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These options are to be interpreted as follows:
1. Z-INT: 1 μ.: Single sample confidence interval for the population mean, μ,
with known population variance, or for large samples with unknown
population variance.
2. Z-INT: μ1−μ2.: Confidence interval for the difference of the population
means, μ
1
- μ
2
, with either known population variances, or for large
samples with unknown population variances.
3. Z-INT: 1 p.: Single sample confidence interval for the proportion, p, for
large samples with unknown population variance.
4. Z-INT: p1− p2.: Confidence interval for the difference of two proportions,
p
1
-p
2
, for large samples with unknown population variances.
5. T-INT: 1 μ.: Single sample confidence interval for the population mean, μ,
for small samples with unknown population variance.
6. T-INT: μ1−μ2.: Confidence interval for the difference of the population
means, μ
1
- μ
2
, for small samples with unknown population variances.
Example 1
– Determine the centered confidence interval for the mean of a
population if a sample of 60 elements indicate that the mean value of the
sample is ⎯x = 23.3, and its standard deviation is s = 5.2. Use α = 0.05. The
confidence level is C = 1-α = 0.95.
Select case 1 from the menu shown above by pressing @@@OK@@@. Enter the values
required in the input form as shown: