UNDERSTANDING - 9 - TC_Test Methods and Statistics

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* 1. Enter your first and last name

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* 2. Which of the following statements are correct? select all that apply

Ratio of teats to cows affected indicates how problems are distributed across cows.

The combination of problem and non-problem conditions identify possible causes.

Sample all cows if practical.

A random sample can be used of at least 40 cows or 15% of the heard whichever is larger.

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* 3. Which of the following statements are correct? select all that apply

If one teat on one cow is bad then that is one problem.

The statistics assume independence between observations.

If teat:cow ratio exceeds 2, then the measurements are independent.

Primary concerns on the farm should be identified by discussions with the farm manager and initial inspection of cows.

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* 4. Which of the following statements are correct?

Statistical tables indicate different levels of confidence that a herd has a problem based on the observations of a sample.

If the sample size meets, but does not exceed, the percent criterion for that condition, then a larger sample size is needed in order to rule out a problem.

The criteria for the prevalence of swelling at the teat base which merits further investigation is >30%.

Taking a sample from one pen or one string is good practice.

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* 5. Select all that match the following. Use the ratio of affected teats to affected cows as a guide to identifying whether the problem condition is:

Low correlation between teats within cow: Evenly distributed among cows

Low correlation between teats within cow: If certain cows are more likely affected

High correlation between teats within cow: If certain cows are more likely affected

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* 6. The following are conditions of Short-term responses to machine milking:

Color

Swelling at teat end

Vascular damage

Teat end roughness

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* 7. Which of the following are correct? select all that apply

Use yes/no scores

Sample all cows if practical

Ratio of teats to cows affected indicates how problems are distributed across cows

Combination of problem and non-problem conditions identify possible causes