CNSL 503 MOD 4 EXAM ACTUAL QUESTIONS AND

CNSL 503 MOD 4 EXAM (ACTUAL / ) QUESTIONS AND

VERIFIED CORRECTLY WELL DEFINED ANSWERS GRADED A+

What is the purpose of calculating z-scores? -----Answers--- -The purpose of calculating z-scores is to understand a score's relative standing within a distribution. The z-score standardizes scores from different data sets with different means

formula for sample mean to z-score -----Answers----divided by standard error o/square root of sample

standard normal table -----Answers----Shows the proportion of values that fall to the left (or below) of a given z-score in a normal distribution

How to find percentage above z-score -----Answers----1- p- value

hypothesis testing using a z-score -----Answers----1) State the null (H0 ) and alternative (Ha ) hypotheses.2) Determine the critical values.3) Calculate the z-score. 1 / 2

4) Compare the z-score to the critical value and determine whether to reject H0.

one-tailed test -----Answers----a directional test because it specifies whether the population mean increases or decreases after the treatment (can be left or right tail)

left tail -----Answers----decreases, Ha:u<55

right tail -----Answers----increase Ha:u>55

critical region -----Answers----represents sample values that are unlikely to occur if the treatment does not have an effect (if z-score is in critical region reject null hypothesis)

two-tailed test -----Answers----states that there will be some change in the mean; the treatment will have some effect on the population mean (not specific on increase or decrease just change)

critical rejection -----Answers----When null hypothesis is rejected because z-score falls in critical region

Two tailed critical values (alpha values) -----Answers----

0.05- 1.96

0.01- 2.58

0.001- 3.30

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