Statisitics

heading 1: Independent ergodic renders from two usu solelyy distributed commonwealths accomplish the following results: nX = 10 x? = 480 sx = 30 ny = 12 y? = 520 sy = 25 a. If we assume that unknown population variances are equal, what is the 90% assertion interval for the dispute of population means? b. If we do non assume that the unknown population variances are equal, find the 90% confidence interval for the difference between the population means. judging 2: A newspaper oblige describe that quatern hundred stack in one state were surveyed and 75% were strange to a recent course decision. The same article reported that a similar survey of 500 people in another state indicated opposition by notwithstanding 45%. Construct a 95% confidence interval of the difference in popula tion proportions based on data. suspicion 3: In a random sample of 99 study Basketball Association games the home team has win 57 games. bear witness the slide fastener guess that the home wins half of all games against the alternative that the home team wins a mass of games.

Question 4: A process produces cable for the local peal company. When the process is operating correctly, cable diameter follows a popular distribution with mean 1.6 pass ones and shopworn disagreement 0.05 inch. A random sample of 16 pieces of cable set in motion diameters with a sample mean of 1.615 inches and a sample standard deviation of 0.086 inch. a. assume that the population st! andard deviation is 0.05 inch, sample at the 10% take aim against a reversible alternative the null hypothesis that the population mean is 1.6 inches. witness also the lowest take of significance at which this null hypothesis can be rejected against the two-sided alternative. b. Test at the 10% level the null hypothesis that the population standard deviation is 0.05 inch against the alternative that is bigger. Question 5: Small-business...If you want to get a full essay, order it on our website: BestEssayCheap.com

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