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measure of central tendency

Here is Appendix N. I need to calculate the three measure of central tendency. Also, develop a five and seven class frequency distribution table for the data. Please show steps so that I can follow it to compare my solution.

Subject:

Statistics

Topic:

All Topics

Posting ID:

5430

OTA ID:

102309

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computation of percentiles

a student took two exams and achieved the 7th highest grade on each of them. Forty three students took one of the tests(Math) and 197 students took the other test(Geography). Compare his performance on the two tests in terms of percentile ranks. In which exam did he do better? Please show computations and explain.

Subject:

Statistics

Topic:

All Topics

Posting ID:

5433

OTA ID:

102309

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principle component analysis

the experiment went as follows: 6 samples were given 18 attributes following a sensory evaluation test. these have been put into s selection of charts - the first has the Plot of loadiing and has the 18 attributes dotted across the chart, X axis is PC1 and Y axis is PC2. a second chart has the same but has the 6 samples dotted across the chart. after that i have a new selection of chart but they have X axis is PC2 and Y is PC3, again with the figures dotted on the chart. I have been asked to interpret these figures but i dont know how. PLease can you help?

Subject:

Statistics

Topic:

All Topics

Posting ID:

5437

OTA ID:

102922

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ANOVA

Response variable: personal ratings (how a subject likes or dislikes a particular concentration of a solution on a scale from 1 to 10). Independent variable 1: concentrations of a solution (5 levels: 5%,10%, 20%, 40%, 80%). Independent variable 2: two groups of subjects: Group A (sample size 50), Group B(sample size 60). I need to find out if the response is significantly different between group A and group B when people rate the five different concentrations. Is ANOVA appropriate here? If yes, what would be df for main effects, interaction, error? And what test can I use to make pairwise comparisons?

Subject:

Statistics

Topic:

All Topics

Posting ID:

5463

OTA ID:

103059

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The mean of the exponential distribution.

Prove that the mean of the exponential distribution with parameter a is 1/a .

Subject:

Statistics

Topic:

All Topics

Posting ID:

5498

OTA ID:

103563

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