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The time to failure of flourescent lights in a large office building is exponentially distributed with a failure rate of 0.03125 hr. How many spare tubes must the building custodian maintain to have at least a 0.95 probability of replacing all failures on a given day? Assume continous 24-hour use of the lights
in an analysis in investigating the usefulness of pennies the cents portion of 100 randomly selected credit card
carry out the steps in constructing a confidence interval for a population proportion define the parameter check
a two-sample t test is going to be carried out where it is assumed that the population variances are unknown but
Suppose we have a ""black box" which on command can generate the value of a gamma random variable with parameters 1.5 and 1. Explain how we can use this black box to approximate
Select the appropriate word to identify whether the measurement represents a categorical variable or a quantitative variable: The average number of minutes a person watches television each day.
Conduct a one-tailed hypothesis test given the information below. A certain brand of Green Energy light bulbs was advertised as having an average illumination life-span of 2,500 hours. A random sample of 50 bulbs burned out with a mean life-span o..
Thirty homes responded, and the sample mean water use per day was 77 gallons with a standard deviation of 9.0 gallons per day.
the lengths of sardines received by a certain cannery have a mean of 4.54 in and a standard deviation of 0.25 in.what
Use given data to create the unbiased point estimate of 12σ'> 2 of percentage of termites that are minor workers.
Scores on an endurance test for cardiac patients are normally distributed with mean = 182 and standard deviation = 24.
a survey of affluent americans those with incomes of 75000 or more indicated that 56 would rather have more time than
Test hypothesis that two processes have identical fractions nonconforming. Use a = 0.05. Create 90% confidence interval on difference in fraction nonconforming between two processes.
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