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A certain town has 25,000 families. These families 1.6 cars, on the average; the SD is 0.90. And 10% of them have no cars at all. As part of an opinion survey, a simple random sample of 1,500 families is chosen. What is the chance that between 9% and 11% of the sample families will not own cars?
What is the probability that the first two cards dealt yields "Black Jack"?
A statistical study reported that the drug was effective with the p-value of .042. Is this true? The effective sample may be found about 42 times in 1000 samples.
If probability of drawing a face card is 0.625. Determine the probability of not drawing a face card.
About 72% of dog owners buy holiday presents for their dogs. Suppose n = 4 dog owners are randomly selected. Find the expected number of persons, in the sample, who buy their dog holiday presents.
Assume sps professors have the average life normally distributed of 82 years, with population standard deviation of 5 years. Determine percent of sps professors will not live more than 80 years?
Assume a customer has a two-attribute value function for cars: cost and quality. Cost can range from $5,000 to $10,000 and quality can range from 0 to 10 (a higher score is better).
List all samples of size 2, and compute the mean of each sample. Compute the mean of the distribution of sample means and the population mean. Compare the two values. Compare the dispersion in the population with that of the sample means.
A consumer purchases 12 frozen chickens. What is the probability that the consumer will have more than 6 contaminated chickens.
Using α = 0.05, does this sample provide enough evidence to conclude that the average utility bill in Delaware was lower in the winter of 2011-2012 than it was in the winter of 2010-2011?
What is the probability that a consumer buys a can whose contents are actually less than the stated weight of 16 oz.?
A confidence interval increases in width as:
What are the appropriate H0 and Ha for each of the following research studies? In addition, note whether the hypothesis test is one- or two-tailed.
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