Two random samples were found, one from Japan and one from Scotland. The sample variances were found for both samples. The sample variance for Japan 2.247 and the sample variance for Scotland was 0.624. Test the claim that the population variance for Scottish companies is lower than that of Japanese companies. The P-value was found to be 0.0388. Use a 5% level of significance.
(Do Not Perform The Tests! Just answer the following)
a) Write the null and alternative hypothesis
b) Is it right, left, or two tailed?
c) Is it z, t, or x square or f distribution?
d) What calculator function is used?
e) What decision would you make based on the P-value that resulted when I did the test? Use a level of significance of 5%.
Two random samples were found, one from Japan and one from Scotland. The sample variances were...
Independent random samples were selected from two quantitative populations, with sample sizes, means, and variances given below. Sample Size Sample Mean Sample Variance Population 1 2 34 45 9.8 7.5 10.83 16.49 State the null and alternative hypotheses used to test for a difference in the two population means. O Ho: (41 - H2) = 0 versus Ha: (41 - M2) > 0 Ho: (41 – 12) # O versus Ha: (H1 - H2) = 0 HO: (41 – My)...
Random samples that are drawn independently from two normally distributed populations yielded the following statistics. Group 1 Group 2 - 10 ny = 15 *, -276.3 72 - 2628 2745.76 3 - 625 (The first row gives the sample sizes, the second row gives the sample means, and the third row gives the sample variances.) Can we conclude, at the 0.01 significance level, that the two population variances, o and a differ? Perform a two-tailed test. Then fill in the...
The following observations are from two independent random samples, drawn from normally distributed populations. Sample 1 9.74, 9.04, 8.06, 6.09, 7.51 Sample 2 |[25.96, 26,27, 26,34, 39.09, 33.88, 28.87, 33.46] We are interested in testing the null hypothesis that the two population variances are equal, against the one-sided alternative that the variance of Population 1 is larger than the variance of Population 2. Define Population 1 to be the population with the larger sample variance a) What are the appropriate...
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(a) The mathematical ability of a random sample of 306 students were as- sessed by means of a test. The test regards the mathematical ability of the student as either: low, medium or high. The handedness of each subject (right-handed of left-handed) was also recorded. The data is pre- sented in the table below. Low MediumHigh Total Left-handed19 393391 1 215 74 306 114...
Independent random samples were selected from two quantitative populations, with sample sizes, means, and variances given below. Population 1 2 Sample Size 39 44 Sample Mean 9.3 7.3 Sample Variance 8.5 14.82 Construct a 90% confidence interval for the difference in the population means. (Use μ1 − μ2. Round your answers to two decimal places.) __________ to ____________ Construct a 99% confidence interval for the difference in the population means. (Round your answers to two decimal places.) __________ to _____________
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A consumer agency has compiled grocery bills (in dollars) from random samples of supermarket customers in Florida and Georgia. Assuming the population variances are not equal, use the Excel output below to identify whether each of the following conclusions is correct. You must make a selection for each option. Click once to place a check mark for correct answers and click twice to place an "x" for the wrong answers. At the 2.5% significance level, conclude that the average grocery...
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