Question

Asked Apr 2, 2019

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Step 1

**a. Confidence interval:**

The (1-α) % confidence interval for *β*_{1} is given by:

Step 2

**Computing the 95% confidence interval for β_{1}:**

I have entered the data for treatments number of items, and time in rows 1 to 101 of columns A, and B respectively, with row 1 having the labels (Number of items and time).

The confidence interval is computed by using EXCEL. The software procedure is given below:

- Select
**Data > Data Analysis > Regression> OK**. - Enter
**Input Y Range**as**$B$1:$B$101**and**Input x Range**as**$A$1:$A$21**, tick on**Labels**, tick on**confidence level**and enter**confidence level**as**95%,**enter**output Range**as**$D$1**and click**OK**.

The outputs using EXCEL is as follows:

Step 3

Therefore, the 95% confidence interval for *&beta...*

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