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Steel rods, manufactured with a nominal diameter of 3 cm, are considered acceptable if the diameter falls within the limits of 2.99 and 3.01 cm. It is observed that about 5% are rejected oversize and 5% are rejected undersize.
Assuming that the diameters are normally distributed, find the standard deviation of the distribution. Compute the proportion of rejects if the permissible limits are changed to 2.985 and 3.015 cm
Compute the expected value for the group b. Compute the standard deviation for the group
iq test scores are normally distributed with a mean of 100 and a standard deviation of 15. an individual?s iq score is
question a survey of the opinions of property owners about a street widening project was taken to determine whether the
scores on a national exam assume a normal distribution with a population mean of 50 and population standard deviation
q1. if we have a sample size of 100 and the estimate of the population proportion is 0.10 the mean of the sampling
To test whether there is significant mean difference between two groups using independent sample t test.
The distribution of test scores in a large statistics class is approximately Normal with mean 75 points and standard deviation 7.5. What is the test scoare of a student who's standardized score is 0.4?
For a portion of the 2004 season, the shooting records of the 29 teams in the NBA showed the probability of scoring two points by making a field goal was .44, and probability of scoring three points by making a three point shot was 0.34. I
Determine probability that number of boats constructed next month will be between 4 and 7 (both inclusive).
The unlikelihood of everyone who plays the lottery choosing a correct 6 would be very large indeed. Is this unethical advertising? Is it misleading? is the lottery in general, unethical? Why or why not?
Test the hypothesis that the median percentage of family income spent for food and groceries is 35 against the alternative that it is less than 35. Use α = 0.05.
What percentage of normal and healthy adults would be considered to have a fever? Does this percentage suggest that a cutoff of 100.6 °F is appropriate?
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