Mathematics, 05.05.2020 11:50, jasonweber8718
A statistics teacher taught a large introductory statistics class, with 500 students having enrolled over many years. The mean score over all those students on the first midterm was ยต=78 with standard deviation ฯ=10 . One year, the teacher taught a much smaller class of only 25 students. The teacher wanted to know if teaching a smaller class was more effective and students performed better. We can consider the small class as an SRS of the students who took the large class over the years. The average midterm score was xยฏ=83 .The hypothesis should be:
A. H0:ยต=88 vs. Ha:ยต<88 .
B. H0:ยต=78 vs. Ha:ยต=88 .
C. H0:ยต=88 vs. Ha:ยต=78 .
D. H0:ยต=78 vs. Ha:ยต>78 .
Answers: 3
Mathematics, 22.06.2019 03:50, ammarsico19
Suppose medical records indicate that the length of newborn babies (in inches) is normally distributed with a mean of 20 and a standard deviation of 2.6. find the probability that a given infant is between 14.8 and 25.2 inches long.
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Mathematics, 22.06.2019 06:00, jjjjjjgegi3088
If there are 72 students than adults at the dance, how many adults were at the dance?
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