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Exploitron, Inc. conducts a random survey of 700 of their workers and finds that the average employee earns $31,782 per year, with a standard deviation of $622. The Census reports that the average American worker makes $30,059. The CEO of Exploitron claims that his company pays their workers more than average. With a 95% confidence level, do you agree?
The historical reports from two major networks showed that the mean number of commercials aired during prime time was equal for both networks last year.
The owner of Maumee Ford-Mercury wants to study the relationship between the age of a car and its selling price. Listed below is a random sample of 12 used cars sold at the dealership during the last year.
Calculate the p- value and use it to test H0 versus H a at each of a .10, .05, .01, and .001. d How much evidence is there that the mean composite satisfaction rating exceeds 42?
Find a 90% confidence interval for the population mean salaries of such personnel. Round your answer to the nearest dollar and don;t forget to use the $ sign.
Both intervals were calculated from the same sample data. The confidence level for one of these intervals is 90% and for the other is 99%. Which of the intervals has the 90% confidence level, and why?
Make up a scatter diagram with 10 dots for each of the following situations: (a) perfect positive linear correlation, (b) large but not perfect positive linear correlation,
During the 2004 election year, new polling results were reported daily. In an IBD/TIPP poll of 910 adults, 503 respondents reported that they were optimistic about the national outlook, and The President's leadership index jumped 4.7 points to 55...
What is the z-value that was used in the computation. Round your z-value to 2 decimal places and difference in the mean carbohydrate content between the Corn Chip and Potato Chip groups.
Set up the null and alternative hypothesis to test the researcher's prediction.
How can you or your department decide whether or not the variation is important? How could using a mean difference test help?
If 3 different factor levels show a lot of variation between levels this implies:
A jar contains marbles of different colors: 4 white, 6 black, 6 red, and 4 blue. On two random drawings, without replacement, find the probability that the first is black and the second is white.
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