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Specimens of aluminium alloy rods are tested to determine their tensile strength. The results, in MPa, are given below.
357
339
342
341
348
332
336
346
345
337
358
360
361
343
340
352
344
353
350
359
333
351
347
338
349
355
i. Draw a frequency polygon and a cumulative frequency polygon for the data. Use the cumulative frequency polygon to estimate the median strength and the inter-quartile range of the data.
ii. Determine the mean and standard deviation of the data. What percentage of the data lies within one standard deviation of the mean value?
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
The mean of a sample is 22.5. The mean of 1000 bootstrapped samples is 22.491. The bias of the bootstrap mean is
If the loss of weight of customers at the end of their first month is normally distributed with a mean of 6.7lbs and a standard deviation of 0.81lbs
what is the chance the average contents of the cans will be less than advertised and what will be the standard deviation of the number of men who help at home, based on the first survey
Give all steps of a test of the hypothesis that the corresponding population proportions are equal.
You have two unbiased estimates, e 1 and e 2 , of a quantity with variances V 1 and V 2 respectively, and covariance Cov {e1,e 2 } = C. Form a new unbiased estimate:
Which of the following studies used a participant observer approach?
Find out the range (R), variance (V) and standard deviation (s) for the given set of values:
Be sure the appropriate assumptions and conditions are satisfied before you proceed.
A frequency polygon: does not depend on one variable. True-False
P-value to test hypotheses,
Five test vehicles of each kind were crashed, with results given below. Research question: Are mean crash damages the same for these 3 vehicles?
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