A mathematics test, given to a set of incoming freshmen at a college, consists of five difficult math problems. Only a small number of the incoming freshmen could approach the questions well enough because these were higher-level statistics questions. This test would not be useful in separating those who failed high school math from those who aced Calculus because ofGroup of answer choicesa floor effecta ceiling effectboth

In an experiment to determine the best method by which to assess college students, a group of students were exposed to one of three types of tests. The three methods were: all multiple choice questions, all free-response questions, and a mix of question types (both multiple choice and free-response questions). The scores were recorded for each test taken. Fifteen students were used in the study, and grouped by class level (freshman, sophomore, junior, senior, and graduate). The following tables provide the results of the experiment.Class Level Multiple Choice Free-Response MixedFreshman 78 84 90Sophomore 82 90 95Junior 90 94 98Senior 88 96 100Graduate 95 98 99Below is the ANOVA table.ANOVA Source of Variation SS df MS F P-value F critClass Level 337.0667 4 84.2667 22.0786 0.000222 3.8379Testing Method 242.8 2 121.4 31.8079 0.000156 4.4590Error 30.5333 8 3.8167 Total 610.4 14  What would you tell the researchers about their results?Group of answer choicesAt the 0.01 level of significance, there is a significant difference among testing methods, and blocking, based on Class Level was useful in the analysis.At the 0.01 level of significance, there is a significant difference among testing methods, but blocking, based on Class Level was NOT useful in the analysis.These results reveal no significant differences.Graduate Students score significantly better than Freshman, regardless of the testing method.

If a test was generally very easy, except for a few students who had very low scores, then the distribution of scores would be

A mathematics test that uses questions from the realms of banking, international finance, and the stock market is likely to favor members of which group, compared to the others?students from affluent family backgroundsstudents from lower socioeconomic backgroundsstudents from rural communitiesstudents from urban communitiesSubmit

30 randomly selected statistics students were first given 20 multiple-choice questions and then 20 open-ended questions – all on the same material. The lecturer was interested in determining which type of questions the students scored higher, on average. This experiment is an example of ______. a. a test of variances b. a two sample test of means c. a paired t test d. a two sample test of proportions

A student believes that the average grade on the quiz in Math is greater than 85. She plans on taking a sample to test her belief. The correct null hypothesis is Group of answer choicesPopulation mean is greater than or equal to 85Population mean is less than or equal to 85Population mean is less than 85Population mean is greater than 85