louise1443 Posts: 1, Reputation: 1 New Member   #1 May 8, 2012, 09:38 AM

Z testing in maths The management of a company would like to compare the time (in hours per week) that workers in two departments spend on physical exercise. A summary of the available information is given in the table below. Dept I 29(Sample Size) 1.41(Sample Mean) 0.79(Sample Standard Deviation) Dept II 27(Sample Size) 2.00(Sample Mean) 0.64(Sample Standard Deviation) A two-sample z-test is to be used to determine whether there is a difference, at the 5% significance level, between the mean time spent by Departments I and II. Choose the TWO options that give the Magnitude of the test statistic z, to two decimal places, and the conclusion obtained from the test. Options for Question A 0.59 B 0.64 C 1.65 D 2.70 E 3.08 F 3.89 G There seems to be a significant difference, at the 5% significance level, Between the mean times spent by Departments I and II. H There seems to be no significant difference, at the 5% significance Level, between the mean times spent by Departments I and II.

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