2. Four final grade test samples were taken from a high school course taught by four different professors. Use Excel to conduct an \( F \) test at \( \alpha=.05 \) to determine if the means of all these samples are from the same distribution. You may write hypothesis steps \( 1-5 \) on your printout. \begin{tabular}{cccc} Y1i & Y2i & Y3i & Y4i \\ 86 & 90 & 74 & 81 \\ 79 & 76 & 68 & 69 \\ 81 & 88 & 73 & 71 \\ 70 & 82 & 75 & 67 \\ 84 & 89 & 81 & 81 \\ & & 86 & \\ & & 70 \end{tabular}
Added by Nancy G.
Close
Step 1
This implies that any observed differences are due to random chance. - Alternative Hypothesis (\(H_1\)): At least one of the sample means is different from the others. Show moreā¦
Show all steps
Your feedback will help us improve your experience
Federico Castro and 58 other Intro Stats / AP Statistics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
A random sample of final examination grades for a college course follows. $\begin{array}{lllllllllllllll}55 & 85 & 72 & 99 & 48 & 71 & 88 & 70 & 59 & 98 & 80 & 74 & 93 & 85 & 74 \\ 82 & 90 & 71 & 83 & 60 & 95 & 77 & 84 & 73 & 63 & 72 & 95 & 79 & 51 & 85 \\ 76 & 81 & 78 & 65 & 75 & 87 & 86 & 70 & 80 & 64 & & & & & \end{array}$ Use $\alpha=.05$ and test to determine whether a normal distribution should be rejected as being representative of the population's distribution of grades.
Observations from two random and independent samples are drawn from populations 1 and 2 as shown below. Use the Wilcoxon rank sum test to determine whether or not the distributions for populations 1 and 2 differ at the Ģ = 5% significance level.
Sri K.
To test whether a college course is working a pre- and post-test is arranged for the students. The results are given below. Compare the scores with a 2 sample t-test as indicated. Use Ģ = 0.05 to test the claim. Assuming the scores are randomly selected from the two groups, and equal variances, find the test statistic and the critical value. Test Scores Pre-test 77 56 64 60 57 53 72 62 65 66 Post-test 88 74 83 68 58 50 67 64 74 60
Kari H.
Recommended Textbooks
Elementary Statistics a Step by Step Approach
The Practice of Statistics for AP
Introductory Statistics
Watch the video solution with this free unlock.
EMAIL
PASSWORD