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1. A researcher examines the records of all registered voters in one city and finds that 43% are registered democrats. Is the evaluated group a population or a sample ?
2. A sample of 120 employees of a company is selected and the average age is found to be 37 years. Is the given value a statistics or a parameter?
3. A researcher examines the records of all registered voters in one city and finds that 43% are registered Democrats. Is the given value a statistics or a parameter?
He is expected to satisfactorily service 10 patients per day at an hourly wage of $8. Which dental hygienist would be the better hire? Why?
Create a histogram showing the distribution of symptom scores in this sample. Is this a skewed distribution? If so, is it skewed to the left or to the right?
question an open label study where participant are aware of the treatment they are taking is conducted to assess the
A random sample of n = 4 scores is obtained from a normal population with = 20 and = 4. What is the probability of obtaining a mean greater than M = 22 for this sample?
The Average GPA is known to be 2.67 with standard deviation = 0.58. What GPA will a student need to have to be admitted to the Tech school?
Supposing that the entire $10,000 can be spent on tires (ignoring other costs), and that the true fraction that will fail is approximately .05, can NHTSA attain its goal while staying within the budget? Describe.
According to the National Football League, the average salary for players for the 2010 season was about $1.9 million while the median salary is around $770,000. Why are both numbers reported? What might the difference between the two statistics me..
Use the normal distribution to approximate the following probability: According to the most recent Davenport student profile, 47% of students have children under 17 living at home with them.
Why should you use ANOVA instead of several t tests to evaluate mean differences when an experiment consists of three or more treatment conditions?
X is a continuous random variable uniformly distributed on [20, 45] that is, the end points c = 20 and d = 45.
Critically discuss how you can apply the concept and method of interval estimation to help you solve some of the problems in a regularly accounting department. Give a few examples.
Is this hardware retailer's sales significantly different from all retailers in the chain at p= .05? Are they significantly different at p= .01? Calculate a .95 confidence interval for the data in problem.
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