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Cogito

AP Statistics · Chapter 8 · Lesson 3

Practice Worksheet

Communicating Statistical Conclusions

What the exam actually rewards.

12 problems · about 21 minutes · DAT-3.A

NameDate

Figure — use these to answer the problems

A gap between two bars is data. Turning it into a defensible sentence is the skill this lesson teaches.
Group 132
Group 224
Group 132
Group 224
Figure 1

Warm Up

Straightforward practice. Get the method working first.

5 problems

  1. p-value 0.12 at alpha 0.05. Reject the null? 1 yes, 0 no.

    Answer

  2. Why is "we accept the null" wrong?

    • Failing to find evidence is not evidence that nothing is there.
    • It is only a stylistic preference.

  3. p-value 0.30 at alpha 0.05. Reject the null? 1 yes, 0 no.

    Answer

  4. Does a statistical test ever prove a claim? 1 yes, 0 no.

    Answer

  5. What permits generalising to a population? 1 random sampling, 2 random assignment.

    Answer

Build It Up

The same ideas with more to keep track of.

3 problems

  1. What permits a causal claim? 1 random sampling, 2 random assignment.

    Answer

  2. p-value 0.001 at alpha 0.05. Reject? 1 yes, 0 no.

    Answer

  3. How many parts does a complete conclusion have: link, decision, context?

    Answer

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

4 problems

  1. Which phrases belong in a correct conclusion?

    • There is convincing evidence that
    • We fail to reject the null hypothesis
    • This proves that
    • We accept the null hypothesis
    • Tick every box that applies.

  2. p-value 0.049 at alpha 0.05. Reject? 1 yes, 0 no.

    Answer

  3. The Decision

    p-value 0.02 at alpha 0.05. Reject the null? 1 yes, 0 no.

    Answer

  4. The Wording

    A large p-value. Do you accept the null? 1 yes, 0 no.

    Answer