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A sample of 4 different calculators is randomly selected from a group containing 42 that are defective and 27 that have no defects. what is the probability that all four of the calculators selected are defective?
Over the last year the absentee rate at a large corporation averaged 8.2 days absent with a standard deviation of 6 days. One department with 40 employees had an absentee rate of 12 days per employee.
Suppose the annual return on XYZ stock follows a normal distribution with mean 0.12 and standard deviation 0.30.
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
If the loss of weight of customers at the end of their first month is normally distributed with a mean of 6.7lbs and a standard deviation of 0.81lbs
Test the claim of the brewery about the mean volume equal to 32 oz. at the 0.05 significance level. It's your choice whether to use z or t.
Interpret the three confidence intervals in terms of whether there is a significant difference between the mean of the sample and a hypothesized mean of 150.
If person is selected at random and tested, determine the probability of that person having an IQ score between 85 and 115. Make use of EXCEL to help determine the probability.
In a group of six professors selected at random, what is the expected number of extroverts? What is the standard deviation of the distribution?
The parameter of interest is the mean score in this population. The sample is an SRS of size n = 4 drawn from the population. a) Find the mean of the 10 scores in the population. This is the population mean.
A medical school claims that more than 28% of its students plan to go into general practice. It is found that among a random sample of 130 of the school's students, 32% of them plan to go into general practice. Find the P-value for a test of the s..
To guarantee that cans of soda are properly filled, some cans are sampled and the amounts measured. The overall average for the samples is 12 ounces.
What is the probability of this actually happening?
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