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Feminizing faces study. Research published in Nature (August 27, 1998) revealed that people are more attracted to ‘‘feminized'' faces, regardless of gender. In one experiment, 50 human subjects viewed both a Japanese female and Caucasian male face on a computer. Using special computer graphics, each subject could morph the faces (by making them more feminine or more masculine) until they attained the ‘‘most attractive'' face. The level of feminization y (measured as a percentage) was measured.
(a) For the Japanese female face, y‾ = 10.2% and s = 31.3%. The researchers used this sample information to test the null hypothesis of a mean level of feminization equal to 0%. Verify that the test statistic is equal to 2.3.
(b) Refer to part a. The researchers reported the p-value of the test as p ≈ .02. Verify and interpret this result.
(c) For the Caucasian male face, y‾ = 15.0% and s = 25.1%. The researchers reported the test statistic (for the test of the null hypothesis stated in part a) as 4.23 with an associated p-value of approximately 0. Verify and interpret these results.
How are observations related to the process of forming a hypothesis
bob nale is the owner of nales quick fill. bob would like to estimate the mean number of gallons of gasoline sold to
A particular professor never dismisses class early. Let x denote the amount of time past the hour (minutes) that elapses before the professor dismisses class. Suppose that x has a uniform distribution on the interval from 0 to 10 minutes. The density..
You happen to know that the average GPA for the 5,000 sophomores at USC is 2.8 with a population standard deviation of .25. Amazingly, the GPAs are normally distributed. If you take a randomly chosen sophomore, what is the probability that her gpa..
If the investor chooses the full-service broker, then there is a 0.60 chance that the investment will earn $500, a 0.35 chance that it will earn $200, and a 0.05 chance that it will lose $100. What is the best investment advice in this case?
Calculate the sample proportion of respondents who have a college degree. What is the probability of getting a sample proportion as extreme or more extreme than the one observed in part a if the population has 40% with college degrees?
A nationwide sample of influential Republicans and Democrats was asked as part of a comprehensive survey whether they favored lowering environmental standards so that high-sulfur-coal could be burned in coal fired power plants.
400 customers of the company and finds that 30 of them are actually not happy about the service. Set up the null and alternative hypotheses to test for the company's claim.
a 12-bit ad converter has an input range of plusmn 10 v and is connected to an input amplifier with a programmable gain
Calculate power of test if researcher uses a sample of n = 16 individuals.
Using the Variable view in SPSS list what each of the values of the categories assigned for age represent.
Provide a detailed explanation of what this test measures, and how it is similar to and different from the independent t-test and the chi-square test of independence.
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