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Over many years of administering tests to my statistics students I have found that the overall average of the scores on the first exam that I give each semester is 76.
Well, this semester my class (36 of them -- assume this is a sample) scored an average score of 80 on the exam (standard deviation was 6). At the .05 level of significance, is this class smarter than the classes I usually have?
How large a sample is required to estimate the mean speed with a margin of error equal to 2 miles per hour with 90% confidence?
Penultimate Support Systems makes fairly good speaker and equipment support stands for music groups. The assembly process involves two operations
Many investigaters have studied the relationship between asbestos exposure and death from chronic obstructive pulmonary disease (COPD)
Imagine you are the CEO of a local bank whose credit card holders engage in 1 billion credit card transactions per year; that the likelihood of a fraudulent transaction is 2%
The winning team's score in 13 high school basketball games was recorded. If the sample mean is 54.3 points and the sample standard deviation is 11.0 points, find the 98% confidence interval of the true mean.
Determine the probability of fatal accident over a lifetime? Describe your reasoning carefully. Hint: Suppose independent events. Why might the supposition of independence be violated?
Use value you found in part a to find out degree of confidence for interval 65.65
Women's heights are normally distributed with mean 63.6 and standard deviation of 2.5 in. A social organization for tall people has a requirement that women must be at least 70 in tall.
Give three logically possible directions of casualty, indicating for each direction whether it is a reasonable explanation for the correlation in light of the variables involved (and why).
Suppose it costs $2,500 to buy a defibrillator. Find the expected value of owning a defibrillator if there is a 4% probability that "Silver's Gym" will lose a lawsuit regarding its operation, with each lawsuit resulting in "Silver's Gym" being lia..
Determine Probability values based on discrete distribution.You roll a fair die three times.
Clouds were randomly seeded or not with silver nitrate. Rainfall amounts were recorded from the clouds. The purpose of the experiment was to determine if cloud seeding increases rainfall. The following data is obtained:
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