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Allen is an appliance salesman who works on commission. A random sample of 39 days showed that the sample standard deviation value of sales was s = $215. How many more days should be included in the sample to be 95% sure the population mean μ is within $50 of the sample mean x ?
The management of White companies considering a new method of assembling its golf cart. Compute which assembly time using the new method is faster.
Do the data indicate that the lengths of one supplier's 2x4's are subject to more variability than those of the other supplier? Assume α = 0.05. (HINT: F Test for Differences in Two Variances)
The manufacturer of a coffee dispensing machine claims the ounces per cup is normally distributed with population mean equal to 8 ounces and standard deviation equal to 0.9 ounces. If 50 cups of coffee were measured, what is the possibility that- ..
Test whether the mean rate is less than 6%. Use P-value approach.
The measure of forecast accuracy that is not influenced by the measurement scale of the time series data is:
Construct a probability for the number of students in the sample who watch soap operas.
Two samples of sizes 25 and 35 are independently drawn from two normal populations, where the unknown population variances are assumed to be equal.
The so-called "Gambler's Fallacy" makes the mistake of not recognizing:
What are the probabilities of accepting lots that are 10 percent, 20 percent, and 30 percent defective? Estimate the probability of accepting a lot that is 15 percent defective.
Explain how the Central Limit Theorem can help you convince your boss that while you can't get rid of sampling error the results from your statistical work (that is based on sampling) can still be useful.
A certain brand of automobile tire has a mean span of 3500 miles and a standard deviation of 2000 miles. (assume the life spans of the tires have a bell-shaped distribution)
Using the appropriate statistical procedure on the SPSS, test the between group means for a significant difference.
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