Need asap a random sample of 21 wolf litters in ontario...

A random sample of 21 wolf litters in Ontario, Canada, gave an average of x1 = 4.4 wolf pups per litter, with estimated sample standard deviation s1 = 1.6. Another random sample of 8 wolf litters in Finland gave an average of x2 = 2.4 wolf pups per litter, with sample standard deviation s2 = 1.7. (b) Find an 90% confidence interval for μ1 – μ2, the difference in population mean litter size between Ontario and Finland. (Use 1 decimal place.)

A random sample of n1 = 10 winter days in Denver gave a sample mean pollution index x1 = 43. Previous studies show that σ1 = 17. For Englewood (a suburb of Denver), a random sample of n2 = 20 winter days gave a sample mean pollution index of x2 = 31. Previous studies show that σ2 = 11. Assume the pollution index is normally distributed in both Englewood and Denver. Do these data indicate that the mean population pollution index of Englewood is different (either way) from that of Denver in the winter? Use a 1% level of significance. (a) What is the level of significance? State the null and alternate hypotheses. (b) What sampling distribution will you use? What assumptions are you making? What is the value of the sample test statistic? (Test the difference μ1 − μ2. Round your answer to two decimal places.) (c) Find (or estimate) the P-value. (Round your answer to four decimal places.) Sketch the sampling distribution and show the area corresponding to the P-value.

Kirsty G.

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