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Construct a 95% confidence interval for the population mean given the following statistics: sample mean = $40,000, sample standard deviation =$1500 and n= 25. Assume that the population from which the sample is drawn is normally distributed.
The producers of a new toothpaste claim that it prevents more cavities than other brands of toothepaste. A random of 60 people used the new toothpaste for 6 months.
Describe the meaning of alternatives, criteria and states of nature. How are they utilized in decision analysis?
A company is interested in estimating μ, mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
Data collected by a child development scientist produced a 95% confidence interval for the mean age, μ (in weeks) at which babies began to craw as [21.4, 31.6]
Determine percentage of employees has 5 dependents? Of all employees which have at least one dependent, determine percentage has more than one?
The Skateworld Company operates ice rinks in several major cities throughout the United States. During each session of open skating, one customer is selected at random to receive a free pass for a future open skating session.
Is there evidence of a difference in objection to sharing information among the organizational groupings? (use α = 0.05)
Gigi has rolled a natural on four straight tosses of the dice. This excites the gamblers standing around the table.
The consultant is given a sample of 225 batteries to test. A. Calculate the standard error of the mean.
Mutual funds are classified as large-cap funds, medium cap funds, or small-cap funds, depending ont eh capitalizaiton of the companies in the fund.
Change the frequencies to percentages - is there a group more likely to get high salaries.
Testing for Population mean - Based on this sample evidence, is Joan's supervisor correct? Use a = .05.
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