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A researcher conducts an independent-mearsures research study and obtains t=2.070 with df=28. a. How many individuals participated in the entire research study? b. Using a two-tailed test with a=.05 is there a significant difference between the two treatment conditions? c. compute r2 to measure the percentage of variance accounded for the by the treatment effect.
Suppose a certain brand of Westinghouse light bulbs has a population life expectancy of 3000 and a population standard deviation equal to 100. (Assume the distribution of the population is normal). What is the probability that a sample of 30 light..
Develop a scatter diagram for the data and write a brief summary.
X is a continuous random variable uniformly distributed on [20, 45] that is, the end points c = 20 and d = 45.
The inside diameter of a randomly selected piston ring is a random variable with mean value 12 cm and standard deviation 0.02 cm.
An accounting firm has recently recruited six graduates: three men and three women. Three of the graduates are to be selected at random to work in the firms suburban office. Construct a probability tree.
The math SAT scores for all women are normally distributed with a mean of 496 and a standard deviation of 105.
What should ING's General Counsel do to minimize ING's expected costs?
Using random numbers of 0.1562, 0.9821, 0.3409, 0.5594, and 0.7758, compute the time required for each of five simulated maintenance checks of the airplaine's landing gear.
The sampling distribution of mean score is approximately Normal. It has mean. What is its standard deviation?
Determine the mean and standard deviation for number of actual voters in groups of 1002.
A firm has tendered for two independent contracts. It estimates that it has probability 0.4 of obtaining contract A, and probability 0.1 of obtaining contract B. Find the probability that the firm:
Explain in your own words how to recognize a situation where you needed to use a two-sample test. Give a unique example of a two sample test for proportion or mean. Make sure to detail why only a two sample test would suffice.
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