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A group of researchers studied the effect of global environmental change on grazing lands. Their article reported the results of 171 different hypothesis tests. Of these tests, 4 were determined to be statistically significant at the 0.05 level.
Your response must include StatCrunch outputs to support your answers.
Write the null and alternative hypotheses you would use to test the following situation.
in a random telephone survey to estimate the proportion of households with a personal computer 720 out of 960
a large manufacturing firm tests job applicants who recently graduated from college. the test scores are normally
If 3 or fewer are defective, the lot is accepted. Based upon their sampling plan, what is the probability that a lot of 10 percent defective will be accepted?
Determine the 95% confidence interval for true percent of car owners in this city who received the speeding ticket this year. Explain your results to nearest hundredth of percent.
Random sample of workers at each of three plants. Research question: Are the mean hourly productivity levels the same for workers in these three plants?
Is there significant evidence that this production run doesn't meet specifications? Use a 1% level of significance.
Half of the 1000 emloyees were involved in some type of exercise. What is the probability that an employee will have a cold next year?
Calculate x2, s2 and s for the expense data. Show that the two different formulas for calculating s2 give the same result.
A sample of 19 albino Hungarian banded aardvarks was examined for nose length. Since this is a small sample, how various degrees of freedom will be used to find the t-score.
What is the probability of selecting 10 production employee at random on a hot summer day and finding that none of them are absent.
Find the probability that for a randomly selected office hour, the number of student arrivals is 3. (b) What is the probability that he will get at most 5 students in a randomly selected office hour?
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