What are the different ways we can sample from a population? Explain.
What will be an ideal response?
Two ways we can sample from a population are probability samples and convenience samples. Probability samples are ones that are chosen such that everyone in the population has a specific, pre-determined chance of being selected at random for the sample. In other words, probability determines how likely any one individual is to be chosen for the sample. Convenience samples (also called purposive samples), on the contrary, do not allow individuals to be chosen with a known probability from the population. Instead, individuals are chosen from the population based on convenience of their availability for the sample. Thus, probability samples are more likely to be representative of the population, but convenience samples are much easier to select and are often used in cases where researchers want to learn about a very large population.
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Indicate whether the statement is true or false
Relaxation, a positive mood, and sleepiness occurs when we eat starchy foods because these foods increase the amount of tryptophan and, in turn, increase
a. epinephrine. b. glutamate. c. acetylcholine. d. serotonin.
If MSA = 4.0, MSB = 10.00, MSA×B = 6.00, and MSerror = 2.00 in a two-factor between-subjects analyses of variance, then FA = ______, FB = ______, and FA×B = ______.
A. 2.0; 5.0; 3.0 B. 3.0; 2.0; 5.0 C. 2.0; 3.0; 5.0 D. 2.0; 5.0; 3.0
In a study with 11 participants, what would be your criticalt score for a one-tailed test at the .05 ? level?
A. 1.372 B. 1.813 C. 2.764 D. 2.228