AP Statistics 2017

If the true mean is really 38, we are almost certain to reject the false null hypothesis. For a given ...

Since we do not know σ, however, a t interval is more appropriate. The TI-83/84 calculator returns a t ...

(a) It is an observational study because the researchers are simply observing the results between t ...

CHAPTER 11 Confidence Intervals and Introduction to Inference A recent poll estimated that about 18% ...

(E) Why is t used instead of z as the critical value in a confidence interval for a mean? (A) Beca ...

CHAPTER 12 Inference for Means and Proportions IN THIS CHAPTER Summary: In the last chapter, we concentrated ...

Significance Testing Before we actually work our way through inference for means and proportions, we need ...

III. Do the correct mechanics, including calculating the value of the test statistic and the P -val ...

data could plausibly have come from an approximately normal population. A stemplot, boxplot, dotplot, ...

example: A study was done to determine if 12- to 15-year-old girls who want to be engineers differ in IQ fr ...

want to be engineers differs from the mean IQ of all girls in this age range. Notes on the above solut ...

evidence that the true mean IQ for girls who want to be engineers differs from the mean IQ of all g ...

III . = 1.75, s = 2.49, , df = 8 – 1 = 7. 0.025 < P < 0.05 (from Table A). Using the ...

“software” method is based on the formula given in Chapter 11 . The second way of computing degrees of freedom ...

for a particular population proportion exist and follow a pattern similar to those of the previous two sections ...

detects the cancer at a rate different from the 85% rate claimed by its manufacturer? solution: I . Let ...

(This can also be done using 1-PropZTest in the STAT TESTS menu of the TI-83/84.) IV . The question a ...

are given in the following table. Does this study provide statistical evidence at the α = 0.01 level t ...

IV . Because P < 0.01, we have grounds to reject the null hypothesis. We have strong evidence that ...

For the following data, (a) justify the use of a two-proportion z -test for H 0 : p 1 – p ...