Exam 11: Understanding Statistics in Research

A researcher evaluates the internal consistency (reliability)a newly developed scale used in a pilot study and notes a Cronbach alpha coefficient of space 0.72.The researcher will:

A researcher calculates a Pearson product-moment coefficient of 0.2.The reviewer understands that this value represents:

What is the mean value in the following set of scores? A.128 B.128 C.130 D.135 E.144

When a researcher concludes that study findings are applicable to the total population,this is an example of:

When a data set has a normal distribution curve,which statement is true about the data?

Which is true about a sample that is heterogeneous?

Which describes an outlier?

A reviewer reads a research report and notes that the number of subjects in the original sample is larger than the number in the final analysis.Besides attrition of subjects,this discrepancy is likely because:

Which situation will involve the use of inferential statistics?

A researcher is analyzing the following data set.Which value represents the range? A.43 B.46 C.46 D.57 E.67 F.69 G.78

A researcher presents data to examine the relationship between income and weight and uses a scatterplot to display the results.The researcher places income level intervals along the vertical line in the graph.The reviewer knows that:

A researcher conducts a power analysis for a study in which there was no difference between control and experimental group scores and identifies a power level of 0.75 and a level of significance of 0.05.What will this researcher do?

Which describes the mode of a data set?

A review of demographic data shows that mothers with higher levels of education have fewer children.In this example,the r value is likely to be:

Assuming a normal distribution,what range of numbers would include two thirds of the scores if they ranged from 50 to 99,M = 75,and SD = 5? Between:

What is true about the chi-square test of independence?

In a study to examine motivational techniques to help adolescent smokers to quit smoking,the null hypothesis states that the intervention will have no effect on this population.The researcher establishes a level of significance of 0.01.When analyzing the data,the researcher concludes that there is a significant difference between subjects receiving the intervention and those who do not.In this study,a Type I error means there is a: