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Q1) Manufacturer of mechanical widgets claims that his widgets have the average useful life of= 8,000 hours of continuous use before failure. Independent testing organization caries out a life test on a random sample of 225 of manufacturer's widgets. Sample results differ between 6000 and 9200 hours though sample mean useful life of that sample is 6235 hours with the standard deviation of 600 hours. By using a 1% significance level, test manufacturer claim against alternative that true mean useful life is less than 8000 hours.
Q2) Sociolinguist claims that at least 45% of all college graduates are functionally illiterate (according to well known accepted standards). Random sample of 500 college graduates is chosen and subjected to standard literacy test. Results point out that 212 are, actually, functionally illiterate. Does this result support original claim, or is population percentage considerably less than 45%. Use alpha=.05 for level of significance.
The professor wishes to use a random-number table to determine which letter choice should correspond to the correct answer for a question.
Using a 1% level of significance, can the hypothesis that the distributions for the student's scores are identical be accepted?
In which category is ANOVA properly classified?
Which of the following(s) can be considered (a) variable(s)?
A fair coin was flipped three times and landed heads three times. What is the probability of a head on the next toss?
Which is the probability that the median of the sample is between $17 and $20?
A study sponsored by American Express Co. and the French government tourist office found that old American stereotypes about French unfriendliness weren't true.
Is there evidence of violations of the usual ANOVA assumptions of equal variances and normal populations? Set up and perform appropriate TESTS at the α = 0.05 level of significance.
An SRS of 100 of a certain popular model car in 1993 found that 20 had a certain minor defect in the brakes. An SRS of 400 of this model car in 1994 found that 50 had the minor defect in the brakes. Let p1 and p2 be the proportion of all cars of t..
What is the probability that a cereal would either high calorie or high fiber? In other words, what is P(high calorie or high fiber)?
Determine the pairs which are significant according to LSD and what pairs are important according to Bonferroni?
What is the probability that a particular driver had exactly two speeding violations?
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