| | | |1.1992 | | |Mean |5.55 |Skewness Standard Error |0.48582 | | | |Mean LCL |4.33525
The normal distribution is a continuous, unimodal and symmetric distribution. For a typical normal distribution, a mesokurtic (which means to have a moderate peak and tails for a graph), definition is one that has a mean of 0 and a standard deviation of 1. While this is the case, there might be other normal distributions with means that are not 0 and a standard deviation that is not 1, for these cases, we use their means and standard deviation. For example, if a normal distribution had a mean of
CHAPTER 7—SAMPLING AND SAMPLING DISTRIBUTIONS MULTIPLE CHOICE 1. From a group of 12 students, we want to select a random sample of 4 students to serve on a university committee. How many different random samples of 4 students can be selected? a.|48| b.|20,736| c.|16| d.|495| ANS: D 2. Parameters are a.|numerical characteristics of a sample| b.|numerical characteristics of a population| c.|the averages taken from a sample| d.|numerical characteristics of either a sample or a population| ANS:
regression analysis involving two numerical variables, we are assuming: a. All of these choices are correct. b. the variances of x and y are equal. c. y has the same variation for each x value.. d. that x and y are independent. e. the distribution of x is normal. 13 The classification of student major (accounting, economics, management, marketing, other) is an example of: a. a categorical or qualitative random variable. b. a discrete random variable. c. a continuous random variable. d. a
LOM 5300 Statistical Analysis for Business Decisions Multiple Choice Questions Chapter 1 1. In a questionnaire, respondents are asked to mark their gender as male or female. Gender is an example of the a. ordinal scale. b. nominal scale. c. ratio scale. d. interval scale. ANS: b 2. The scale of measurement that is used to rank order the observation for a variable is called the a. ratio scale. b. ordinal scale. c. nominal scale. d. interval scale. ANS: b 3. Some hotels ask their guests to
skewed-right distribution with a mean of 10 minutes and a standard deviation of 8 minutes. Suppose 100 flights have been randomly sampled. Describe the sampling distribution of the mean waiting time between when the airplane taxis away from the terminal until the flight takes off for these 100 flights. a) Distribution is skewed-right with mean = 10 minutes and standard error = 0.8 minutes. b) Distribution is skewed-right with mean = 10 minutes and standard error = 8 minutes. c) Distribution is approximately
Sampling and Sampling Distributions 7-1 Learning Objectives In this chapter, you learn: To distinguish between different sampling methods The concept of the sampling distribution To compute probabilities related to the sample mean and the sample proportion The importance of the Central Limit Theorem 7-2 Why Sample? DCOVA Selecting a sample is less time-consuming than selecting every item in the population (census). An analysis of a sample is less cumbersome and more practical
Gross error is caused by an accidental error which gives invalid data; therefore it is important to redo the whole experiment. For example, the indicator used in titration to indicate the equivalence point was not added to the analyte thus the amount of titrant required to complete
PROBABILITY THEORY 1. Consider the following data: 1, 7, 3, 3, 6, 4 the mean and median for this data are a. 4 and 3 b. 4.8 and 3 c. 4.8 and 3 1/2 d. 4 and 3 1/2 e. 4 and 3 1/3 2. A distribution of 6 scores has a median of 21. If the highest score increases 3 points, the median will become __. a. 21 b. 21.5 c. 24 d. Cannot be determined without additional information. e. none of these
PYC3704-- 2011 PYC3704 (2011) Psychological Research Study Notes IMPORTANT: Read through your UNISA study guide first! Get an overview of the module and then study each Topic individually Use this guide in conjunction with the UNISA guide- it is NOT a substitute If you have previous question papers- PLEASE DON‟T RELY ON THESE, you need to UNDERSTAND the content of this module if you want to pass and carry on to complete your Honours! 1 PYC3704-- 2011 Table of Contents