Prior to Class Quiz 6_ Statistics for Business-T123PWB-2

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International School of Business, UEH *

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T123

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Statistics

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May 23, 2024

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4/25/23, 10:00 PM Prior to Class Quiz 6: Statistics for Business-T123PWB-2 Prior to Class Quiz 6 Due Mar 4 at 5:45pm Points 10 Questions 10 Time Limit 20 Minutes Attempt History Attempt Time Score LATEST Attempt 1 13 minutes 10 out of 10 Score for this quiz: 10 out of 10 Submitted Mar 4 at 5:13pm This attempt took 13 minutes. Correct! Question 1 1/1 pts In constructing a 95 percent confidence interval, if you increase n to 4n, the width of your confidence interval will be (assuming other things remain the same): about two times wider. about 25 percent of its former width. about four times wider. about 50 percent of its former width. Question 2 1/1 pts A sample is taken and a confidence interval is constructed for the mean of the distribution. At the center of the interval is always which value? https://flearn.kfo.edu.vn/courses/206/quizzes/3104 1/5
4/25/23, 10:00 PM Prior to Class Quiz 6: Statistics for Business-T123PWB-2 The population mean pu Both -' and y as long as there are not too many outliers Neither -' nor u since with a sample anything can happen Correctl The sample mean X Question 3 1/1 pts The Central Limit Theorem (CLT): applies only when py and o are known. applies best to populations that are skewed. applies only to samples from normal populations. Correctl applies to any population. Question 4 1/1 pts The Central Limit Theorem (CLT) implies that: the population will be approximately normal if n 2 30. repeated samples must be taken to obtain normality. the mean follows the same distribution as the population. Correctl the distribution of the mean is approximately normal for large n. https://learn.kfo.edu.vn/courses/206/quizzes/3104 2/5
4/25/23, 10:00 PM Correct! Correct! Prior to Class Quiz 6: Statistics for Business-T123PWB-2 Question 5 171 pts The standard error of the mean decreases when: the standard deviation decreases or n increases. the population size decreases. the standard deviation increases. the sample size decreases. Question 6 1/1 pts For a given sample size, the higher the confidence level, the: more accurate the point estimate. smaller the standard error. smaller the interval width. greater the interval width. Question 7 1/1 pts If a normal population has parameters y = 40 and o = 8, then for a sample size n = 4: the standard error of the sample mean is approximately 2. https://flearn.kfo.edu.vn/courses/206/quizzes/3104 3/5
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4/25/23, 10:00 PM Prior to Class Quiz 6: Statistics for Business-T123PWB-2 the standard error of the sample mean is approximately 10. Correctl the standard error of the sample mean is approximately 4. the standard error of the sample mean is approximately 8. Question 8 1/1 pts As the sample size increases, the standard error of the mean: may increase or decrease. Correctl decreases. increases. does not change Question 9 1/1 pts A sampling distribution describes the distribution of: a parameter. neither a parameter nor a statistic. Correctl a statistic. either a parameter or a statistic. https://learn.kfo.edu.vn/courses/206/quizzes/3104 4/5
4/25/23, 10:00 PM Prior to Class Quiz 6: Statistics for Business-T123PWB-2 Question 10 1/1 pts Sampling error can be avoided: Correctl by no method under the statistician's control. by using an unbiased estimator. either by using an unbiased estimator or by eliminating nonresponse. by eliminating nonresponses (e.g., older people). Quiz Score: 10 out of 10 https://learn.kfo.edu.vn/courses/206/quizzes/3104 5/5

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