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A researcher would like to investigate whether or not college education can affect the IQ of students. She gathers 8 students and has them all take the IQ tests in their first and last years of college to test this hypothesis using an alpha level of .01. Below are the data:
1st year 4th year
110 90
120 98
100 100
90 110
124 100
102 120
110 110
123 120
What is the appropriate test?
State the null hypothesis and the alternative hypothesis:
Find the critical value: +- _____
Calculate the obtained statistic:
Make a decision:
What does your decision mean?
When sampling is for a population proportion from a population with actual proportion p = 0.5, using a sample of size n = 120, what is the standard deviation of our estimator P^?
Determine r.m.s. error for regression prediction of height at 18 from height at 6.
in testing the difference between two population means which of the following assumptions is not true for the
the average of chemical engineers is 39yrs with a standard deviation of 4rs. if an engineer firm employs 24 chemical
Let A be the event that a randomly chosen employee has a college degree and B the event that the chosen employee's income is more than $50,000.
(a) What proportion of US men are between 5 ft 7.0 in and 6 ft 1.0 in tall (67.0 and 73.0 inches, respectively)? (b) If a man is at the 14th percentile in height, how tall is he?
Download the data on the cumulative number of AIDS cases reported in the United States and its age-range breakdown. Draw a pie chart of the data.
Abnormalities. In the 1980s it was generally believed that congenital abnormalities affected about 5% of the nation's children.
In a single-blind study (patients are blind), she finds that the group taking the new medication had reduced anxiety while the placebo group did not. Explain how the experimenter effect may have played a role in the results.
Online polls In June 2008, Parade magazine posed the following question: "Should drivers be banned from using all cell phones?"
the american lighting company developed a new light bulb that it believes will last at least 700 hours on average. a
How many chicken sandwiches must the restaurant stock to be 99% sure of not running out on a given day?
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