Question

A social psychologist studying mass communication randomly assigned 82 volunteers to one of two experimental groups. Fifty seven were instructed to get their news for a month only from​ television, and 25 were instructed to get their news for a month only from the Internet. After the month was​ up, all participants were tested on their knowledge of several political issues. The researcher simply predicted that there is some kind of difference. These were the results of the study. TV​ group:

Mequals 24, S2equals 2​;

Internet​ group:

Mequals 25

​, S2equals 5.

Using the 0.01 level, what should the social psychologist​ conclude? Complete parts​ (a) through​ (c) below.

​(a) Use the steps of hypothesis testing.

Restate the question as a research hypothesis and a null hypothesis about the populations. There are two populations of interest as shown below.

Population​ 1: People who get their news from TV.

Population​ 2: People who get their news from the Internet.

The research hypothesis is that the population mean for the TV group is ___ (different, same, less or greater) the population mean for the Internet group. The null hypothesis is that the population mean for the TV group is ____(different, same, greater than or equal to, or less than or equal to) the population mean for the Internet group.

Determine the cutoff​ score(s) on the comparison distribution for the t test.

Find the t score

Answer 1