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Variance is used to add standard deviations when comparing two samples or populations.
Variance is simply Std^2.
The formula for obtaining Std is dependent on the type of sample taken\ hypothesis test performed i.e. 2-proportion pop/sample, single proportion, poussin, binomial, etc.
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Is mean used to describe the variance of data?
Yes.
What difference between a favorable variance and an unfavorable variance?
Favourable variance is that variance which is good for business while unfavourable variance is bad for business
What is Disribution used in estimating population variance?
The lognormal distribution, probably.
What SPSS procedures can be used for data screening of categorical variables?
variance
How is variance used to measure risk?
In finance, risk of investments may be measured by calculating the variance and standard deviation of the distribution of returns on those investments. Variance measures how far in either direction the amount of the returns may deviate from the mean.
Variance in the rhythm of your heart?
It is the variance in time between each heartbeat. ECG, and blood pressure tests are often used to measure the variance in the rhythm of the heart.
Why is standard deviation better than variance?
Better for what? Standard deviation is used for some calculatoins, variance for others.
Is mean used to describe the variance of data?
Yes.
What use is variance analysis to businesses?
Variance analysis is something used primarily by small businesses. It is a method used by managers of small businesses to improve the performance of their companies.
What variance is best for measuring operating performance?
Efficiency variance can be a good metric because it measures how efficiently inputs were used to produce output.
Standard costs are used to measure?
price and quantity variance
What difference between a favorable variance and an unfavorable variance?
Favourable variance is that variance which is good for business while unfavourable variance is bad for business
What is the difference between negative price variance and volume variance?
Negative price variance is when the cost is less than budgeted. Volume variance is a variance in the volume produce.
What SPSS procedures can be used for data screening of categorical variables?
variance
What is Disribution used in estimating population variance?
The lognormal distribution, probably.
What are the variances in a 4 variance analysis?
efficiency variance, spending variance, production volume variance, variable and fixed components
It is best to isolate the material quantity variance when the materials are purchased?
false- it is best to isolate them once you know how much of the material has been used. If you don't know how much is used, you can't get a variance to evaluate efficiency of how materials were used.
