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A statistician needs to survey a sample of 50 people that is representative of voters in his community. He prepared a list of phone numbers of 50 randomly selected, expected voters. Next morning, he came to work at 8:00 and began to make calls. By 11:00 a.m., his survey was done. Don't discuss what is not said. Discuss what is wrong with what is said.
For the first five troubles reported on a given day, what is the probability that: Fewer than two troubles will be repaired on the same day?
Translate this into a statistical hypothesis-testing problem and carry out the test. Be sure to give the null and alternative hypotheses, the value of the test statistic, the p-value, and your conclusions.
Your company produces a product in a market that has grown by 10% per year for the past 15 years. According to your estimate, the market is currently at 30% of saturation. Predict sales for the next 20 years.
Computing the Z scores for the given data and evaluate µ and σ for the population.
Categorize the events as dependent or independent. Events A and B where P (A) = 0.7, P (B) = 0.8, and P (A and B) = 0.56.
Play 100 games of scraps and empirically determine an estimate for the probability of winning.
Construct a 95% confidence interval for the population mean, assuming a normal distribution?
Consider a random sample of 200 shafts, and let X denote the number among these that are nonconforming, what is the (approximate) probability that X is: At most 30.
Graph a relative frequency histogram for the 500 measurements summarized in the accompanying relative frequency table.
Mean equal to $175 a month and standard deviation of $35, which of the following would be the highest individual rent that you might expect to find?
Find out the test statistic P-value, and critical value, and state the final conclusion. The mean IQ score of statistic professors is less than 120. Sample data: n = 46. Suppose that = 17, and the significance level is = 0.05.
Assume that the population is 0.55. Compute the standard error of the sample proportion for the following sample sizes:
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