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When comparing more than two treatments, why should you use an analysis of variance instead of using several t tests?  

A researcher selects a sample of 24 college students and has them rate their liking for two advertisements aimed at improving the image of the college. The researcher finds that liking ratings significantly differed, t = 2.900. Use omega-squared to compute the proportion of variance for this result.        

A bacterial chromosome consists of a:

The following scenario will be used for the short answer questions below.  PART 2: Short Answer Questions: Please read the instructions carefully for each short answer question and provide a complete answer to each. Note that same questions have multiple parts! SHOW ALL YOUR WORK A movie critic believes people linger in the theatre after watching a movie for different periods of time based on the genre. He recorded two different groups of movie watchers. One group watched dramas and the other comedies. The time they spent in their seats after the movie was over was recorded. The data follows:    Dramas Comedies M 14 mins 19 mins SS 180.5 130 N 10 15   Evaluate with a two-tailed test at an alpha of .05  

A sample of n = 4 scores is selected from a population with an unknown mean. The sample has a mean of M = 40 and a variance of s2 = 16. Which of the following is the correct 90% confidence interval for μ?

What is the value of (ΣX)2 for the following scores? Scores: 1, 5, 2

Nitrogen has five electrons in its valence shell. How many electrons does it need to gain to complete its valence shell?

66.       A Barr body in a mammalian female cell represents:

The average verbal SAT score for the entire class of entering freshmen is 530. However, if you select a sample of 20 freshmen and compute their average verbal SAT score you probably will not get exactly 530.  What statistical concept is used to explain the natural difference that exists between a sample mean and the corresponding population mean? __________________ error.

Based on all of the above results, write a sentence demonstrating how the results from the hypothesis test and the confidence interval would appear in a research report (using Cohen’s d, not eta-squared in the write up).