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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?
In order not to violate the requirements necessary to use the chi-square distribution, each expected frequency in a goodness of fit test must be:
Compare value of test statistics F obtained in part(2) with value of t 2 , square of test statistic for testing H 0 : β 1 =0 that was needed in test null hypothesis that true slope is 0. Interpret the results of this test.
Find the probability of winning jackpot?
Find the probability that in a given year,a) Exactly one major hurricane will strike the U.S. mainland
A sample of twenty automobiles was taken, and the miles per gallon (MPG), horsepower, and total weight were recorded. Develop a linear regression model to predict MPG using horsepower as the only independent variable. Develop another model with weig..
If probability the first truck is available is= .75, probability the second truck is available is= .50, and probability both are available is= .30, determine the probability which neither truck is available?
If is the proportion of the next 100 shoppers that buy a packet of the crackers after tasting a free sample, then the probability that fewer than 30% buy a packet after tasting a free sample is approximately.
Find the probability that the number of who consider themselves basketball fans is :
Determine the probability that mean annual snowfall during 40 randomly picked years will exceed 111.8 inches?
The sampling distribution of the average score and Suppose x' is your average pay for the 100 weeks. Then x' has approximately
Test to see if the mean cell phone bill has changed since 2004. Use a .05 level of significance for the test.
Estimate the population mean
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