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A student team in a business statistics course wanted to determine if there was a difference in average download times for the three different types of computers (Mac, iMac, and Dell) available at the university library. The students randomly selected one computer of each type. The students went to the Microsoft game Web site and clicked on the download link for the NBA game. The time (in seconds) between clicking on the link and the completion of the download was recorded. Using ANOVA, they compared the download times with a resulting p-value of 3.43 E-12. A .01 level of significance was used. State the null and alternate hypotheses, state whether the null hypothesis should be rejected or not rejected and your reason for that conclusion, state the meaning of that conclusion specifically in terms of the problem being studied.
For many years TV executives used the guideline that 30 percent of the audience were watching each of the prime-time networks and 10 percent were watching cable stations on a weekday night.
A random sample of 700 drivers has been taken. What is the probability that between 538 and 546 of the drivers were wearing their seat belts?
let x be binaomial with parameters n 15 and p .2a find the expression for the density for xb find the expression for
a researcher wants to estimate at a 99 confidence level the mean age of all persons who own sports cars. it is known
a random sample of 45 door-to-door encyclopedia salespersons were asked how long on average they were able to talk to
you are visiting las vegas and would like to come home with more money than you arrived with. use your knowledge of
At the 0.01 level of significance, test the claim that the mean is less than 342 km. Should the storage yard be moved? Give your reasons.
Todd is less interested in testing a hypothesis than he is in developing an estimate for what people would be willing to pay. He would like 95% confidence intervals for the average price people would be willing to pay
Calculate the value of the chi-square statistic and test whether all regions are statistically the same at 5% and 1% level tests.
For 1989 and 1990 Dave Johnson had the highest decathlon score in the world. When Johnson reached a speed of 32 ft/sec on the pole vault runway, his height above the ground t seconds after leaving the ground was given by h= -16t^2+32t.
What is the expected number of crimes that will be solved? What is the standard deviation?
Use the central limit theorem to find the probability that the average number of moths in 30 traps is greater than 0.6. Give your answer to four decimal places.
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