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The average commute time for the employees at a small company is normally distributed with a mean of 28 minutes and a variance of 25 minutes. If one employee is randomly selected, find the decimal probability (four decimal places) that his/her commute takes the following amount of time.
A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster.
There is evidence that the two processes yield different average errors. Assume that the population standard deviations are equal. What is the degrees of freedom?
The manufacturer of a coffee dispensing machine claims the ounces per cup is normally distributed with population mean equal to 8 ounces and standard deviation equal to 0.9 ounces. If 50 cups of coffee were measured, what is the probability that.
Just, a case of food poisoning was traced to a particular restaurant chain. The source was identified and corrective actions were taken to make sure that the food poisoning would not reoccur. In spite of the response from the restaurant chain, man..
Suppose that you are interested in determining the relation between the students average SAT scores [x] and their freshman GPA [y].
Concept of statistical signi cance
Sample of 81 houses was studied and found to have the mean of 1858 KWH. Determine the 95% confidence interval for true mean.
Suppose that 64 smokers were sampled. Assume the sample mean and the sample standard deviation remained the same ($20 and $5, respectively).
List the 15 possible samples (without replacement) of two artists that can be selected from the six. for brevity, use the initial provided.
For a population with a mean of μ = 60 and a standard deviation of σ = 24, find the Z score corresponding to each of the following samples.
Of the households with NOW accounts 79.3% had savings accounts. The probability that a randomly selected household with a savings account has no checking account is?
Analysis of data sets assignment
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