weirdandnormal1298 weirdandnormal1298

19-12-2022
Mathematics

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the survey of study habits and attitudes(ssha) is a psychological test that measures students' study habits and attitude toward school. scores range from 0 to 200. the mean score for college students is about 115, and the standard deviation is about 30. a teacher suspects that the mean for older students is higher than 115. she gives the ssha to an srs of 25 students who are at least 30 years old. the mean score of the 25 students is 118.6. suppose we know that scores in the population of older students are normally distributed with standard deviation of 30. use signi cance level

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