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A recent survey of MBA graduates revealed that their mean salary was $80,000, with a standard deviation of $12,000. If a simple random sample of 75 MBA graduates is to be taken. What is the probability that the sample mean salary will exceed $82,500?
Conduct the appropriate analysis to determine if there was an effect of the music on completing problems. Construct the appropriate graph to show the differences in the scores of the two groups.
For a sample of 11 independent observations from a normal distribution of unknown μ and unknown variance σ 2 , the sample mean is 74.6 and sample variance is 2.2. What is the lower point of the 90% confidence interval for μ?
Historical data suggests a standard deviation in the first sample of 10 and a standard deviation in the second sample of 16. Find a 95% confidence interval for the population difference.
Determine if there is a linear correlation between annual income and the amount of insurance? What is the linear regression line for this data?
A study showed that 60% of The Wall Street Journal subcribers watch CNBC every day. Of these, 70% watch it outside the home. Only 20% of those who don't watch CNBC every day watch it outside the home.
To find out the probability that the age of a randomly selected CEO. The average age of CEOs is 56 years. Suppose the variable is normally distributed.
You're asked to determine whether the workers live in the community. Your personnel department provides the following table:
In an effort to counteract student cheating, the professor of a large class created four versions of a midterm exam, distributing the four versions among the students in the class.
We can think of this as the value of mew that maximizes f(y), the probability that our observed value of y occurs.
Test hypothesis that two processes have identical fractions nonconforming. Use a = 0.05. Create the 90% confidence interval on difference in fraction nonconforming between two processes.
The variance of the return per share is 4 for stock 1 and 100 for stock 2. The covariance of the return between the two stocks is 5 per share. Use the total variance of the investment as investment risk.
Based on the information in (a), find a one-sided lower 90% confidence limit for m. Also, find a one-sided upper 90% confidence limit for m.
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