A researcher investigated the effect of guilt emotion on how a decision maker focuses on the problem. A total of 162 volunteer students participated in the experiment, where each assigned to one of three emotional states (guilt, anger, or neutral) through a reading/writing task. Immediately after the task, students were presented with a decision problem where the stated option has predominantly negative features (for example, spending money on repairing a very old car). The results (number repsonding in each category) are summarized in the accompanying table. Is there sufficient evidence (at a=0.10) to claim that option choice depends on emotional state?
Specfiy the null hypothesis
Find the test statisics
Specify the rejection region
State the conclusion
Search engine A accounted for 50% of all searches, search engine B for 22% search engine C for 11% and all other search engines for 17%. Suppose that in a ramdom sample of 1065 recent internet searches, 468 used search engine A, 237 used search engine B, 119 used searcg engine C, and 241 used another search engine.
Do the sample data disagree with the percentages reported by researchers? Test using a=0.100
A. Yes because the test statistic does not fall within the rejection region
B. No, because the test statistic does not fall within the rejection region
C. No, because the test statistic falls within the rejection region
D. Yes, because the test statistic falls within the rejection region
Find a 95% confidence interval for the percentages of all internet searches used in engine A
When bonding teeth, orthodontist must maintain a dry field. A new bonding adhesive has been developed to eliminate the necessity of a dry field. However, there is concern that new bonding adhesive is not as strong as the current standard, a composite adhesive. Tests on a sample of 8 extracted teeth bonding with the new adhesive resulted in a mean breaking strength (after 24 hours). Of x bar = 5.52 Mpa and a standard deviation of s= 0.43 Mpa. Orthodontists want to know if the true mean breaking strength is less than 6.01 Mpa, the mean breaking strength of the composite level
Find the rejection region
Compute the test statistic