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AP Stats
| Question | Answer |
|---|---|
| Categorical example | Characteristics such as the different coat colors of one hundred cats born. |
| Quantitative example | Numbers such as the number of kittens born in each litter per one hundred cats. |
| Categorical... what type of graph? | Bar graphs (percentages) |
| Quantitative... what type of graph? | Histograms (using numbers) |
| Mean and standard deviation... resistance to outliers? Use for what type of graph? | Nonresistant to outliers, and used for normal distributions/uniform. |
| Median and IQR... resistance to outliers? Use for what type of graph? | Resistant to outliers, and used for skewed graphs. |
| 5 Number summary includes which of the following | Min, Q1, Median, Q3, Max |
| What is IQR? How do you find it? | IQR measures the spread of data. IQR = Q3-Q1 |
| What do you need to make a box-plot? Should it be modified? What does that mean? | A five number summary, it should be modified so that outliers do not skew data. In order to create a modified graph, mark outliers as a star, and then record the new min/max. |
| What is the total area under a density curve? | One |
| The _____ of a density curve is the point that divides the area under the curve in half. | Median |
| The _____ of a density curve is the point where a curve would balance if made of solid material. | Mean |
| If a density curve is skewed to the right, the _____ will be further to the right than the _____. | mean, median |
| x bar vs M | x bar is for sampling, M is for the entire population. |
| S vs o | S is for sampling, o is for the entire population |
| How to find the inflection point on a normal curve.... | Inflection points are one standard deviation of either side of the mean. |
| What are the three percentages found on a normal curve one further standard deviation apart each time? What rule is this called? | 68, 95, 99.7 (1, 2, 3 standard deviations away from the mean) The empirical rule |
| How to find the length of a given percentage on a normal distribution | 2nd vars invnorm(area, mean, standard deviation, tail) |
| How to find the percentage of a given length on a normal distribution | 2nd vars normcdf(lower, upper, mean, standard deviation) |
| Z score formula: | x-mean divided by the standard deviation |
| What formula do you use for the following question: "What percent of humans have a pregnancy that lasts longer than 280 days? | 2nd vars normcdf(280, 1e99, mean, standard deviation) |
| Discrete variable: | countable variables, you will know the maximum number |
| Continuous variable: | unlimited number of variables, where you do not not the min or max. |
| What formula do you use for the following question: "How long would a pregnancy be to be the shortest 25% of pregnancies?" | 2nd vars invnorm(0.25, mean, standard deviation, right) |
| Rules for a stem-plot: | - Must have a key - First digit in the middle/left, second, lesser digit on the other side. |
| Formula to find outliers using IQR: | Q3 + 1.5 (IQR) Q1 - 1.5 (IQR) |
| What does SOCS stand for? What must you remember? | shape, outliers, center, spread. remember to compare instead of the list. Use compare words and "-ly" words. |
| What is a response variable? | |
| What is an explanatory variable? | |
| What does DUFS stand for? | |
| r = ? What numbers must it be between? Does it have units? Is it resistant to outliers? | |
| r² = ? | |
| Does correlation equal causation? | |
| What is extrapolation? | |
| What is interpolation? | |
| What must a residual graph look like to be credible? | |
| What is the LSRL? | |
| Correlation only applies to what type of relationship? | |
| What does the x bar y bar stand for? |
Created by:
Keira22
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