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Descriptive Statistics
When summarizing interval-ratio variable data using descriptive statistics, what do we lose in our understanding of a sample if we just report the mean and not any measures of dispersion such as the interquartile range or standard deviation? How might this apply to our understanding of a variable such as crime rates in major cities or incarceration rates for minorities across counties?
1. if a uniform distribution and normal distribution both have the same mean and the same range the normal distribution
Let X be a random variable of the continuous type that has pdf f(x). If m is the unique median of the distribution of X and b is a real constant, show that E(X - bl) = E(X - ml) + 2 [(b - x)f(x) £lx, provided that the expectations exist.
a manufacturer of computer hard drives claims a failure rate of 5 or less during the first three years of operation.
through years of careful observation you have begun to suspect that how vocal cats are is somehow related to the
At.05 level of significance, is there evidence to propose that mean life length of batteries produced by this manufacturer is more than 400 hours?
A cohort study was designed to look at the association of pesticides and the occurrence of childhood leukemia. Children living in rural areas were followed and leukemia rates were compared between those children living in areas with high and low p..
For all 12 people, the time to complete Task 1 (T1) and the time to complete Task 2 (T2) (in minutes) were recorded. After collecting the data, a 95% confidence on the difference (T1 - T2) in average time to complete the tasks was found to be (-2...
production engineers at sinotron believe that a modified layout on its assembly lines might increase average worker
A $40,000 loan at 4% dated June 10 is due to be paid on October 11. Calculate the amount of interest
A standard deviation of 16. What is the probability that the mean glucose levels exceeds 115 in a sample of 12 patients.
there are 10 employees in a particular division of a company. their salaries have a mean of 80000 a median of 60000 and
Significant increase in the mortality of lung cancer in both genders, but no significant effect was observed at lower levels." Is this an observational study or an experiment? Fully explain your reasoning.
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