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A company manufacturing bolts has 3 machines . machine A is older and produces 30% of the product.machince A and C produces half of the remaining product of the bolt produced by machine A , 5% or defective .the defect rate of the machine B and C is respectively 3% and 2%. one bolt produced at this factory is randomly choosen and is found to be defective . what is the probability that it was produced by machine B?
The standard deviation of all possible x values is called the?
You have a standard deck of cards and you take out 2 cards at random. Let Y1 represent the number of red Queens in your sample and let Y2 represent the number of spades in your sample.
Suppose that people's heights (in centimeters) are normally distributed, with a mean of 165 and a standard deviation of 6. We find the heights of 40 people.
Sample of size 26 was taken from normal population with standard deviation 1.697. Approximate the probability that standard deviation of sample is greater than 1.23.
Is there a significant difference in mean fetal heart rates by position? Run the test at a 5% level of significance.
This second sample had an average response of 132 with a sample variance of 16. What is the pooled standard deviation for this problem?
A study of 36 members of the Central Park Walkers showed that they could walk at an average rate of 2.6 miles per hour. The sample standard deviation is 0.4. Find the 95% confidence interval for the mean for all walkers.
Suppose there is no cyclical component. Quarterly billing for water usage is shown below describe summer billing for year 5.
A travel agent suggests that since the law of averages makes it highly unlikely to have two plane crashes within a few weeks of each other, flying soon after a crash is the safest time. What do you think?
Consider the following estimated regression equation, based on 10 observations.
Test the claim at alpha-.05 that the average wage has not changed by finding the p-value for the test.
Botanist is testing three plants and finds that prob of plant A being alive in a weak is 0.3 plant B is 0.6 and plant C 0.5 these probability are indipendant of each other. Determine the probability of all plants being alive after a weak.
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