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1. Suppose you want an 85 percent confidence level. What value would you use to multiply the standard error of the mean?
2. Dr. Patton is a professor of English. Recently he counted the number of misspelled words in a group of student essays. For his class of 40 students, the mean number of misspelled words was 6.05 and the standard deviation 2.44 essay. Construct a 95 percent confidence interval for the mean of misspelled words in the population of student essays.
3.We want to estimate the population mean within 5, with a 99 % level of confidence. The population standard deviation is estimated to be 15. How large a sample is required?
The first unit required 9800 hours to manufacture. The company expects to experience an 82% unit learning curve. Estimate the cost of the 20th unit. (Round intermediate calculations to 4 decimal places)
Acme Taxi has two taxi cabs. The manager tracks the daily revenue for each cab. Over the past 20 days, Cab A has averaged $76.00 per night with a standard deviation equal to $11.00.
What is the probability for the given frequency distribution?
The expected peak expiratory flow rate in adults is 300 with a standard deviation of 50. how many subjects should be enrolled to ensure 80% power to detect a difference of 15 liters per minute with a two-sided test and significance level of 0.05?
According to the Bureau of Economic Analysis, the savings rate of American households, defined as a percentage of the disposable personal income, was 4.20% in 2009.
Compute a 99% confidence interval for the true average number of months taken by bankruptcy petitioners to acquire debts listed on their petitions.
Recognize and describe potential threats (up to 3) to internal validity.
Listed below is the selling price for a share of Coca Cola, at the close of the year. Determine the least squares trend equation.
The random variable x is the number of houses sold by a realtor in a single month at the real-estate office. Its probability distribution is:
A student with a 3.5 to 4 grade point average who took standardized test is randomly selected. Determine the probability that students test score is less than 36.
The correct set of hypotheses to test the effect of the bonus plan, the difference between the t and z distributions
In an article in the Journal of Management Information Systems, Mahmood and Mann investigate how information technology (IT) investment relates to company performance.
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