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If I have a set of values(direct measurements of dynamic deformations of a road at 100m) between 3 and~1000, how can I calculate the 2 characteristical values wich limits the interval including 85,95% of all possible measurements on this road? Using stdev and t-Student, the lower value results negative if some values are too high(all values & results MUST be positives).
If the aberant values are the problem how to analyse the dataset to check wich values to reject?
Based on this confidence interval, can we be 95% confident that the mean yield using catalyst XA-100 exceeds 750 pounds per hour? Why?
The Appliance Center sells a variety of electronics equipments and home appliances. For last four years the following quarterly sales (in $ millions) were recorded.
Katie is studying aggression among adolescent girls. She believes that there is a relationship between the level of interaction a girl has with her mother and her level of aggression.
Arbitrarily choose someone from sample. Determine the probability that they are Jewish and Democrat?
Construct a 95% confidence interval estimate for the proportion of all workers who did not use the Internet within limits. Explain your findings so that your non-quantitative partner will understand them.
Portfolio B's yearly return is normally distributed with a mean of 0.04 and a standard deviation of 0.06. Based on this information, what is the probability that over the next year, the return on portfolio A is lower than the return on portfolio B?
Pretend that you are a Finance person in a large dynamic company. Your dream is to become CFO someday, so you want to make good financial decisions.
Examine the behaviour of 99% critical values for these degrees of freedom, and comment on the limits in this case.
Discuss the issue of statistical power in non-parametric tests (as compared to their parametric counterparts). Which type tends to be more powerful? Why?
Suppose that a malfunction was reported and it was found to be caused by other human errors. What is the probability that it came from station C?
Determine the minimum sample size he must select if he wants to be 90% confident that the true average time is within 10 minutes of the sample average?
Given that X1 is in the model, does X2 contribute to predicting the dependent variable at the .05 significance level?
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