Chapter 15
Statistical Inferences Based on Two Samples
True/False
1 . An independent sample try things out is an experiment in which there is no relationship between the measurements in the diverse samples. Solution: True Difficulty: Medium
2 . When assessment the difference among two proportions selected by populations with large independent samples, the Z check statistic is employed. Answer: The case Difficulty: Moderate
3. In forming a big sample selfconfidence interval for [pic], two presumptions are required: 3rd party samples and sample sizes of in least 31. Answer: The case Difficulty: Channel
4. In testing the equality of population variances, two presumptions are required: impartial samples and normally allocated populations. Response: True Difficulty: Medium
five. In an test involving matched pairs, a sample of doze pairs of observations can be collected. The level of freedom to get the capital t statistic is definitely 10. Answer: False Difficulty: Medium
6th. When comparing two independent human population means, in the event n1 sama dengan 13 and n2 sama dengan 10, degrees of freedom for the to statistic is 22. Answer: False Difficulty: Easy
7. When comparing the variances of two normally distributed foule using impartial random samples, if [pic], the calculated value of Farrenheit will always be corresponding to one. Solution: True Problems: Easy
8. In testing the difference between two populace variances, it is just a common practice to calculate the Farrenheit statistic so that its benefit is always more than or equal to one. Response: True Difficulty: Medium
on the lookout for. The Farrenheit statistic can easily assume either a positive or possibly a negative benefit. Answer: Phony Difficulty: Convenient
10. There are two types of machines called type A and type B. The two type A and type B may be used to produce a specific product. The production manager desires to compare productivity of the two machines. He assigns each of the fifteen personnel to the two types of machines to compare the hourly development rate of the 15 workers. In other words, each worker functions machine A and machine B for one hour every. These two selections are 3rd party. Answer: Bogus Difficulty: Medium (REF)
eleven. In tests the difference between two means from two independent foule, the sample sizes need not be equal in order to use the Z . statistic. Solution: True Problems: Medium
12. In testing the difference between means of two normally allocated populations employing large impartial random samples, the sample sizes through the two populations must be equivalent in order to use a Z statistic. Answer: False Difficulty: Easy
13. In testing the difference between the way of two normally distributed masse using significant independent arbitrary samples, the alternative hypothesis shows no distinctions between the two specified means. Answer: False Difficulty: Easy (REF)
14. In testing the difference between the means of two normally sent out populations employing large selfemployed random trials, we can simply use a twosided test. Response: False Problems: Easy
15. In tests the difference between means of two independent populations, if nor population is generally distributed, then the sampling circulation of the big difference in means will be approximately normal given that the total of the sample sizes obtained from the two masse are at least 30. Response: False Difficulty: Hard
of sixteen. When comparing two population means based on impartial random samples, the put estimate in the variance is used if both equally population normal deviations will be known. Solution: False Problems: Hard
17. Assume that our company is constructing selfconfidence interval intended for the difference in the means of two populations based on independent arbitrary samples. In the event that both sample sizes [pic] and the circulation of the two populations are highly skewed, then a confidence period for the in the means can be constructed using the capital t test figure. Answer: Fake Difficulty: Hard
18. In the event the limits of the...

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