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In a sample of 1000 fourth grade students, the average IQ score was 122. The prevailing view is that IQ is distributed normally with a mean of 100 and a standard deviation of 10.
a) Draw a figure that represents the population according to the standard view.
b) What kind of hypothesis testing procedure would you employ to answer the question, "is my sample likely to have been drawn from the "prevailing" population model?"
c) State the null hypothesis and the alternative hypothesis that are implied by this problem.
d) What is the "standard error of of the mean"? Do you have enough information to calculate it for this problem?
In the Big Ten (the NCAA sports league) a sample showed that only 267 out of 584 freshmen football players graduated within 6 years. (a) At (alpha) a = .05
Determine the probability of a positive economic trend given an increasing employment. Are employment and economic trend independent?
To check this theory, 20 invoices are randomly selected and 5 are found to have errors. What is the probability that of the 20 invoices written, five or more would contain errors if the theory is valid?
A survey of 85 families showed that 36 owned at least one DVD player. Find the 99% confidence interval estimate of the true proportion of families who own at least on DVD player.
Choose a group of 4 adults at random. What is the probability that none of them enjoy drinking beer?
The Globe Fishery packs shrimp that weigh more than 1.91 ounces each in packages marked" large" and shrimp that weigh less than 0.47 ounces each into packages marked "small"; the remainder are packed in "medium" size packages.
Discuss the following questions: Of what use is intervention and prevention for this population? What needs to be done in the American justice system to combat crimes committed by the group you have chosen to study?
A researcher predicts that watching a film on institutionalization will change students' attitudes about chronically mentally ill patients.
question on awards day at the end of the year jasmine has an 85 chance of winning top award in english and a 4 out of 5
I work in Aerospace Engineering. Aerospace components are often subjected to cyclic loads and can fail in "fatigue". The designers design the parts against fatigue failures using the "fatigue life" of the materials, typically obtained by testing the ..
Create a 90% confidence interval for mean score on this placement exam for all students.
1. determine if this is an example of probability or statistics the average cost of groceries has risen by 4.2 in the
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