45.  If a researcher conducts a study in which the reading ability of a class of 20 second graders is tested at the beginning and at the end of the year, the appropriate statistical procedure to analyze the results would be*a. Chi-squareb. The dependent samples t-testc. ANOVAd. ANCOVA

A researcher designs a study to measure the effect of reading a digital history textbook versus a paper history textbook on reading comprehension scores for sixth graders. She is concerned that there may be an uneven distribution of participants with high reading levels in the paper textbook group, which could influence the study results. The variable of reading level would be considered a(n)1 分dependent variable.independent variable.participant variable.fixed variable.

Question: What percentage of the variation in grades is explained by studytime andmethod?a. 8.79 %b. 35.52 %c. 59.6 %d. 77.2 %

Which of the following statistical analysis is also known as Student’s T statistics?*1 pointF - TestChi – Square TestT - TestZ - Test

A researcher is interested in whether watching an educational program on television has a positive impact on children's grades at school. The researcher records the number of days children watch an educational program over a one-month period and relates it to their grades at school. This study is best described as:Question 13Answera.quasi-experimental.b.correlational.c.experimental.d.a survey.

A chemistry professor suspects that there is a relationship between the number of classes a student misses and that student’s score on the final exam (from 0 to 100%). The professor chooses a random sample of students in Introduction to Chemistry and collects data about each student’s final exam score and number of missed days of class.Which of the following is the most appropriate statistical test to use to determine if there is a relationship between number of missed classes and final exam scores? Inference for regression Chi-squared test for independence Two-sample t-test ANOVA Matched pairs