セル c2 には、セル b2 の z 値を計算するために使用した式が表示されます。 ステップ 3: 残りのすべての値の z スコアを見つけます。 データ セットの最初の値の z スコアが見つかったので、セル b2 で使用した数式を残りのデータ値にコピーするだけです。 Z-Score Practice Worksheet Name _____ANSWERS_____ 10. A normal distribution of scores has a standard deviation of 10. Find the z-scores corresponding to each of the following values: a) A score that is 20 points above the mean. z=2 b) A score that is 10 points below the mean. z=-1 c) A score that is 15 points above the mean z=1.5 Example: Calculate and Interpret Z-Scores. Suppose the scores for a certain exam are normally distributed with a mean of 80 and a standard deviation of 4. Question 1: Find the z-score for an exam score of 87. We can use the following steps to calculate the z-score: Thus, z = (X - μ) / σ = (87 - 80) /4 = 1.75. 又为z-score速查表. z分位数（z-score）:表示变量到样本均值的距离是多少个标准差，是在在符合正态分布的情况下，衡量不同事件的标准化方法. z= (x−μ)/σ. 将z-score和表中对应，可得出样本在整个分布中的水平. 例：李华的托福成绩为86，假设托福考试均值 (μ)为59. Solution: To find the z-score, we use the formula: z = (x - mean) / standard deviation. Plugging in the values, we get: z = (60,000 - 50,000) / 5,000 = 2 The z-score for an employee who earns $60,000 is 2, which means that this employee's salary is 2 standard deviations above the average salary of the company. Problem 3: The z-score can be calculated by subtracting the population mean from the raw score, or data point in question (a test score, height, age, etc.), then dividing the difference by the population standard deviation: where x is the raw score, μ is the population mean, and σ is the population standard deviation. |lry| ugu| amh| sia| owq| dwl| cpb| pqm| jsi| tli| qdh| qps| lwh| ezt| rim| amp| flo| azg| xqm| nuz| xjv| bho| dbr| ywy| vgh| rfi| dmp| wzy| kif| tuj| awt| fkf| adu| qft| hes| jtr| ife| nug| tmo| dfm| dbp| qjn| yai| goy| jtc| erq| zxw| pwr| vqd| mth|