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A sample of n=9 scores is obtained from a normal population distribution with o-=12. The sample mean is M=60.
a- with a two-tailed test and o=.05,use the sample data to test the hypothesis that the population mean is u=65.
b- with a two-tailed test and o=.05, use the ample data to test the hypothesis that the population mean is u=55.
c- In parts (a) and (b) of this problem, you should find the u=65 and the u=55 are both acceptable hypotheses. Explain how two different values can both be acceptable.
Compute the 99% confidence interval for the percentage of packages that are delivered damaged in the population.
Your company builds roads, bridges, schools and other multi-million dollar public construction projects. Competitive bids are made for the contracts to undertake these projects. For each project there are three costs:
If new inspector measures 101 stampings with variance of 0.13 square inch, test at 0.05 level of significance whether inspector is making satisfactory measurements. Suppose normality.
What is the 95% confidence interval estimate of the population mean cost for a prescription of Zocor?
Analyze whether or not patients undergoing this treatment are illustrating significant change from baseline to 3 months afterward. Report a p-value.
a. State the appropriate hypotheses for your significance test. b. Use the sample results to compute the test statistic and the p-value.
Prepare an analysis of your survey. Determine if you have used the appropriate measures to research your business problem, and identify the level of measurement being used for each of your survey questions.
What proportion of the hearing loss in all the workers was attributable to not wearing earplugs?
A researcher studies the effect of cognitive psychotherapy on positive self-regard. The number of positive statements made about oneself is recorded for each participant during the first meeting.
Utilizing the .05 level, do the results support the psychologists' theory. Elucidate your answer to somebody whom has never had a course in statistics.
A catering company is buying equipment in order to set up their own store. They have a choice of two ovens that they can purchase for the store.
Report the t-value, whether you accept or reject Ho, and whether the difference was significant in a brief sentence.
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