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Find the 98% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.) Sample Number Mean Std. Dev. 1 16 35 28 2 22 25 35
a sample of 77 individuals working at a particular construction site office was selected at random. the noise level dba
She asked her assistant for a 95% confidence interval, approximately how large a sample did her assistant use to determine the interval estimate?
Suppose also that we can buy a bond at time 0 for $.90 that will be worth $1 at time 1. What should the price of this option be? Does the assumption of no arbitrage answer this question?
Describes the selected research issue, problem, or opportunity.
You want to know how the commuting time of your employees compare to Departments competing for the same staff, so you get some survey data on average commuting times for36 randomly selected people in your line of business.
questionthis assignment has 4 parts.nbsp save part one as hw5version2.xls then save parts 2 to 4 in a different file
A company is interested in estimating the 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.
More than 1 million skin cancers are expected to be di- agnosed in the U.S. this year-almost half of all cancers diagnosed. The prevalence of skin cancer is attribut- able in part to a history of unprotected or under-pro- tected sun exposure. Sunscre..
Assume that the readings on the thermometers are normally distributed with a mean of 0 degrees and a standard deviation of 1 degrees C.
The lower limit for a 95% confidence interval for the population proportion if a sample of size 200 had a 40 success is.
Can you think of an example where regression analysis can be used? How is regression analysis being used in a retail environment, or how should it be used?
determine the standard deviation if the mean is 1.5 and the coefficient of variation is 2.5. enter your answer to 4
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