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Suppose the age distribution in Sydney is as follows:
Under 18 22%18 -25 18%26-50 36%51-65 10%over 65 14%Total 100%
A researcher is conducting proportionate stratified random sampling with a sample size of 250. Approximately how many people should be sampled from each stratum?
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
Create a 95 % confidence interval for the true mean. Why might normality be the issue here?
Probability using discrete distribution.The probability distribution for the random variable x follows.
The cost accountant for Blue Pharmaceuticals has informed you that the company's materials quantity variance for the drug Allegro was exactly equal to its materials price variance for the year.
At a state political rally, a spaker announced "we should raise test scores so that the students are above the state median". How would you analyze this statement?
One sample has SS = 48 and a second sample has SS = 32. When both samples have n =5, what is each sample variance and computed pooled variance?
Over the past 30 years in the United States, there has been a strong negative correlation between the number of infant deaths at birth and the number of people over age 65. What lurking variables might be causing the changes in each of the variabl..
What is the probability that 30% or fewer male employees will indicate that they have to pick up the slack for mom's working flextime ?
Determine the least squares equation. According to this information, what are the estimated sales for 2005? Listed below is the net sales in $ million for Home Depot, Inc. and its subsidiaries from 1993 to 2002.
The fixed monthly cost of operating the production facility is $3000. How many units of part # 2206 have to be sold in a month to break-even?
Fitting of simple linear regression equation - Given the student population for a school district over the past few years, find the prediction equation for this data.
Find the probability of failure of system for any 4 hours of operation?
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