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Data: A researcher examines the results of two separate studies. In the first study, the difference between Group A and Group B is two points but the standard error is large and the difference is not significant. In the second study, the difference between Group A and Group B is also two points but the standard error is small and the difference is significant.
Instruction: Answer this: What might be the reason for the difference in the standard error across the two studies?
Suppose the mean test scores for a college enter exam is normally distributed with mean = 78 and standard deviation = 12. a). If an individual student is selected at random, what is the probability that this student's score is over 80?
Let X denote the number of defective items in the sample, and let Y denote the number of non-defective items. Find £( X - Y).
Write a program to allow you to compare the strategies play-the-winner and play-the-best-machine for the two-armed bandit problem
Select three situations in psychology where you, the research psychologist, would be concerned about effect size in your research endeavor.
a) Estimate the confidence interval of the difference between the two means with 80% confidence level. (show all work).
Determine the range of values containing 50% of the population of x. From a large sampling (N>5000), we find that x has a mean value of 5.2 units and a standard deviation of 1.0 units.
Suppose the amount of minutes used per month is distributed normally with a mean of 700 minutes and a standard deviation of 120 minutes. What is the probability that more than 820 minutes were used?
Using Excel, conduct a regression analysis for the following data comparing vehicle weight with fuel efficiency, including:a.?Trendline chart b.?Equation c.?Correlation Coefficient
Use this data with 0.05 significance level to test the claim that the fatality rate is higher for those not wearing seat belts.
the proportion of credit-card holders who pay their bill in full each month is 20 the other 80 make only a partial or
Continuing the previous exercise, use the normal approximation to the binomial to answer each of the questions posed in parts a through f.
Let X be the number of accidents per week at the Hillsborough Street roundabout by the NCSU Bell Tower. Assume X varies with mean 2.2 and standard deviation
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