y x Question 12 The diagram shows the graph of the curve y = ( x + k )(2 − x) , where k is a constant. The curve meets the y axis at A and the x axis at B and C as shown. (a) Write down the coordinates of B and find the value of k. (b) Find the coordinates of A. (c) Write down
Interpretation of Confidence Interval (1 Question) • Confidence Intervals (CI) measures how reliable an estimate is. More specifically, it is a range of plausible values for a parameter (such as a mean) based on a sampled population. o Narrow confidence intervals suggest precise answers. A wide confidence intervals suggest we know little about the population. • When is an IID sample from a population t is a predetermined constant that depends on the sample size n and desired confidence level.
1.328 b. 2.539 c. 1.325 d. 2.528 ANSWER: a -go to the t-dtistrubution and use α=0.20 or confidence of 80% and use dof=19 3. Read the t statistic from the table of t distributions and circle the correct answer. A one-tailed test (upper tail), a sample size of 18 at a .05 level of significance t = a. 2.12 b.
Temperature (measured in degrees Fahrenheit) is an example of ratio data. A. True B. False 7.) If you randomly sample 50 students about their television viewing habits at one point in time, the data collected would be referred to as cross-sectional data.
3. Methods System dynamics is a methodology that combines analysis and synthesis, allowing observe the relationships of different information flows between the structures of a system, obtaining as a result the causal diagram. This last facilitates the distinction of feedback mechanisms between the actors of a system. Besides, generate a mental notion of mathematical model to design, facilitating its construction. Thereby demonstrating how the organizational structure, policies and delays in decision making, interact and influence the success of a company or system (Forrester, 2013).
The analysis of statistical power is done either retrospectively, which means post hoc, or prospectively, which implies a priori. The power of a statistical test is given as 1-β, where β (beta) is the Type II error and it is the probability that the researcher fails to reject the null hypothesis when it is false. When β is less than or equals to .2, the statistical power is said to be statistically powerful because its value would be greater than .8. According to Howell (2002), the statistical power of a test statistic like the independent t test is determined by the following three (3) parameters: 1. The size of the sample per group (N) 2.
A test is considered valid when it measures the way it says it does. Content validity, construct validity, and criterion validity are the three types of validity. Content validity measures how well a test samples a universe of items. Construct validity examines how well a test reflects an underlying construct or idea behind a test or measurement tool. How well a test reflects some criterion that occurs in either present or future is criterion validity.
a they are zeros between nonzero numbers. b they are zeros to the right of the decimal point AND at the end of the number. c,d,g they are zeros to the left of a written decimal point and right of a nonzero number. e,f Number Significant Figures a 5.2357 5 b 5.0057 5 c 25.00 4 d 5.2350 5 e 500 1 f 500. 3 g 500.0 4 Examples Suppose you are presented with a problem where you need to calculate the area of a small rectangle.