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The greater the sulfur content of coal, the less desirable it is as a heating fuel. Given that the variability among assays for sulfur in coal from a certain mine is s = 6 lb/ton and that they follow a normal distribution, answer the following:
a. Mines that assay 80 lb of sulfur per ton are considered worthless for heating fuel. How likely is it that a mine with mean sulfur content of m = 62 lb/ton will be placed in the worthless category on the basis of one random 1-ton sample?
b. Some cities will not permit the sale of coal within the city limits if its assay for sulfur is as great as 34 lb/ton. How likely is it that coal with m = 40 lb/ton will be allowed to be sold within the city limits on the basis of one random 1-ton sample.
The president of an agency specializing in public opinion surveys claims that approximately 70% of all people to whom the agency sends questionnaires responds by filling out an returning the questionnaire.
A random sample of 20 shipments gives x‾ = 2.6 days and s = 0.4 day. Give a 99% confidence interval for the average transit time.
Many communities worldwide are lamenting the effects of so-called big box retailers (e.g., Wal-Mart) on their local economies, particularly on small.
A card is randomly selected from a standard deck. Find the probability that the card is between four and eight (inclusive) or is a club.
Smoking and pregnancy 2003. The organization Kids Count monitors issues related to children. The table shows a 50-state average of the percent of expectant.
An investment firm with 10,000 clients would like to accurately forecast the average dollar amount their current customer will deposit over the coming year.
a sample has a mean of m25. if one person with a score of x25 is added to the sample what effect will it have on the
A random sample of the lifetime of 49 UltraIllum light bulbs has a mean of 3,960 hours and a standard deviation of 200 hours. Construct a 95% confidence interval estimate of the mean lifetime for all UltraIllum light bulbs.
To what extent do syntax textbooks, which analyze the structure of sentences, illustrate gender bias? A study of this question sampled sentences from 10 texts.7 One part of the study examined the use of the words "girl," "boy," "man," and "woman."..
Determine a setting for the mean number of ounces per bottle of soda that minimizes the expected cost per year of producing soda.
For a population with a mean of 60 and a standard deviation of 24, find the z-score corresponding to each of the following samples. What is Om for each equation?
Can the methods legitimately be used to compute a 95% confidence interval for the proportion of Americans who fit that description? Explain why or why not.
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