SCOM 388 EXAM 2

What is an acceptable level of Cronbach's alpha for a reliability test?

>.9 is excellent, all the way down to .5 which is unacceptable

What does it mean that you can reject a null hypothesis or you can support a hypothesis?

It means that the results of the experiment matched with what you predicted, you always want to be able to reject the null hypothesis.

Do you know when you need to run a reliability test?

When you would want to test the consistency or agreement of results in relation to one another, not necessarily whether or not they are valid based on the hypotheses or what you are testing.

When can you reject a null hypothesis? When can you support a hypothesis?

You can support a hypothesis when the results match it. This is when you would reject the null.

Can you choose the correct type of statistical analysis when given a hypothesis or a research question?

Clarify the IV and DV, decide if it's Nominal/Ordinal, Interval/Ratio, select appropriate statistical analysis for testing

How do you run descriptive analyses? For example, using SPSS software, what do you need to click and which test do you need to run? Do you know which statistics you need to report from a descriptive table?

Click analyze--> descriptive statistics--> select the variables you want to measure and then click okay. You need to read the mean and standard deviation from the descriptive table

Do you know the general steps in the data analysis process?

Data screening (for accuracy, missing data, outliers), before running any tests (cronbach alpha scores for multiple item scales, calculate the average scores), demographic information, test hypothesis/research questions

What are the differences between descriptive statistics and inferential statistics?

Descriptive stats uses data to provide descriptions of data (using charts, graphs, etc.) Inferential statistics makes inferences and predictions about a population based on a sample of data taken from the population in question.

Can you make a null hypothesis when given a hypothesis?

Falsification of the hypothesis

Which descriptive statistics need to be reported for nominal / ordinal level measurements and interval / ratio level measurements?

Nominal/Ordinal: (categorical data), frequencies and percentages Interval/Ratio: (numerical data), mean and SD

Statistical inference

Process through which inferences about a population are made based on certain statistics calculated from a sample of data drawn from that population.

What does the statistical significance mean? What is a statistically significant level?

Statistical significance is the way of testing the unlikeliness of an experimental result (as if the null hypothesis were to be true). If the P value is observed to be less than or equal to the significance level, we can reject the null hypothesis. A statistically significant level is P<.05

Can you distinguish between one- tailed hypotheses and two-tailed hypotheses?

Two tailed you are testing for the possibility of the relationship in both directions (ex testing the hypothesis and null hypothesis), one tailed you are testing for the possibility of the relationship in one direction and completely disregarding the possibility of a relationship in the other direction. You would use a one- tailed hypothesis when you consider the consequences of missing an effect in the untested direction and conclude that they are negligible and in no way irresponsible or unethical.

What do you need to do after checking the Cronbach 's alpha level of survey questions?

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