Question

Asked Oct 30, 2019

Part b. Please show TI 84 steps

Step 1

**Confidence interval when population standard deviation is not known:**

The formula of confidence interval for the population mean when population standard deviation is not given is as follows.

Step 2

**Computing the 95% confidence interval for population mean:**

Here, the sample mean (*x-*bar) is 9.

The sample standard deviation (*s*) is 49.

The confidence level is 0.95.

Thus, the level of significance, *α* is 0.05 (= 1 – 0.95).

The degrees of freedom (*n* − 1) is 267 (=268 − 1).

Step 3

*T1-84 procedure to obtain 95% confidence interval:*

- Press the STAT button and highlight TESTS.
- Scroll down to 8: TInterval
- Highlight Stats and hit ENTER
- Choose STATS, Enter values for S as 49, x-bar as 9, n as 268, a...

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