An interaction tells you that what?

An instructor for a test preparation course claims that the course will improve the test scores of students. The table shows the critical reading scores for 14 students the first two times they took the test. Before taking the test for the second time, the students took the instructor's course to try to improve their critical reading test scores. At a = 0.01, is there enough evidence to support the instructor's claim? Complete parts (a) through (f). Student 1 2 3 4 7 8 10 11 12 13 14 Score on first test 366 449 434375 426 507501 337 347544 428 558 401 410 Score on second test 375515 497 406 381 536 455454 406 596 474 583 441 447

Please! Could you help me solving this practice problem I’m having hard time with it. Which option is right?

Write both the null and research hypothesis for the variables below. Determine whether a nondirectional or directional hypothesis should be utilized when writing the research hypothesis. (I need for all the variables) Hours of studying and academic achievement Suspension rates and criminal justice outcomes Hours of sleep and productivity Socioeconomic status and type of employment Effectiveness of incarceration and effectiveness of rehabilitation Substance exposure and asthma (speak on the relationship. i.e. does substance exposure have an effect on asthma?) Pharmaceutical medications and placebos Gender and juvenile delinquency Education level and income Class attendance and performance

The First Peoples of BC have always had a close relationship with the land. "Traditional Ecological Knowledge is, above all, local knowledge based in people’s relationship to place. It is also holistic, not subject to the segmentation of contemporary science. Knowledge about a specific plant may include understanding its life cycle, its spiritual connections, its relationship to the seasons and with other plants and animals in its ecosystem, as well as its uses and its stories." - Science First Peoples Teacher Resource Guide by First Nations Education Steering Committee To support seasonal food gathering and assess the health of plants and animals, First Peoples closely monitor seasonal changes and climate. Reliable information of weather patterns, ocean currents, and tides is crticial to safely conduct seasonal food gathering along the coast. Currently, there have been increased observations of environmental change, which is of concern to First Peoples and their relationship…

Professor Fair believes that extra time does not improve grades on exams. He randomly divided a group of 300 students into two groups and gave them all the same test. One group had exactly 1 hour in which to finish the test, and the other group could stay as long as desired. The results are shown in the following table. Test at the 0.01 level of significance that time to complete a test and test results are independent. Time 1h A 22 Unlimited 17 Column Total 39 B 43 49 92 C 64 84 148 F 12 9 21 Row Total 141 159 300 Classify the problem as one of the following: Chi-square test of independence or homogeneity, Chi-square goodness of fit, Chi-square for testing oor o Chi-square goodness of fit Chi-square test of independence Chi-square test of homogeneity Chi-square for testing oor o (i) Give the value of the level of significance. State the null and alternate hypotheses. Ho: The distributions for a timed test and an unlimited test are different. H₁: The distributions for a timed test and…

NEED HELP WITh: E, F G,H, I

Ebert’s Rating       + 0 - Total   + 24 8 13 45 Siskel’s Rating 0 8 13 11 32   - 10 9 64 83   Total 42 30 88 160 In the TV show Sneak Preview by the late Gene Siskel and Roger Ebert, the two Chicago movie critics reviewed the week’s new releases and then rated them thumbs up (+) =, mixed (0), or thumbs down (-). These two critics often saw the merits of a movie differently. The preceding contingency table summarizes the ratings by Siskel and Ebert for 160 movies. At the 5% significance level, does the data provide sufficient evidence to conclude that an association exists between the ratings of Siskel and Ebert? Use Chi-Square Independence Test and interpret your result.

A rehabilitation counselor believes that an increase in the number of social visits to a patient over the course of a week in the hospital will increase the patient's daily levels of positive mood. The counselor ensures that patients are limited to only three people during each visit. What is the alternative hypothesis for this relationship? A. H1 : ρ < 0 B. H1 : ρ > 0 C. H1 : r < 0 D. H1 : r ≤ 0

Determined by inspection weather detectors are literally the independent justify your answer it's like ABC or D