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A maintenance engineer has been approached by a supplier who promises less downtime for machines using its new molybdenum-based super lubricant. Of 120 machines maintained with the new lubricant, only 20% were out of service for more than an hour during the month of the test, while 30% of the 100 machines using the previous lubricant were down for more than an hour.
Using the 0.05 level in an appropriate test, evaluate the supplier's contention. Using the appropriate statistical table, what is the approximate p-value for this test?
A federal report find that a lie detector test given to truthful persons have a probability of 0.2 of suggesting that the person is deceptive. What is the probability that at most one is being deceptive
1) A pressure gauge indicates the pressure inside a reaction vessel is 318.2 psig. If the barometric pressure is 754 mm Hg what is the vessel's absolute pressure expressed in kPa.
The following table gives the cumulative frequency distribution of the commuting time (in minutes) from home to work for a sample of 400 persons selected from a city.
Quality Progress, February 2005, reports on improvements in customer satisfaction and loyalty made by Bank of America. A key measure of customer satisfaction is the response (on a scale from 1 to 10) to the question
A manufacturer of bolts has a quality-control policy that requires it to destroy any bolts that are more than 22 standard deviations from the mean.
How large a sample should she check in order to be 93 percent confident that the true proportion is estimated to within 0.014?
Calculate the mean, median, and standard deviation for ounces in the bottles. Construct a 95% Confidence Interval for the ounces in the bottles.
Write the null and alternative hypotheses for testing if participants and non-participants differ in level of problem behavior (Y).
there are 8 cds in a rack 5 are jazz and 3 are classic rock. two cds are selected at random one after the other with
the metal body for a spark plug is made by a combination of cold extrusion and machining. the occurrence of surface
The average buglary rate for a juisdiction has been 311 per year with a standard deviation of 50 what is the probability that next year the number of burglaries will be more than 350.
1.) The following output was generated from conducting a forward multiple regression to identify which IVs (urban, birthrat, lnphone, and lnradio) predict lngdp. The data that were analyzed were from the SPSS country.sav data file.
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