Answer:
The 95% confidence interval for the average number of units that students in their college are enrolled in is :
Confidence Interval ( 11.76, 12.84).
Step-by-step explanation:
The formula for a Confidence Interval is:
C. I = μ ± z × σ/√n
Where
z = z score
μ is the sample mean
σ is the sample standard deviation
n = number of samples
We were given a 95% confidence interval
The z score for a 95% confidence interval = 1.96
μ = 12.3 units
σ = 1.9
n = 47 students
C. I = μ ± z × σ/√n
C.I = 12.3 ± 1.96 × 1.9/√47
C.I = 12.3 ± 0.5432012283
Hence,
Confidence interval = 12.3 ± 0.5432012283
12.3 - 0.5432012283 = 11.756798772 Approximately ≈ 11.76
12.3 + 0.5432012283 = 12.843201228
Approximately ≈ 12.84
Therefore, the 95% confidence interval for the average number of units that students in their college are enrolled in is :
Confidence Interval ( 11.76, 12.84).
