The following data represent petal lengths (in cm) for independent random samples of two species of iris.Petal length (in cm) of Iris virginica: xn, 365.06.3 6.1 5.1 5.5 5.3 5.5 6.9 5.0 4.9 6.0 4.8 6.1 5.6 5.15.85.6 4.8 5.4 5.1 5.1 5.9 5.2 5.7 5.4 4.5 6.4 5.3 5.5 6.7 5.7 4.94.8 5.7 5.1 5.1Petal length (in cm) of Iris setosa x n381.41.8 1.4 1.5 1.5 1.6 1.4 1.1 1.2 1.4 1.7 1.0 1.7 1.9 1.6 141.5 1.4 1.2 1.3 1.5 1.3 1.6 1.91.6 1.51.41.4 1.61.21.9 1.51.6 1.4 1.3 1.71.51.5A USE SALT (c) Explain what the confidence interval means in the context of this problem. Does the interval consist of numbers that are all positive? all negative? of different signs? Atthe 99% level of confidence, is the population mean petal length of Iris virginica longer than that of Iris setosa?O Because the interval contains only positive numbers, we can say that the mean petal length of Iris virginica is longer.O Because the interval contains only negative numbers, we can say that the mean petal length of Iris virginica is shorter.O Because the interval contains both positive and negative numbers, we cannot say that the mean petal length of Iris virginica is longer.(d) Which distribution did you use? Why?O The Student's t-distribution was used because a, and a, are known.O The standard normal distribution was used because e, and e, are known.O The Student's t-distribution was used because o, and a, are unknown.O The standard normal distribution was used because e, and a, are unknown.Do you need information about the petal length distributions? Explain.O Both samples are large, so information about the distributions is not needed.O Both samples are small, so information about the distributions is not needed.O Both samples are large, so information about the distributions is needed.O Both samples are small, so information about the distributions is needed.

The confidence interval is used to get an interval in which the population parameter (unknown) is…

Answered: The following data represent petal…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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given this data, what will be the most appropriate way to present them?
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3.) A population has a mean of 300 and a variance of 80. If we get 160 samples from this population, what wili be the mean and standard deviation of the sampling distribution of sample mean? A.) Hg = 300 and og =0.53 B.) µg = 300 and og =0.71 C.) µg = 300 and og =6.32 D.) µg = 300 and og =80 %3D %3D
The following data represent petal lengths (in cm) for independent random samples of two species of iris. Petal length (in cm) of Iris virginica: x1; n1 = 36 5.2 5.6 6.1 6.1 5.1 5.5 5.3 5.5 6.9 5.0 4.9 6.0 4.8 6.1 5.6 5.1 5.6 4.8 5.4 5.1 5.1 5.9 5.2 5.7 5.4 4.5 6.4 5.3 5.5 6.7 5.7 4.9 4.8 5.8 5.2 5.2 Petal length (in cm) of Iris setosa: x2; n2 = 38 1.6 1.8 1.4 1.5 1.5 1.6 1.4 1.1 1.2 1.4 1.7 1.0 1.7 1.9 1.6 1.4 1.5 1.4 1.2 1.3 1.5 1.3 1.6 1.9 1.4 1.6 1.5 1.4 1.6 1.2 1.9 1.5 1.6 1.4 1.3 1.7 1.5 1.5 (a) Use a calculator with mean and standard deviation keys to calculate x1, s1, x2, and s2. (Round your answers to four decimal places.) x1=s1=x2=s2= (b) Let μ1 be the population mean for x1 and let μ2 be the population mean for x2. Find a 99% confidence interval for μ1 − μ2. (Round your answers to two decimal places.) lower limitupper limit
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Listed below are times (in minutes and seconds) that a statistics instructor recorded while riding a bicycle for five laps through each mile of a 3-mile loop. Use a 0.10 significance lev the claim that the samples are from populations with the same median. What do the data suggest? Mile 1 Mile 2 Mile 3 3:18 3:25 3:31 3:14 3:30 3:31 3:15 3:25 3:35 3:20 3:26 3:28 3:16 3:24 3:27 First determine the null and alternative hypotheses. Choose the correct answer below. A. Ho: The samples come from populations with equal medians. H₁: The samples come from populations with medians that are not all equal. D O B. Ho: The samples come from populations with means that are not all equal. H₁: The samples come from populations with equal means. O D. Ho: The samples come from populations with equal means. Compute the test statistic. The test statistic is. (Round to three decimal places as needed.) OC. Ho: The samples come from populations with medians that are not all equal. H₁: The samples come from…

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