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For a normal distribution with µ = 200 and σ = 50, find the following values:
a. What is the probability of randomly selecting a score greater than X = 325?
b. What X values form the boundaries for the middle 60% of the distribution? (hint: middle 60% will include 2 cutoff scores with an equal distance to the left and right side of the mean. The distance should mark 30% of area on each side)
Convert heights in inches to centimeters by multiplying inches by 2.54. Find a 95% confidence interval for the mean difference as measured in centimeters.
Is there reason to believe there is a positive linear correlation between the number of t.v. commercials and the sale of this product?
The second person counts the number of shells and records it. Again, each team repeats the experiment five times and computes the mean and the standard deviation.
What could Bristol-Myers have done to improve the validity of the results after it had mailed the 10,000 surveys and received 1983 back?
The admissions office at a Business School for the purposes of making an informed decision whether or not to admit a student wishes to predict a student's performance from their available data.
Explain why you would want to test a sample of batteries rather than the entire population.
In order to test the assumption of a Poisson distribution, a random sample of 150 ten-minute intervals was taken.
a bank manager wishes to see whether there is any preference in the times that customers use the bank. six hours are
In the publication Employment and Earnings, information on the ages of people in the civilian labor force was published. Seventy-five people in the civilian labor force are randomly selected.
Opinions on whether or not the legal drinking age should be lowered to 19 years old, collected from a random sample of parents of high school students in the state. Do a majority of adults in the state support lowering the drinking age to 19?
Suppose at random 41% of school children develop nausea and vomiting following holiday parties and that you conduct a study to examine this phenomenon
For each characteristic, explain whether the random variable is continuous or discrete.- The number of left-handed individuals in a sample of 100 people.
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