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practice upload: statistics

by: Anagrace Salem

practice upload: statistics Accy 201

Marketplace > University of Mississippi > Accounting > Accy 201 > practice upload statistics
Anagrace Salem
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Introduction to Accounting Principles I
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This 1 page Class Notes was uploaded by Anagrace Salem on Thursday July 28, 2016. The Class Notes belongs to Accy 201 at University of Mississippi taught by in Fall 2016. Since its upload, it has received 13 views. For similar materials see Introduction to Accounting Principles I in Accounting at University of Mississippi.


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Date Created: 07/28/16
PSY 202 Elementary Statistics Exam 2 Study guide (Chapters 6 – 8) Chapter 6 • Normal Distribution:Atheoretical distribution with data that are symmetrically distributed around the mean, median, and mode. • Mathematically defined • Theoretical • Mean, Median, and Mode are all located at the 50th percentile • Symmetrical • The mean can equal any value • The standard deviation can equal any positive value • Total area under the curve is equal to 1.0 • The tails of a normal distribution are asymptotic • Percentiles • Ascore that has a certain percentage of scores below it. Chapter 7 • Sampling Distribution:Adistribution of all possible sample means or variances that could be obtained in samples of a given size from the same population. • Sampling Error: The extent to which sample means selected from the same population differ form one another. • Standard Error: The standard deviation of a sampling distribution of sample means. • Regardless of the distribution of scores in a population, the sampling distribution of sample means selected from that population will be approximately normally distributed. • The mean of the sampling distribution of means will equal the true population mean. • As the population standard deviation decreases, standard error decreases • As sample size increases, standard error decreases • Law of large numbers: increasing the number of observations size will decrease standard error. • The smaller the standard error, the closer a distribution of sample means will be from the population mean. Chapter 8 • Amethod for testing a hypothesis about a parameter or population, using data measured in a sample. • Purpose: to test claims or ideas about a group or population • Goal: to determine the likelihood that a population parameter, such as the mean, is likely to be true • Null Hypothesis: Statement about the population parameter (such as the mean) that is assumed to be true. Starting point to determine if null is likely to be true or not • Alternative Hypothesis: Statement that contradicts the null hypothesis.Allows us to state what we think is wrong.


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