Given Samples of 12 randomly selected are
2.4 |
1.6 |
2.1 |
0.4 |
3.2 |
0.8 |
1.1 |
2.4 |
2.9 |
4 |
3.5 |
3.3 |
a) The mean can be calculared as
b) The sample standard deviation calculated as
Hence sample standard deviation as 1.14
c). 95 % confidence interval at 95%
Calculation
= 2.31
t = 1.96
sM = √(1.142/12) = 0.33
μ =
± Z(sM)
μ = 2.31 ± 1.96*0.33
μ = 2.31 ± 0.645
Hence 95% CI is [1.67, 2.96].
Wo e parts (a) The grade point averages (GPA) for 12 randomly selected college students are...
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