Mathematics, 27.06.2020 23:01, random456
Your professor wants to determine if her students today are performing better in statistics than 10 years ago. End of semester grades from a random sample of students enrolled today and one of students enrolled 10 years ago have been obtained:
Today 10 Years Ago
82 88
σ 2 112.5 54
n 45 36
The test statistic for the difference between the two population means is .
a) –3
b) –1.5
c) –.65
d) –.47
Answers: 1
and 
are bigger than 30, the test statistic for the difference between the two population means is calculated as:
and 
are the means of the samples, 
and 
are the variances of the samples and 
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