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In 1996, 20% of the students at a major university had an overall grade point average of 3.5 or higher (on a scale of 4.0). In 2000, a random sample of 1100 student records found that 25% had a GPA of 3.5 or higher. Is this evidence of grade inflation?
Adult men have weights that are normally distributed with a mean of 172 lb and a standard deviation of 29 lb. Find the probability that the mean weight of the men in the sample is between 170 and 175 lb.
Locate a 95% confidence interval for the true mean failure time of used colored display panels on the printout.- Give a practical interpretation of the interval, part a.
Assuming that 6 in 10 automobile accidents are due mainly to a speed violation; find the probability that among 8 automobile accidents 6 will be due mainly to a speed violation
in a test of the drug lipitor 16.7 of the subjects treated with 10mg of atorvastatin experienced headaches. assume 60
Which of the following statements is not true of the null hypothesis? A) It is your theory B) It is what you would expect by chance alone C) Assumes things to be equal D) None of the above
Customers arrive into a queue, where they are served, and then depart. We model the time between two successive arrivals by an exponential distribution with an arrival rate l=9.
Assume that you go to the drive through window at Wendy's and place an order. Two friends of yours independently place orders at the drive through window at the same Wendy's.
1) A talk radio station has four telephone lines. If the host is unable to talk (i.e., during a commercial) or is talking to a parson, the other callers arc place on hold. When all lines are in use, others who are trying to call in get a busy sig..
Find the least squares estimates of the intercept and slope. Interpret them.- Use a 95% confidence interval to estimate the slope β1. Interpret the interval in terms of this application.
an industrial relations expert on academic and non-academic staff has been studying the relationship between gender
a manufacturer of computers claims its batteries last an average of 3.5 hours before needing recharging. for a sample
a clinical trial was conducted to test the effectiveness of the drug zipiclone for treating insomnia in older subjects.
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