A researcher investigated whether there was a relationship between the time spent being read to as a child (at age 3) and later performance on a second-grade English skill exam. The parental report of the amount of time spent reading to their child (on a 1 to 10 scale) and the scores on an English skills exam (on a 10 to 50 scale) were recorded for 30 students (higher scores indicate more reading time and better performance on the exam, respectively). Correlations Exam scores 518 .003 30 Reading time Reading time Pearson Correlation Sig. (2-tailed) 30 $18 .003 30 ** Correlation is significant at the 0.01 level (2-tailed). Exam scores Pearson Correlation Sig (2-tailed) 30

What statistical methods are typically used in an inferential study?

State the number of degrees of freedom available for determining the​ within-samples variation.

All other conditions being equal, does a larger sample size increase or decrease the corresponding magnitude of the z or t value of the sample test statistic?

Researchers were interested in assessing whether stress levels are different at the beginning of the semester compared to finals week. To test this, stress was measured in 5 students at the start of the semester and then again at the end of the semester during finals week. Participant Stress 1 Stress 2 Difference Score (Di) (Di - Mdiff)2 1 22 22 0   2 32 34 -2   3 24 25 -1   4 28 30 -2   5 26 29 -3     What is the observed test statistic (i.e., tobs)? Round to 2 decimal places.

Why are post hoc tests performed?

What is the difference between t-statistic and z-score

Identify the TEST for the below scenario and explain why you will choose the test for the analysis: In a hospital for one year the comorbidities of alcoholic and non-alcoholic patients were studied. Which test will be used to understand that alcoholic patients are more susceptible to comorbidities?

One advantage of a within subjects ANOVA is that the participants serve as their own comparisons true or false?