A random sample of size 15 taken from a normally distributed population revealed a sample mean of 75 and a sample variance of 25 . The upper limit of a 95% confidence interval for the population mean would equal:
1 answer:
Answer:
77.53
Step-by-step explanation:
Sample size (n) = 15
Sample mean (μ) = 75
Sample variance (V) = 25
Sample standard deviation (σ) = 5
For a 95% confidence interval, z-score = 1.960
The upper limit of the confidence interval is defined as:
Therefore, the upper limit of the 95% confidence interval proposed is 77.53.
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E) The width of Sue's interval will be narrower than Javiers
Step-by-step explanation:
In confidence intervals, as sample size increases, the width of the confidence interval decreases.