _________ sample, an intact group of subjects that represent the population is selected.
Given a normal distribution of data, we know from the Empirical Rule that in between 2 standard deviations from the mean
Testing for a linear correlation. Construct a scatter plot, find the value of the linear correlation coefficient r, and find the critical values of r from the table below using a=0.05.
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