Mathematics, 28.06.2019 09:10 hahHcjckk
Scores this year for students taking the sat math test for the first time are believed to be normally distributed with mean . for students taking the test for the second time, this year's scores are also believed to be normally distributed, but with a possibly different mean . we wish to estimate the difference − . a random sample of the sat math scores of 100 students who took the test for the first time this year was obtained, and the mean of these 100 scores was ¯1=504.5 while the standard deviation was =100 . a random sample of the sat math scores of 30 students who took the test for the second time this year was also obtained, and the mean of these 30 scores was ¯2=539.1 while the standard deviation was =90 . using the conservative value for the degrees of freedom, a 95% confidence interval for − is: (−4.74,73.94) . (−3.10,72.30) . (1.92,67.28) .
Answers: 3
Mathematics, 21.06.2019 13:20
What is the equation and solution for the sentence? the sum of a number and thirty-one is one hundred thirteen. write the equation as n-31=113 and subtract 31 from both sides. the answer is 82. write the equation as n+31=113 and subtract 31 from both sides. the answer is 82. write the equation as n+31=113 and add 31 to both sides. the answer is 144. write the equation as n-31=113 and add 31 to both sides. the answer is 144.
Answers: 1
Mathematics, 21.06.2019 15:00
The system of equations graphed below has how many solutions? y = 2x + 2
Answers: 1
Mathematics, 21.06.2019 15:40
Marya wants to factor the polynomial 36x^3 -22x^2 - 144x.which term can she add to the polynomial that would not change its grestest common factor? check all that apply
Answers: 3
Mathematics, 21.06.2019 16:30
When only separate discreet points are graphed it is called?
Answers: 3
Scores this year for students taking the sat math test for the first time are believed to be normall...
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