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How does the t distribution compare with normal distribution? How does this difffference affect the size of Confidence Interval constructed using z relative to those constructed using t? Does the sample size make a difference?
q1. which of the following is a property of the linear correlation coefficient r?if all values of either the x or y
A drug company is considering marketing a new local anesthetic. The effective time of the anesthetic the company is currently producing has a normal distribution with an average of 7.5 minutes and a standard deviation of 1.2 minutes.
Galvanizing lines that are assumed to operate independently. What is the probability that none of the lines experiences a surface finish problem in 40 hours of operation.
Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
fifty percent of the people that get mail-order catalogs order something. find the probability that only four of the 10
The trend line y = 0.70 + 0.005t was calculated from quarterly data for 1999 -2003, where t = 1 for the first quarter of 1999. The seasonal indexes computed from the trend line for the four quarters of the year 2004 were .85, 1.05, 1.15, and .80, ..
einarsen et al. 1998 selected an srs of 935 assistant nurses from a norwegian county with 2700 assistant nurses.a total
In a lengthy manuscript, it is found that only 2/3 of the pages contain no typing errors. Assume that the number of errors per page has a Poisson distribution.
A poll found that 38% of male voters and 46% of female voters support a particular candidate. To test whether this candidate has equal levels of support between male and female voters, the null hypothesis should be
question a study recently reported that the average age of a female shareholder is 44 years. a broker in adelaide wants
An analysis of variances produces SSbetween treatments = 20 with df between treatments = 2, and SS within treatments = 30 with df within treatments = 15. For this analysis, what is the F-ratio?
Nationwide, the average waiting time until electric utility customer service representative answers a call is 300 seconds per call. The Gigantic Kilowatt Energy Company took a sample of 35 calls and found that, on the average
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