Table of Contents

## What is the four step process for calculating a confidence interval?

PLAN: Identity the appropriate interence method. Check conclitions. DO: If the conditions are met, perterm calculations. CONCLUDE: interpret your interval in the context of the problem.

### What does 95% confident AP stats mean?

If we took many, many samples and constructed a confidence interval for each sample, we would expect 95% of the intervals to capture the true (parameter in context). In 95% of all possible samples, the interval computed from the sample data will capture the true (parameter in context).

#### What percent of the AP stats test is probability?

Unit 4: Probability, Random Variables, and Probability Distributions (10-20% of exam)

**How wet is the earth AP statistics?**

As you may or may not know about 71% of the Earth’s surface is covered by water.

**Is 90 confidence level acceptable?**

Level of significance is a statistical term for how willing you are to be wrong. With a 95 percent confidence interval, you have a 5 percent chance of being wrong. With a 90 percent confidence interval, you have a 10 percent chance of being wrong.

## What is P hat?

The sample proportion, denoted \n\n(pronounced p-hat), is the proportion of individuals in the sample who have that particular characteristic; in other words, the number of individuals in the sample who have that characteristic of interest divided by the total sample size (n). \

### How many people got a 5 on AP Stats?

AP Score Distributions

Exam | 5 | 4 |
---|---|---|

AP Calculus BC | 38.3% | 16.5% |

AP Computer Science A | 23.9% | 21.9% |

AP Computer Science Principles | 12.4% | 21.7% |

AP Statistics | 16.2% | 19.9% |

#### Why is the 10 percent condition important?

When you make inferences about proportions, the 10% condition is necessary because of the large samples. But for means, the samples are usually smaller, making the condition necessary only if you are sampling from a very small population.

**What are the four 4 steps in solving a problem explain each?**

Polya created his famous four-step process for problem solving, which is used all over to aid people in problem solving:

- Step 1: Understand the problem.
- Step 2: Devise a plan (translate).
- Step 3: Carry out the plan (solve).
- Step 4: Look back (check and interpret).

**What are the 4 main phases of the problem-solving process?**

Using Polya’s four phases of problem solving – UNDERSTAND, PLAN, SOLVE, and REVIEW – students work becomes dynamic, iterative and metacognitive. Students unfamiliar with this process may need guidance to start, work, reflect and connect.

## Is a 10 margin of error acceptable?

If it is an election poll or census, then margin of error would be expected to be very low; but for most social science studies, margin of error of 3-5 %, sometimes even 10% is fine if you want to deduce trends or infer results in an exploratory manner.

### Is 80% confidence level good?

Confidence levels range from 80% to 99%,with the most common confidence level being 95%. Often, the particular choice of confidence level depends on your field of study or the journal your results would appear in….Beta Program.

Confidence Level | z*-value |
---|---|

80% | 1.28 |

90% | 1.645 (by convention) |

95% | 1.96 |

98% | 2.33 |

#### What is the difference between P value and p hat?

P relates specifically to the overall population, and P hat relates specifically to a random sample of the overall population.

**What is p carrot?**

The equation for p-hat is p-hat = X/n. In words: You find p-hat by dividing the number of occurrences of the desired event by the sample size. An example helps clarify this: A poll wishes to determine how any Americans agree with the policies of the current president.