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A population has a standard deviation of 22 units. (Give your answers correct to two decimal places.)
(a) Find the standard error for the mean if n = 14.
(b) Find the standard error for the mean if n = 53.
(c) Find the standard error for the mean if n = 85.
A researcher wishes to test the claim that the average age of lifeguards in Ocean City is greater than 24 years. She selects a sample of 36 guards and finds the mean of the sample to be 24.7 years with a standard deviation of 2 years. Is there evi..
Suppose the time interval between two consecutive defective light bulbs from a production line has a uniform distribution over an interval from 0 to 90 minutes.
Suppose that among all participants, the mean test score is 70.07 and the standard deviation is 10.27. Use z-scores to interpret a raw score of 80. What is the corresponding z-score? How would you interpret this result? Show your work.
That they all had false positive results. Is it unusual to arbitarily choose 3 subjects without replacement and get three results which are all false positive results? Describe.
the national center for education statistics reported that mean number of instructional computers per public school
barbara is a research biologist for green carpet lawns. she is studying the effects of fertilizer type temperature at
A business man arrives on a randomly selected day in December. What is the probability that the temperature will be above?
Locate the results of a recent survey in a newspaper, magazine, or Internet article. Outline the survey data so that your peers can understand the variables and results, and then identify at least one key formula from this Module that you could us..
if a basketball player is a 60 free throw shooter then on average how many free throws will he make in a game with six
find the value of t for the difference between two means based on an assumption of normality and this information about
a negative relationship between an explanatory variable x and a response variable y means that as x increases y
A number x is formed by choosing six digits in order, each being a 9 or a 1 and equally likely. Describe the sample space and count the number of sample points it contains.
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