1. We have seen repeatedly that experiments and non-experiments differ by the feature of manipulation (i.e., inclusion of a true independent variable). Quasi-experiments are (Fill in the bank below with a description that explains "quasi-experiment" and how it is different from designs covered in chapter 5 and chapter 6 of the textbook.) 2. Compared to experiments with control features, quasi-experiments have lower validity because For each numbered design below, describe it and provide an example of it.| Description/Features Example Name of Design One-Group Posttest Only One-Group Pretest-posttest Nonequivalent Posttest Only Nonequivalent Pretest-Posttent Interrupted Time Series (with Nonquivalent Groups) Pretest-Prottest Design with Switching Replication Switching Replication with Treatment Removal Description Name of Threat to Internal Validity Example History Maturation Testing (usually includes practice and fatigue effects you have read about before) Instrumentation Regression to the Mean Spontaneous Remission