Business Statistics

292 Business Statistics

0.025 0.025

7.59 7.59

18.2 ( , 9) 18.2 ( , 9)

10 10

t t− ≤ ≤

+m

18.2 – 5.42  m  .  .

.  m  .

So, the personnel department is 95% condent that the population mean lies

in between Rs 12,780 and Rs 23,620.

9.6.3 Using Minitab to Construct t Condence Intervals for the Mean

For using Minitab for condence interval construction, click Stat/Basic Statistics/1-Sample t. The 1-

Sample t (Test and Condence Interval) dialog box will appear on the screen (Figure 9.12). Place

Sample size, Mean, and Standard deviation as exhibited in Figure 9.12 and click Options. The 1-Sam-

ple t-Options dialog box will appear