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1. A recent study of 50 self-service gasoline stations in the Greater Cincinnati' Northern Kentucky metropolitan area revealed that the mean price of unleaded gas was $2.029 per gallon. The sample standard deviation was $0.03 per gallon.
Determine a 99 percent confidence interval for the population mean price.
2. The Badik Construction Company limits its business to constructing decks. The mean time to construct one of their standard decks is 8 hours for a two-person construction crew. The information is based on a sample of 40 decks recently constructed. The standard deviation of the sample was 3 hours.
Determine a 90 percent confidence interval for the population mean.
Describe how to find Confidence interval on the t-table.
At a = 0.05, what is the test value?
What is the probability that only the first child will have cystic fibrosis? What is the probability that they will have 2 normal sons and 1 daughter with cystic fibrosis?
Any value which is based on having measured a sample is called:
Identify the sampling distribution to be used: the standard normal distribution or the Student's t distribution. Find the critical value(s).
Is there enough evidence to support the consumer's conjecture at alpha=.10? 7.2 8.1 7.8 7.4 8.0 8.2 8.1 7.9
Calculate sample proportion and then also calculate a 99% confidence interval for true population proportion, p.
The mean annual salary paid to all employees in a company was EURO 30.000. The mean annual salaries paid to male and female employees of the company were EURO 32.000, and 24.000, respectively. Determine the percentage of males and females employed..
Find the value of the standard normal random variable z, called z 0 such that:
Students in a statistics class at a large state university were given the survey in which one question asked was age (in years); one student was a retired person, and her age was an "outlier".
Suppose that among workers exposed to asbestos in a shipyard in 1980, 33 died over a 10-year period from COPD, whereas only 24 such deaths would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excess..
Probability that the entire batch will be rejected?
The study does provide sufficient evidence to support the claim that less than 75% of college student spend less than $250 per semester on textbooks.
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