An educational psychologist studies the effect of frequent testing on retention of course material. in one of the professor's sections, students are given quizzes each week. the second section receives only two tests during the semester. at the end of the semester, both sections receive the same final exam, and the scores are summarized below. do the data indicate that testing frequency had a significant effect on performance? use a two-tailed test at the .05 level of significance.

frequent quizzes two exams

m1 = 82 m2 = 78

n1 = 15 n2 = 15

ss1 = 100 ss2 = 110

see video lesson for details of computation of independent sample t-test (a bit different from the book)

submit:

a. show your computations

b. complete apa line for the t-test (including effect size - r2)

c. paragraph answering the research question.

In a young single person's monthly budget, $150 is spent on food, $175 is spent on housing, and $175 is spend on other items. suppose you drew a circle graph to represent this information, what percent of the graph represents housing?

Acell phone company offers two plans to its subscribers. at the time new subscribers sign up, they are asked to provide some demographic information. the mean yearly income for a sample of 40 subscribers to plan a is $45,000 with a standard deviation of $9,200. for a sample of 25 subscribers to plan b, the mean income is $64,300 with a standard deviation of $7,100. at the 0.025 significance level, is it reasonable to conclude the mean income of those selecting plan b is larger? assume unequal population standard deviations. hint: for the calculations, assume the plan a as the first sample. what is the decision rule? (negative amount should be indicated by a minus sign. round your answer to 3 decimal places.) compute the value of the test statistic. (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.) what is your decision regarding h0 ? reject h0 fail to reject h0 compute the p-value. less than 0.01 between 0.01 and 0.025 between 0.025 and 0.05 between 0.05 and 0.10 greater than 0.10

Hurry can a triangle can be constructed with angles measuring 115°,55°, and 20°? yes or no