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Families of size 4 spent a population mean of $360 on a visit to an amusement park, standard deviation of $50 in October 2000. Operators want to know whether families will spend more in 2001. In an April exit poll, 64 randomly selected families of size 4 were interviewed with the average amount spent by families in the sample was $375. Assuming the standard deviation per family is $50, compute a 95% one sided confidence interval in the mean spending habits of these families. Is this sufficient evidece at 5% level of significance to indicate families will spend more in 2001?
Conduct the hypothesis test formally. If the true population mean of spending habits is $375, what is the power of this test.
Calculate mean and SS for sample of difference scores.
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
Can we conclude that the mean time for a game is less than 3.50 hours? Use the .05 significance level.
Following are the data collected. Should the head of the Bureau be concerned about the time taken at lunch by employees? Why?
In a survey conducted to see how long Americans keep their cars, 2000 automobile owners were asked how long they plan to keep their present cars. The results of the survey follow. Find out the probability distribution associated with these data.
Post-hoc fallacy is that condition where regression shows a high degree of correlation (R square is high), but there is no real cause-effect relationship between the independent and dependent variables.
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed,
During a 52 week period, a company paid overtime wages for 18 weeks and hired temporary help for 9 weeks. During 5 weeks, the company paid overtime and hired temporary help
Telephone calls arrive at a switchboard in a Poisson process at the rate of 2 per minute. A random one-tenth of the calls are long distance.
Determine the probability of receiving at most three calls in a five-minute interval of time. Determine the probability of receiving exactly 10 calls in 15 minutes.
Computing the mean and standard errors of sampling distribution - Using the central limit theorem, find the means and standard errors of sampling distributions
You are considering adding a new food product to your store for resale. Explain how many units of the new product should be purchased for resale.
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