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The Spanish patients, two men and two women, were elderly and very ill. All four had undergone routine dialysis at the Hospital de la Princesa. Soon after, they began sweating and vomiting, some of them in excruciating pain. They died within a few hours of receiving treatment.
Nothing seemed exceptional about the deaths of those old, sick patients on dialysis, even though four deaths had occurred in four days at the same place. Hospital officials notified the manufacturers of the equipment involved, as dictated by protocol. But no one paid the incident much attention - until the following week, when people started dying in Valencia. "
At what point does the possibility that an event is more than coincidence become obvious? How can quantitative analysis assist in this realization?
The standard deviation is estimated to be 0.279. Use the 99% level of confidence.
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:
A random sample is selected from a normal population. The population mean is 60 and the standard deviation is 15. after treatment the sample mean is 65. the sample size is 25.
Use a 95% CI to estimate the difference between the proportions of men and women managers who are married. Interpret the interval and what is the conclusion in terms of the populations from which the samples were drawn.
The populations must all be normally distributed, what is meant by normally distributed?
The distribution of lifetimes for a certain type of light bulb is normally distributed with a mean of 1000 hours and a standard deviation of 100 hours. Find the 33rd percentile of the distribution of lifetimes.
The researchers claimed that of those who completed the program, 85% improved. What possible confounds can you identify in this study?
An experiment consists of flipping the fair coin three times and noting the number of heads and tails. A random variable x is defined to be two times the number of heads plus the number of tails.
Sales of a product are influenced by the salesperson's level of education and gender, as well as consumer income, ethnicity, and wealth.
Identifying H0and Hr in ex 5-12 , examine the given statement , then express the null hypothesis H0 and alternative hypothesis H1 in symbolic form.
Let μ be the mean perceived age estimate for all viewers of the ad, and suppose we consider the industry requirement to be met if μ is at least 25. Set up the null and alternative hypotheses needed to attempt to show that the industry requirement ..
Comparison of paired and unpaired samples test - Identify which of the two tests (Independent samples and Paired samples) test is the preferred test and justify your choice.
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