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As the site engineer at a large construction site, you have been asked to oversee the concrete production process. You are particularly worried about the slump of the concrete. If the slump is too small, it suggests the concrete is too stiff. If there is too much slump, then the concrete is too watery. The contract specifications state that the slump for the particular concrete used should be 1 inch, with a 90% level of confidence. Therefore, during the concrete production process, you instruct the laboratory technician to take 20 random samples of fresh concrete and measure the slump using the appropriate test equipment. The technician obtained the following test results (in inches):
0.92
1.21
1.03
1.10
1.01
0.99
0.89
0.97
1.05
1.11
0.95
1.00
1.04
0.88
1.02
Would you accept that day's production of concrete at the given level of confidence? Assume that, from past slump test results, the concrete slumps are known to be normally distributed.
from past experience it is known that 90 of one-year old children can distinguish their mothers voice from the voice of
Linear correlation between two variables. Find the critical values of r given the number of pairs of data n and the significance level alpha. n = 11, Alpha = 0.01
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A City Survey states that 70 percent of all business owners favor increasing the parking fees. The city has commissioned a random sample of n = 100 business owners.
IQ scores but have been standardized so that complete sample has mean of M = 10 and standard deviation of s = 2. Compute mean and the standard deviation for the sample of n = 8 females and for sample of n = 8 males.
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The Niko Electronics Company has just manufactured 5000 CDs, and 3% are defective. If 10 of the CDs are selected and tested, what is the probability that the entire batch will be rejected?
could mud-wrestling be the cause of a rash contracted by university of washington students in the spring of 1992? two
a chess tournament has 10 competitors of which 3 are russian 5 are french and 2 are english. if the tournament result
Assume that a simple random sample has been selected from a normally distributed population and test the given claim. Use the p-value method for testing hypotheses.
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