Standard deviation

The risk of China and the US stock market is different with the Standard & Poor 's index for the past 10 years has a volatility of about 1.25% a day; with fuses at 7% which is about five and a half times the standard deviation. This is not a normal distribution; the probability of occurrence in reality is much higher, about once every two years, which historically was 7 times over the past 14…

The article, “Standard Error of Measurement” by Leo M. Harvill from East Tennessee State University, provided a general introduction of Standard Error of Measurement (SEM). First, it introduced the basic concepts of test reliability. An obtained score or a raw score refers to the number of points obtained by an examinee. The obtained score could be influenced by several factors such as the ambiguity of test items, the fatigue of the examinee, and these factors make the obtained score unlikely to…

1. Descriptive analysis of RR% and GR% The mean is a measure of central tendency that obtained by dividing the sum of observed values by the number of observations, n. Data points can fall above, below, or even on the mean, it is widely considered a good estimate for predicting subsequent data points. . For the retention rate (RR %), the mean is 57.41 while it is 41.76 for GR%, the dependent variable. The minimum and maximum are basically the least and highest observed value. For the retention…

descriptive statistics. These measures define the methods of summarizing a group of data by describing how spread out the data is. To describe this spread, a number of statistics are available, which are range, quartiles, absolute deviation, variance and standard deviation. Units of Enumeration These are units which data is collected in terms production of cloth - meters, weight-tons, time - hours. Units of collection and Enumeration are of three types. a) Single units : it represents single…

Discussion: The distribution of each graph is quite comparable as they have similar means and standard deviation, where the preferred hand has a mean of 16.33 and a standard deviation of 2.842 whilst the non-preferred hand has a mean of 17.2 and standard deviation of 2.848. The normal distribution graph of each can be seen below: Preferred Hand vs. Non-preferred Hand: The graphs and boxplots (Figures 1.3- 1.6) seen previously in the results indicate that the two results did not have a normal…

mean, standard deviation, and variance as well as skewness and kurtosis. For example, the variable Age contained 320 valid cases, with respondents ranging in age from 18 to 35 years. The mean age was 28.02 years with a standard deviation of 4.76 years. Emailtime and Wwwtime consisted of 320 and 317 valid cases, respectively. The mean for Emailtime was 383.99 minutes spent on email per week, whereas Wwwtime had a mean of 568.57 minutes per week. Interestingly, both displayed a large standard…

mean of 5.5 which is the average score, the median of 5.5 which is the exact middle number and the mode of 7 which is the most frequent occurring score (Salkind, 2013). There was an average deviation from the sample mean of 2.35, therefore it can be said that 95% of cases would fall between -2 standard deviation (SD) and +2SD (Loiselle et al., 2011). At -2SD is a score of 0.80 and +2SD is a score of 10.2, any scores that occur below 0.80 and above 10.2 would be considered an extreme score and…

The effect of in or out-group membership of a critic on personality sensitivity Daniel Middleton Abstract Background Group membership creates a social identity that results in in-group favourtism, as a result in-group members distrust out-group members. However, little research has been conducted into the threat that arises from whether criticism is from an in-group or an out-group member. Aim The aim of this study was to compare personality sensitivity perception…

project, limits of acceptable process variation can be analyzed. Because the quality control process that existed before was to approximately 1% defect rate, new defect rate will be calculated against this value. Polaroid set control limit at 3 standard…

While there has been an increase in the use of virtual manipulatives. Their concrete counterpart’s haven been at the head of mathematics education for decades. The use of concrete manipulatives has long been applauded as a quality instructional tool. “Students’ mental images and abstract ideas are based on their experiences. Hence, students who see and manipulate a variety of objects have clearer mental images and can represent abstract ideas more completely than those whose experiences are…