Question

Describe standardization and the roles of the normal curve, the Flynn effect, reliability (test-retest and split-half), and validity (content and predictive).

Answer 1

Answer: 1. Standardization is defined as defining uniform testing procedures an meaningful scores by comparison with the performance of a pre tested group. Normal curve is defined as the Bell shaped curve that describes the distribution of many physical and psychological attributes. Most scores fall near the average and fewer and fewer scores lie near the extremes. The Flynn effect refers to the observed rise overtime in standardized intelligence test scores, documented by Flynn in a study on IQ score gains in the standardization samples of successive versions of Stamford Bennett and Wechsler intelligence test. Reliability is defined as the extent to which a test yields consistent result, as assets by the consistency of scores on two halves of the test, on alternative forms of the test, or on retesting. Validity is defined as the extent to which a test measures or predicts what it is supposed to.

2. The mean of the normal curve is always in the center which is 100. A standard deviation is a computed measure of how much scores vary around the mean score, meaning about 68% of the scores fall within one standard deviation of the mean, now 95% of the scores are going to fall within two standard deviations around the mean and with what you have left covers about 99.7% scores are within 3 standard deviations. 

Explanation: got full credit on edge 21.

Answer 2

Explanation:

To round a number to the nearest tenth , look at the next place value to the right (the hundredths). If it's 4 or less, just remove all the digits to the right. If it's 5 or greater, add 1 to the digit in the tenths place, and then remove all the digits to the right.