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Mathematics, 20.03.2020 06:05 pandaniezzy
In January 1995, each student in a random sample of 150 physics majors at a large university was asked in how many lab classes he or she was enrolled. The results indicated a mean of 1.74 lab classes and a standard deviation of 1.49. To determine whether the distribution changed over the past 20 years, a similar survey was conducted in January 2015 by selecting a random sample of 150 physics majors. The results indicated a sample mean of 1.87 and a standard deviation of 1.57. Do the data provide evidence that the mean number of lab classes taken by physics majors in January 1995 is different from the mean number of lab classes taken in 2015? Perform an appropriate statistical test using α = 0.10. (10 points)
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