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Shaver Manufacturing, Inc. offers dental insurance to its employees. A recent study by the human resource director shows the annual cost per employee per year followed the normal probability distribution, with a mean of $1,280 and a standard deviation of $420 per year.
a. What fraction of the employees cost more than $1,500 per year for dental expenses?b. What fraction of the employees cost between $1,500 and $2,000 per year?c. Estimate the percent that did not have any dental expense.d. What was the cost for the 10 percent of employees who incurred the highest dental expense?
Of 144 adults selected randomly from one town, 31 of them smoke. Construct a 99% confidence interval for the percentage of all adults in the town who smoke.
What are some critical decisions involved in selecting an appropriate measurment scale? How might these decisions influence the research design?
Spinning a coin, unlike tossing it, may not give heads and tails equal probabilities. I spun a penny 200 times and got 83 heads. How significant is this evidence against equal probabilities?
Use factoring, the quadratic formula, or identities to solve the following equations:
Susan Williams has been the production manager of Medical Suppliers, Inc., for the past 17 years. Medical Suppliers, Inc., is a producer of bandages and arm slings.
At the .05 level of significance, can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the p-value.
How many Standard Errors is $850 below $900? If we want to test the null hypothesis that the hotline does not reduce costs, what would be the conclusion based on this data?
What is the probability that all three are white? Given that three white chips are selected from II, what is the probability that two white chips were transferred from I?
Your supervisor has asked you to conduct a survey about consumers' buying habits. For this task, you surveyed 100 men and 100 women at a local shopping mall.
What is the distinction between distribution-free methods and nonparametric methods?
A random sample of 80 students is selected for a particular study. What is the probability that the sample proportion (the proportion living in the dormitories) is between 0.30 and 0.50?
Describe meaning of alternatives, criteria and states of nature. Explain how are they utilized in decision analysis?
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