The answer to 1) is 'one'.
Alan
sunny wrote:
>
> I need help with the following hypothesis testing question :
>
> "The data processing department at a large company has installed new LCD
> monitors to replace the colour monitors used previously. The 95 operators
> trained to use the new monitors averaged 7.2 hours before achieving a
> satisfactory level of performance. Their sample variance was 16.2 squared
> hours. Past experience with operators on the old colour monitors showed that
> they averaged 8.1 hours on the machines before their performances were
> satisfactory. At the 0.01 significance level, should the supervisor of the
> department conclude that LCD monitor help the operator to learn?"
>
> Based on the above question, I have the following query:
> 1) whether the above is one population or two population?
> 2) If it is two population - is it independent or related?
> 3) If it is related - do u think the above sample variance given is actually
> the difference in the variance between 95 operators using color monitors and
> LCD monitors?
> 4) If it is independent - do u think the above sample variance provided is
> actually pooled variance?
>
> I will appreciate if anybody out there can help me with the above.
>
> Regards,
> Sunny
> [EMAIL PROTECTED]
>
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--
Alan McLean ([EMAIL PROTECTED])
Department of Econometrics and Business Statistics
Monash University, Caulfield Campus, Melbourne
Tel: +61 03 9903 2102 Fax: +61 03 9903 2007
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