Term
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Definition
| A single value estimate for a population parameter. The most unbiased point estimate of the population mean is the sample mean. |
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Term
| T-Distribution Properties |
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Definition
| 1) The t-distribution is bell-shaped and symmetric about the mean. 2) It is a family of curves, each determined by the 'degrees of freedom (which for a t-distribution is equal to n-1). 3) The total area under the t-curve is 1 or 100%. 4) The mean, median, & mode are equal to 0. 5) As the degrees of freedom increase, the t-distribution approaches the normal distribution. |
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Term
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Definition
| The number of free choices left after a sample statistic is calculated. |
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Term
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Definition
| A process that uses sample statistics to test a claim about the value of a population parameter. |
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Term
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Definition
| A statement about a population parameter. |
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Term
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Definition
| A statistical hypothesis that contains a statement of equality such as "greater than or equal to", =, or "less than or equal to". |
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Term
| Alternative hypothesis (Ha) |
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Definition
| The complement of the null hypothesis. It is a statement that must be true if Ho is false, and it contains a statement of strict inequality, such as <, "not equal to", >. |
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Term
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Definition
| Occurs if the null hypothesis is rejected when it is true. |
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Term
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Definition
| Occurs if the null hypothesis is not rejected when it is false. |
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Term
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Definition
| Your maximum allowable probability of making a type 1 error. |
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Term
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Definition
| The statistic that is compared with the parameter in the null hypothesis.The type of test used and the sampling distribution are based on the test statistic. |
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Term
| P-value (probability value) |
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Definition
| The probability of obtaining a sample statistic with a value as extreme or more extreme than the one determined from the sample data, if the null hypothesis is true. |
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Term
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Definition
The alternative hypothesis contains the less-than inequality symbol (<).
P = (area in left of tail). |
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Term
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Definition
The alternative hypothesis contains the greater-than inequality symbol (>).
P = (area in right of tail). |
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Term
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Definition
The alternative hypothesis contains the not-equal-to symbol. Each tail has an area of .5P.
P = (area in tail of test statistic). |
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Term
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Definition
| A statistical test for a population mean. |
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Term
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Definition
| A range of values for which the null hypothesis is not probable. If a test statistic falls into this region, the null hypothesis is rejected. |
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Term
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Definition
| Separates the rejection region from the non-rejection region. |
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Term
| t-Test for a mean (n < 30) |
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Definition
| A statistical test for a population mean. This test can be used when the population is normal/nearly normal, standard deviation is unknown, and n < 30. |
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Term
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Definition
| A statistical test for a population proportion 'p'. It can be used when a binomial distribution is given such that np > 5 and nq > 5. |
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Term
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Definition
| A sample selected from one population is not related to the sample selected from a second population. |
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Term
| Dependent Sample (Paired or Matched Samples) |
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Definition
| Each member of one sample corresponds to a member of the other sample. |
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Term
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Definition
| An interval, or range of values, used to estimate a population parameter. |
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Term
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Definition
| The probability that the interval estimate contains the population parameter. |
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Term
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Definition
| The probability of success in a single trial of a binomial experiment. |
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