AP Statistics Chapters 8 and 9 Vocabulary

To test a claim about a mean, when the population standard deviation is unknown we use:

• z procedures

• Pythagorean Theorem

• t procedures

• np > 10 and n(1-p) > 10

Margin of error equals:

• Critical Value ∗ standard Error

• z*

• 1.96

• Standard Error

What do we call the tendency of a sample statistic to over- or under-estimate the value of a population parameter?

(a)  

• I
• II
• III
• I, II, and III

What does this symbol represent?

• sample mean

• population standard deviation

• population mean

• sample mew

What does this symbol represent?

• mean of the parameter

• mean of a population

• mean of a sample

• mean of a proportion

• The slope decreased and the r² increased.
• The slope increased and the r² decreased.
• The slope decreased but r² remained the same.
• Both slope and r² remained the same.

What's the appropriate interpretation of the slope of the regression line?

• For every additional 0.61 hours of growth, the culture is predicted to weight 1 more gram.

• For every additional hour of growth, the culture is predicted to weigh 0.61 more grams.

• For every additional hour of growth, the logarithm of the culture's weight in grams is predicted to increase by 0.61.

• At the beginning of the experiment, the logarithm of the culture's weight in grams was approximately 0.61 ounces.

• B
• C
• D
• E

• B
• C
• D
• E