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A sample of 64 statistics students at a small college had a mean mathematics ACT score of 28 with a standard deviation of 4. Estimate the mean mathematics ACT score for all statistics students at this college. Give the 95% confidence interval.
Accidents at a chemical plant occur at a rate of 1.9 per month. Find: The expected number of accidents in a year? The probability of no accidents next month?
He would like to determine whether there are more units produced on the afternoon shift than on the day shift.
If the population standard deviation is σ = 20 is the 6 point effect large enough to be statistically significant? Use the two - tailed test with α = .05
Find the probability that a standard normal random variable will assume a value between: Find a z such that 70% of the area is above that value.
Distinguish the various observational study designs and the randomized controlled trial with regard to validity and feasibility.
Could mud-wrestling be the cause of a rash contracted by University of Washington students in the spring of 1992? Two physicians at the University of Washington health center wondered this when one male and six female students complained of rashes..
Diastolic blood pressure are assumed to follow a normal distribution with a mean of 85 and a standard deviation of 12.
expectation of the statistic that was proposed by Statistician - Based on the information collected in Tasks 1-8, which of the two statistics produces values which tends to be more concentrated about the expectation of the measurement?
Now compute the standard deviation for this distribution.
Explain the difference between the null and alternative hypothesis. Which one can be proven in a statistical sense?
Suppose that nine additional firms will be added to the bankruptcy rolls during the next quarter. How many of those failures are likely to be attribute to fraud?
Explain the importance of random sampling. What problems/limitations could prevent a truly random sampling and how can they be prevented?
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