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In 36 randomly selected seawater samples, the mean sodium chloride concentration was 23 cubic centimeters per cubic meter and the standard deviation was 6.7 cubic centimeters per cubic meter (cc/cm). Construct the 90% and 95% confidence intervals for the population mean.
Find out the probability distribution of blood types by gender in the group of 1000 individuals.The table below gives the distribution of blood types by gender in a group of 1000 individuals.
Which of the following is true about the random variables X, Y, and Z?
Find the power of the test designed to determine if the the new safety equipment is effective when the mean percent reduction is actually 2.3%. Assume that the population standard deviation is 12% and that α is 0.02. What is the power?
An important idea in data interpretation is choosing which graph to use under which circumstances. Describe the benefits of different graphs for different sets of data:
The researchers claimed that of those who completed the program, 85% improved. What possible confounds can you identify in this study?
Discuss the properties of a normal distribution. Why are there infinite possible normal distributions? Why should one assume that sample data represents a population distribution?
An electronic circuit board fails randomly with failure rate of λ=0.00021 /h. When it fails it is replaced by a new board.
Prepare a paper examining a regression analysis on your collected data. Begin by describing the research issue, problem, or opportunity and the accompanying data. Then, perform a regression analysis on your data.
You manufacture and sell an iron rod whose electrical conductivity is supposed to be 10.1. You plan to make 6 measurements of the conductivity of a rod you plan to sell.
Is the z value positive or negative? Explain why it should be positive or negative.
In a marketing study, 100 consumers were asked to select the best digital music player from the iPod, the iRiver, and the Magic Star MP3. To summarize the consumer responses with a frequency table, how many classes would the frequency table have?
Determine the class with the greatest number of data values.
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