# AP BIOLOGY

## HEREDITY

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How do you find critical value?
 A where degrees of freedom lines up with significance level B where significance level lines up with chi-square C the difference between total and chi-square D degrees of freedom minus significance level
Explanation:

Detailed explanation-1: -Degree of freedom (df) = the sample size-1. This means that the number of samples you have in your study subtracted by one will equal the degree of freedom. So if you have a sample size of 25, subtract one from this value to get the degree of freedom.

Detailed explanation-2: -Determine the critical value by finding the value of the known distribution of the test statistic such that the probability of making a Type I error-which is denoted (greek letter “alpha") and is called the “significance level of the test”-is small (typically 0.01, 0.05, or 0.10).

Detailed explanation-3: -➢ To determine the critical region for a normal distribution, we use the table for the standard normal distribution. If the level of significance is = 0.10, then for a one tailed test the critical region is below z =-1.28 or above z = 1.28.

Detailed explanation-4: -In hypothesis tests, critical values determine whether the results are statistically significant. For confidence intervals, they help calculate the upper and lower limits. In both cases, critical values account for uncertainty in sample data you’re using to make inferences about a population.

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