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A newspaper article about the results of a poll states: "In theory, the results of such a poll, in 99 cases out of 100 should differ by no more than 5 percentage points in either direction from what would have been obtained by interviewing all voters in the United States." Find the sample size suggested by this statement.
Determine the sum of these probabilities , and why is the number less than 1
A Correlation matrix (correlation, coefficients and probability level under the hypothesis rho = 0) for a company's sales force (age, years of service, and current sales) is given below. Comment.
Given the following data on Asian and European Share of U.S. Light Truck Sales(1990-2003): Plot the market-share data. (b) Describe the trend (if any) and discuss possible causes. (c) Fit three trends (linear, exponential, quadratic).
The records show that 8% of the items produced by a machine do not meet the specifications. Use the normal approximation to the binomial distribution to answer the following questions.
To obtain the probability that the mean wage of 75 randomly selected workers will exceed $43,000
A teacher claims that the variance on a calculus test is 68. A sample of 28 students had a standard deviation of 5.8. Test the teacher's claim at the 0.05 level of significance.
The so-called "Gambler's Fallacy" makes the mistake of not recognizing:
Find a 99% confidence interval for the population mean number of weekly miles.
A business researcher uses two-way ANOVA in a report for a client. The researcher does not check the assumptions of using the technique.
It is believed that students who begin studying for final exams a week before the test score differently than students who wait until the night before. Suppose you want to test specifically that students who study earlier have an average score tha..
Select the level of significance, and determine critical, ZCR value.
Compute fraction of the employees cost between $1,500 and $2,000 per year? Evaluate percent that didn't have any dental expense.
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