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One sample with n = 4 scores has a mean of M = 12, and a second sample with n = 6 scores has a mean of  M = 8.  What is the weighted mean for the combined set of scores?    SHOW YOUR WORK.  For this  question you can use the whiteboard provided via proctorio, as well as your scrap pieces of paper. The “insert math equation” above can help you type in answers as well.   

95.       At the base of the food web in aquatic ecosystem are:

“Elementary school children spent significantly more time reading the presence of a teacher than when the teacher was absent, t(7) = 2.804, p < .05 (

A researcher computes the computational formula for SS, as finds that ∑x = 22 and ∑x2 = 126. If this is a sample of 4 scores, then what would SS equal using the computational formula?

You wanted to see how many hours a small sample of your friends studied for the statistics test. Your friends reported studying for the following set of hours:          0,  10,  2,  1,  2   From this information, what is the  variance?

Figure 13-2 In the accompanying figure, the portion of the molecule containing the anticodon is indicated by the label:

What type of VSD and other associations occur with the Taussig-Bing form of double-outlet right ventricle (DORV)?

Use the data to make a 95% confidence interval estimate of the mean difference in lingering time between those who watch dramas and those who watch comedies. Also, make sure answer is in correct format CI:[  ]

A researcher administers a treatment to a sample of participants selected from a population with µ = 80. If the researcher obtains a sample mean of M = 88, which combination of factors is most likely to result in rejecting the null hypothesis? (note you do not need to do calculations for this question).

Why is it important for DNA to be copied before cell division?