Valium (diazepam) is a widely prescribed antidepressant and sedative. a study investigated how valium works by comparing its effect of diazepam on sleep in seven knock‑in mice, in which the receptor is insensitive to valium, and in eight wild‑type control mice. the study found that valium reduced sleep latency in both groups with no significant difference between the groups. according to the study authors, this lack of significance "is related to the large inter‑individual variability that is also reflected in the low power ( 20%) of the test."(a) select the best explanation as to why tests having low power often fail to give evidence against a null hypothesis even when the null hypothesis is really false o because a low-power test is more likely to give type i errors. o because we have probably insisted on a significance level that is too small. o because if the difference between the null and the alternative hypotheses is large, it is more difficult to detect it. o because in order to detect an alternative which is close to the null hypothesis we need a high power test.

Which scenarios are most effectively explored by conducting an experiment? there is more than one correct answer. select all that apply. researchers want to study the effectiveness of a particular drug for treating migraines. they want to know which dosage of the drug yields the best results with the least side effects. to ensure fair results, the researchers want to ensure that participants and dosage administrators do not know which dosage participants receive. a teacher wants to plan a class fieldtrip and quickly determine where students prefer to go for the class fieldtrip. a car mechanic wants to know which of two engine brands makes better-performing engines. he wants to test the engines in identical situations and rate their performance in a way that can be fairly measured. a chemist studies the properties of a metal compound. she wants to know how the sample size of the metal affects its ability to conduct electricity. she wants to conduct the research in a controlled environment to minimize bias. a realty company wants to know the average income of its clients. the company wants to gather data income from current clients.

The perimeter of ? cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.

Item 1 use the polygon tool to draw a rectangle with a length of 4 units and a height of 2 units. one of the sides of the rectangle falls on line ef , and the rectangle has a vertex of e. each segment on the grid represents 1 unit.