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A researcher knows the weights of six-year olds are normally distributed with a μ=20.9 kg and a σ=3.2, she suspects that children in poverty-stricken regions are undernourished and therefore underweight. With a sample of n=6 children, the researcher obtains a sample mean of X=18.3 kg. Show values for Z critical and Z calculated. Calculate all values for Z to two decimal places (x.xx)
Using α=.01, use a one-tailed test. State in words what the results are.
Use the expected value approach to decide whether to market the new product. Because of the high dollar values involved, especially the possibility of a $100,000 loss.
ACT scores of high school seniors. The scores of high school seniors on the ACT college entrance examination in 2003 had mean JL = 20.80 and standard deviation (J = 4.80. The distribution of scores is only roughly Normal.
In recent years, the interest rate on home mortgages has declined to less than 6.0 percent. However, according to a study by the Federal Reserve Board
A scatter plot and regression line can be used for all of the following EXCEPT
Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of 0.70 and has failed with a probability of 0.30.
Show your work (either your hand calculations or your statistical program output). You can either scan your work and submit it as a low-resolution graphic, type your answers directly into the document, or cut and paste your work into a Word file.
Results are comparable to what could be expected in human serum. Are true binding percentages for five antibiotics tested all equal? Let α = 0.05.
Now assume that failed items are not replaced during the test. UsingHandbook H--108, determine the plan assuming the time to failure is exponential.
2 to every even-numbered card, with aces being 1s. Determine the frequencies of 0, 1, and 2. Use SPSS to get the value of test statistic and p-value.
What can you conclude regarding the information? Who tends to order the most or least number of condiments?
While dealing with 16 students, suppose that the alternative hypothesis has been one-sided and that it was set as Ha :
How many students should be surveyed to estimate the mean score within 25 points with 90% confidence?
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