Which of the following best describes a matched pairs experiment?Group of answer choicesA matched pairs experiment effectively doubles the sample size.A matched pairs experiment is a special case of the completely randomised design.A matched pairs experiment means that the samples are independent.An experiment in which the observations are selected randomly and independently.

A teacher is experimenting with a new computer-based instruction and conducts a study to test its effectiveness. In which situation could the teacher use a hypothesis test for matched pairs? The teacher randomly divides the class into two groups. One of the groups receives computer-based instruction. The other group receives traditional instruction without computers. After instruction, each student takes a test and the teacher wants to compare the performance of the two groups. The teacher gives each student in the class a pretest. Then she teaches a lesson using a computer program. Afterwards, she gives each student a post-test. The teacher wants to see if the difference in scores will show an improvement. The teacher uses a combination of traditional methods and computer-based instruction. She asks students which they liked better. She wants to determine if the majority prefer the computer-based instruction.

Suppose a classroom teacher wants to measure whether offering candy as a reward will increase the number of times that a student raises his/her hand to answer a question in class. A study yields the following data.Row C1 C21 9 122 7 83 15 144 10 115 8 7If column 1 is the number of times that a student raised their hand to answer a question before the candy reward was implemented, and column 2 is the number of times that the same students raised their hands to answer questions after the candy reward was implemented, which of the following is the appropriate inference method to analyze these data? Matched pairs Inference for regression Two independent samples

第 5 个问题With a matched-pairs design, on which aspects is the researcher matching participants?1 分The participants’ posttest performance.The type of treatment the participants receive.The personal characteristics that might affect the dependent variable.The participants’ previous experience with research.

Suppose an economist wishes to determine the relationship between the age and price of houses. A study yields the following data:If column 1 is the price (in hundreds of thousands of dollars) of a sample of five houses from ten years ago, and column 2 is the price (in hundreds of thousands of dollars) of a sample of a different five houses from today, which of the following is the appropriate inference method to analyze these data? Matched pairs Inference for regression Two independent samples

A researcher wants to explore the relationship between the following two variables, Weight 1 and Weight 2.Suppose that Weight 1 is the weight (in pounds) of a sample of five individuals before beginning a weight-loss diet, and Weight 2 is the weight in (pounds) of the same five individuals after the diet.If we would like to test the effectiveness of the diet, which of the following is the appropriate inference method to analyze these data? Matched pairs Inference for regression Two independent samples