28. In conducting a hypothesis, what is the goal of a researcher? Note: Like a prosecutor, a researcher collects evidence to "prosecute" the assumption (the null hypothesis). Put it another way: the researcher collects evidence to show that the alternative hypothesis is TRUE. Notice that we don't use phrases such as "collects evidence for the null hypothesis" or "show that the null hypothesis is true". Why? Because we already assume that the null hypothesis is true (similar to the idea that "everyone is presumed innocent" under the Court of Law). a. Collects evidence against H, (evidence against the assumption) b. Collects evidence for Ha (evidence for the researcher's belief)

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28. In conducting a hypothesis, what is the goal of a researcher?
Note: Like a prosecutor, a researcher collects evidence to "prosecute" the assumption (the null
hypothesis). Put it another way: the researcher collects evidence to show that the
alternative hypothesis is TRUE.
Notice that we don't use phrases such as "collects evidence for the null hypothesis" or
"show that the null hypothesis is true". Why? Because we already assume that the null
hypothesis is true (similar to the idea that "everyone is presumed innocent" under the
Court of Law),
a. Collects evidence against H, (evidence against the assumption)
(evidence for the researcher's belief)
(evidence for the assumption)
b. Collects evidence for Ha
c. Collects evidence for H,
с.
d.
Both a and b.
29. What is true about t distributions?
Hint: See p 413
a. There is more than onet distribution (i.e. more than one t density curve) and they are all
symmetric and centered at 0.
b. As sample size increases, the t density curve approaches the standard Normal density curve.
c. The spread of the t distributions is a bit greater than that of the standard Normal distribution.
d. All of the above.
Transcribed Image Text:28. In conducting a hypothesis, what is the goal of a researcher? Note: Like a prosecutor, a researcher collects evidence to "prosecute" the assumption (the null hypothesis). Put it another way: the researcher collects evidence to show that the alternative hypothesis is TRUE. Notice that we don't use phrases such as "collects evidence for the null hypothesis" or "show that the null hypothesis is true". Why? Because we already assume that the null hypothesis is true (similar to the idea that "everyone is presumed innocent" under the Court of Law), a. Collects evidence against H, (evidence against the assumption) (evidence for the researcher's belief) (evidence for the assumption) b. Collects evidence for Ha c. Collects evidence for H, с. d. Both a and b. 29. What is true about t distributions? Hint: See p 413 a. There is more than onet distribution (i.e. more than one t density curve) and they are all symmetric and centered at 0. b. As sample size increases, the t density curve approaches the standard Normal density curve. c. The spread of the t distributions is a bit greater than that of the standard Normal distribution. d. All of the above.
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