Q.2

Monash University has put in place a four-week course of lunchtime exercise breaks for its staff to see if it can improve its employees' job satisfaction. They randomly selected a group of staff who entered the program. They were surveyed about their feelings at work, once at the start of the program and again after the course. Higher scores indicate higher satisfaction. The job satisfaction index results for this group were presented in the file "Job satisifaction.xlsx", available on the Moodle page/Assessment.

a) Does this design use paired data or independent samples? Explain.

b) Compute a 98% confidence interval for the mean change in job satisfaction. Include all necessary conditions

check and show all your working.

c) Based on this confidence interval, is there sufficient evidence to conclude that the job satisfaction is

improved by this program?

d) Test for the mean improvement in job satisfaction at a significance level of 0.05.

AutoSave OFF A A F Y C ... Job sastisfaction Home Insert Draw Page Layout Formulas Data Review View Tell me Share Comments Calibri (Body) 11 A A D Wrap Text v General Sort & Find & Analyse Paste BIUV MVA Merge & Centre v v % 9 Conditional Format Cell Insert Delete Format Formatting as Table Styles Filter Select Data K4 X V fx G H M N P Q R U V W X AA B Staff 7 10 Before 34 28 29 24 15 20 3 33 31 36 46 32 28 30 43 Sheet1 + 100% Ready Accessibility: Good to go