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Assume that the average annual salary for a worker in the United States is $31,000 and that the annual salaries for Americans are normally distributed with a standard deviation equal to $7,500. Find the following:
a) What percentage of Americans earn below $20,000?b) What percentage of Americans earn above $45,000?
Determine regression line for predicting January temperature from latitude.
Use factoring, the quadratic formula, or identities to solve the following equations:
Solve this problem explicitly using all five steps of hypothesis testing, and illustrate your answer with a sketch showing the comparison distribution
A farmer has 40m of fencing with which to enclose a rectangular pen.Given that the pen is x m wide - show that it's area is (20x - x^2)m^2 and deduce that the maximum area that he can enclose (Answer given 100m^2).
Super Cola Bottles soft drinks labeled "net weight 16 ounces." An overall process average of 16.01 ounces has been found by taking several batches of samples, in which each sample contained 5 bottles.
The null hypothesis is to be tested at the 10% level of significance. The critical value from the table is:
The manufacturer then changes a manufacturing process and produces another batch and again measures the MTBF. Did the change to the process improve the MTBF?
Of the adult US population 36% has an allergy. A sample of 1200 randomly selected adults resulted in 33.2% reporting an allergy. Identify the statistic and give its value
That successive pitches are independent of oneanother. Knowing this, the opposing team manager has instructed his hitters to not swing at anything. The better walks on the fourth pitch.
Death would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excessive?
The sample resulted in a mean trading volume of > = 39.48. Assuming a population standard deviation of 15.07, compute the margin of error for a 95% confidence interval for mu.
A statistical study reported that a drug was effective with a p-value of .042. Explain in words what this tells you.
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