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The manager of a large office building needs to buy a large shipment of light bulbs. After reviewing specifications and prices from a number of suppliers, the choice is narrowed to two brands whose specifications with respect to price and quality appear identical. He purchases 40 bulbs of each brand and subjects them to an accelerated life test, recording hours to burnout, as shown in Table 5.16.
(a) The manager intends to buy the bulbs with a longer mean life. Do the data provide sufficient evidence to make a choice?
(b) To save labor expense, the owners have decided that all bulbs will be replaced when 10% have burned out. Is the decision in part (a) still valid? Is an alternate test possibly more useful? (Suggest the test only; do not perform.)
one article describes measurements of ammonium concentrations in mgl at a large number of wells in the state of iowa.
Students (freshmen, sophomores, juniors, and seniors) at a local college who were in the same statistics class were given one of three tests.
The Bee line Café is well known for its popular homemade ice cream, which it makes in a small plant in back of the café. People drive long distance to buy the ice cream.
The psychologist estimates that the standard deviation of reaction times is 15 msec. What size sample should he draw?
you are mindlessly piloting your f-14 tomcat home from a mission cruising along at subsonic speed along a horizontal
Give an example of two random variables Y and Z such that E(Y 2) > E(Y )2 and E(Z2)
In 2007, the IRS audited 1.77% of individual tax returns with income greater than $100,000. What is the probability that two randomly selected returns with income greater than $100,000 will be audited?
When a researcher tests at the ,p=.05,p=.01 or p=.001 levels they can only be used in relationship to evaluate risk to patients in implementing the decisions based on research findings.
Display a histogram of the 50 means of the chosen samples.- Describe the histogram in part (a), including shape, center, and spread.
Compute the z score corresponding to each of the following values of x. Compute the z score corresponding to each of the following values of x
A financial analyst maintains that the risk, measured by the variance, of investing in emerging markets is more than 280(%).
How did the persistence of institutions like the church pervade the lives of ordinary individuals? In what ways was this both a positive and a negative.
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