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To prepare a report on the economy, analysts need to estimate the percentage of businesses that plan to hire additional employees in next 60 days.
1. How many randomly selected employees must you contact in order to guarantee with a 92% confidence interval within no more than ± 5%?
2. If analysts believe that at most 20% of the firms are likely to be hiring, how many do they survey in order to guarantee with a 92% confidence interval with a margin of error of 0.05?
Describe the data scales best suited for presentation in a pie chart. How effective are the pie charts that often accompany a newspaper article in explaining the statistics used in the article?
Assume that a random variable, x, is distributed according to a normal distribution with mean 46 and standard deviation 12. (a) What is the standard error of the estimate, x-bar, if a sample of size 25 is taken?
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Customers surveyed used electricity to heat their homes. If the company wishes to be 99% confident to within 3%, how large a sample would be needed?
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Downs and Abwender (2002) found neurological deficits in soccer players who are routinely hit on the head with soccer balls compared to swimmers, who are also athletes but who are not regularly hit in the head. Is this an example of an experimenta..
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Interview about attitudes toward alcohol. You have given every student at the party the same chance to be interviewed: what is the chance? Why is your sample not an SRS?
A box of Light bulbs contains six bulbs, two of the bulbs are defective, calculate the following probabilities. What is the probability of choosing a non-defective bulb and a defective bulb in 2 draws
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