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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.
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 10 antennas, find the probability that:
Construct a scatter plot of P-RFM and P-HELM. If drawing the plot by hand, use graph paper to ensure accuracy.
Finding the probability of sample and describe the sampling distribution of the sample means.
Ten members of a fraternity take a statistics course. Here are their scores on the first exam in the course:
What is the 'Equally-likely Outcomes Model of Probability?" What is the formula for this model of probability?
Recent studies have shown that the super-cooling temperature of terrestrial frogs frozen at -6°C has a relative frequency distribution with a mean of - 2°C and a standard deviation of 0.3°C (The first of these studies was reported in Science, May ..
Let's suppose that we have 2 variables year and age.. I use STATA to make them into dummy variables as follows:
The mean area of several thousand apartments in a new development is advertised to be 1250 sq. ft. An engineer measured a random sample of apartments: 1244 1245 1242 1245 1237 1245 1246 1232
Cheating Gas Pumps When testing gas pumps in Michigan for accuracy, fuel-quality enforcement specialists tested pumps and found that 1299 were not accurate (within 3.3 oz when 5 gal is pumped), and 5686 were accurate.
Based on the answers to a through d, decide whether or not to reject the null hypothesis at the given significance level. Explain your conclusion in the context of the problem.
Digital Switches, Inc., produces a product called the C3PO with an advertised 0.5% failure rate. Calculate the range within which the population average failure rate can be found with 95% confidence.
What is the major difference between finding significance and confidence intervals using population samples or using population proportions?
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