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Bus Stats II Exam 1
Concepts
| Question | Answer |
|---|---|
| A concept that is distributed on a normal distribution where the middle is the mean | Distribution of Sample Means |
| A concept in which a percentage is distributed on a normal distribution and n x p is greater than or equal to 5 and n(1-p) is greater than or equal to 5 | Distribution of Sample Proportions |
| Concept in which the mean and median is at 0, its a symmetrical bell curve and the total area is 1 under the curve | Normal Distribution |
| Concept in which 68%, 95% and 99% are used for the standard deviations from the mean | Empirical Rule |
| A concept that can be used to estimate a population parameter by using a sample | Confidence Intervals |
| A concept that is the proportions and means of a population | Estimate Parameters |
| A concept that is added or subtracted to the point estimate to create a confidence interval | Margin of Error |
| A concept that is used for creating a confidence interval for means when the sigma is known | Standard Normal Distribution |
| A concept that is used for creating a confidence interval for means when the sigma is unknown. Created in 1908, by William Gusset at Guinness and is defined by the Degrees of Freedom which increase to approach the standard normal distribution | Student's T Distribution |
| Is it true or false that you can calculate the sample size needed to estimate a margin of error within a certain amount? | True |
| A concept that always has 2 hypotheses (Alt and Null) | Hypothesis Testing |
| A concept that shows a change between values | Alternative Hypothesis |
| A concept that always contains an equal sign | Null Hypothesis |
| A concept in which the hypotheses contain a greater than or less than sign | One-Tailed Test |
| A concept in which the hypotheses contain an equal and not equal sign | Two-Tailed Test |
| The type of hypothesis testing that we use in this class. (Opposite of critical value) | P-Value Approach |
| When using the p-value method, what do we do to the hypothesis when p < a? | Reject the Null Hypothesis |
| If a = 0.05 and p = 0.03, what do we do to the hypothesis? | Reject the Null Hypothesis |
| What test statistic is used when testing for a single mean when sigma is known? | Z-Test |
| What test statistic is used when testing for a single mean when sigma is unknown? | T.DIST.RT |
| What standard deviation us used when testing for a mean when sigma is unknown? | Sample Standard Deviation |
| What test is used for a single proportion? | The Z-Test |
| If a = .05 and p = .215, what do we do to the hypothesis? | Fail to Reject the Null Hypothesis |
Created by:
Erika.Meakins
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