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Payne (2001) gave participants a computerized task in which they first see a face and then a picture of either a gun or a tool. The task was to press one button if it was a tool and a different one if it was a gun. Unknown to the participants while they were doing the study, the faces served as a "prime" (something that starts you thinking a particular way) and half the time were of a black person and half the time of a white person. Table 2-8 shows the means and standard deviations for reaction times (time to decide if the picture is of a gun or a tool) after either a black or white prime. (In Experiment 2, participants were told to decide as fast as possible.) (Be sure to explain some specific numbers as well as the general principle of the mean and standard deviation.)
If one invested in Stock A, Determine standard deviation of percentage return?
Use a test of the difference between proportions when answering these questions.
Suppose we wish to predict the crawling age of a particular baby when the average outdoor temperature is 25°F six months after birth.
Recognize the kind of sampling (random, systematic, convenience, stratified, cluster) employed whenever a sample of people who smoke is obtained as explained below.
Write a one-page report to Ms. Gupta presenting your conclusions regarding the market performance of Brand 1.
How many subjects would you approximately need to reduce the length of the 95% confidence interval to 2 units?
The significance level of a statistical test is equal to the probability that the null hypothesis is true.
Using a significance level of 0.05, can we conclude from this information that the course is successful in improving individuals' knowledge of Web page design?
Suppose you want to test the hypothesis that students who study one week before score different from students who study the night before. A 2 sample t-test test is run based on your data and a p-value is calculated to be 0.0219. What is the approp..
In 2010, the average age of students at UTC was 22 with a standard deviation of 3.96. In 2013, the average age was 24 with a standard deviation of 4.08. In which year do the ages show a more dispersed distribution? Show your complete work and supp..
Perform a posthoc test that is suitable if we assume that group 7 is a control group and that the other are different treatment groups and that we are only interested in finding significant treatments, not to compare them.
Calculate (rounded to the nearest tenth) The correlation between IQ and Anxiety r =??
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