8. Testing for Differences in Means and Proportions: Independent Proportions Z-test
Independent Proportions Z-test: Test Statistic and p-value
The framing effect is an example of a cognitive bias, in which the beliefs and preferences of people are influenced by the way a choice is formulated (Tversky & Kahneman, 1981). To investigate this matter, a researcher prepares two versions of the exact same problem:
Out of the people who were given the first version of the problem, accepted the offer. Out of the people who were given the second version of the problem, accepted the offer.
The researcher suspects that losses evoke stronger negative feelings than costs, and plans on using an independent proportions -test to determine whether or not people are significantly more willing to accept the first offer than the second, at the level of significance.
State the null and alternative hypothesis of the proposed test.
- Would you pay to participate in a lottery that offers a chance to win and a chance to win nothing?
- Would you accept a gamble that offers a chance to win and a chance to lose ?
Out of the people who were given the first version of the problem, accepted the offer. Out of the people who were given the second version of the problem, accepted the offer.
The researcher suspects that losses evoke stronger negative feelings than costs, and plans on using an independent proportions -test to determine whether or not people are significantly more willing to accept the first offer than the second, at the level of significance.
State the null and alternative hypothesis of the proposed test.
Unlock full access