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An experiment involves selecting a random sample of 256 middle managers at a random for study. One item of interest is their mean income. The sample mean is computed to be 35,420 and the sample standard deviation is 2050. What is the standard error of the mean.
in a test of the effectiveness of garlic lowering cholesterol 49 subjects were treated with garlic in a processed
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).
A random sample of teachers from Georgia and an independent random sample of teachers from Indiana have been asked to report their mean annual income.
A manufacturer of batteries for "kids' toys" wishes to investigate the length of time a battery will last. Tests results on a sample of 10 batteries indicated a sample mean of 5.67 and a sample standard deviation of 0.57.
three shifts run continuously at a local beverage manufacturing plant. each shift is expected to meet production goals
What is the probability of finding a sheet chosen at random which contains 3 or more surface flaws and find the greatest standard deviation,
Determine the covariance matrix for values of this process at time t=1,2,3,4. Determine its inverse(numerically) and write formula for pdf of corresponding random vector.
The grade point average of the students at UTC is 2.80 with a standard deviation of 0.84. The grade point average of students at UTK is 2.4 with a standard deviation of 0.84. Which university shows a more dispersed grade distribution?
A random sample of 100 items is selected from a population of size 350. What is the probability that the sample mean will exceed 200 if the population means is 195 and the population standard deviation equals 20?
One sample has a variance of s2=6 and a second sample has a variance of s2=8. If the two samples are the same size (n1=n2), then what is the pooled variance for the two samples?
How do question content and wording, response strategy, and preliminary analysis planning affect question construction? Provide examples of questions that were positively and negatively influenced by these elements.
Do you reject or fail to reject the null hypothesis? What is the effect size? assuming a=0.05, state your hypothesis for a one tailed test, the critical test statistic, your conclusion?
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