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Homework answers / question archive / Liberty University - BMAL 590 ALC 9 SECTION 1- WHAT IS STATISTICS 1)A company has developed a new smartphone whose average lifetime is unknown

Liberty University - BMAL 590 ALC 9 SECTION 1- WHAT IS STATISTICS 1)A company has developed a new smartphone whose average lifetime is unknown

Statistics

Liberty University - BMAL 590

ALC 9

SECTION 1- WHAT IS STATISTICS

1)A company has developed a new smartphone whose average lifetime is unknown. In order to estimate this average, 200 smartphones are randomly selected from a large production line and tested; their average lifetime is found to be 5 years. The 200 smartphones represent a 
 

2. Which of the following is a measure of the reliability of a statistical inference?
 

 

3. The process of using sample statistics to draw conclusions about population parameters is called 
 

 

4. Which of the following statements involve descriptive statistics as opposed to inferential statistics?

 

5. A population of all college applicants exists who have taken the SAT exam in the United States in the last year. A parameter of the population are 
 

 

SECTION 2- DATA COLLECTION AND SAMPLING

6. Which of the following statements is true regarding the design of a good survey?

7. Which method of data collection is involved when a researcher counts and records the number of students wearing backpacks on campus on a given day?

8. The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a videocassette recorder over the past 12 months are satisfied with their products. If there are four different brands of videocassette recorders made by the company, the best sampling strategy would be to use a 
 

9. Which of the following types of samples is almost always biased?

10._________ is an expected error based only on the observations limited to a sample taken from a population.

 

SECTION 3- PROBABLILITY

11. Bayes's Law is used to compute _
 

12. The classical approach describes a probability 
13. If a set of events includes all the possible outcomes of an experiment, these events are considered to be 

 

14. Which of the following statements is not correct?

15. The blank__________ can determine the union of two events such as event A and event B.

SECTION 4- SAMPLING DISTRIBUTIONS

16. The concept that allows us to draw conclusions about the population based strictly on sample data without having any knowledge about the distribution of the underlying population is 
 

17. Each of the following are characteristics of the sampling distribution of the mean except 
18. Suppose you are given 3 numbers that relate to the number of people in a university student sample. The three numbers are 10, 20, and 30. If the standard deviation is 10, the standard error equals 

 

19. You are tasked with finding the sample standard deviation. You are given 4 numbers. The numbers are 5, 10, 15, and 20. The sample standard deviation equals 
 

20. Two methods exist to create a sampling distribution. One involves using parallel samples from a population and the other is to use the 
SECTION 5- INTRO TO HYPOTH TESTING

21. The hypothesis of most interest to the researcher is 
 

22. A Type I error occurs when we_
 

23. Statisticians can translate p-values into several descriptive terms. Suppose you typically reject H0 at level 0.05. Which of the following statements is incorrect?

24. In a criminal trial where the null hypothesis states that the defendant is innocent, a Type I error is made when 
 

25. To take advantage of the information of a test result using the rejection region method and make a better decision on the basis of the amount of statistical evidence we can analyze the 
 

SECTION 6 – INTERFERNCE ABOUT A POPULATION

26. An unbiased estimator is 
 

27. Thirty-six months were randomly sampled and the discount rate on new issues of 91-day Treasury Bills was collected. The sample mean is 4.76% and the standard deviation is 171.21. What is the unbiased estimate for the mean of the population?
 

 

28. A 98% confidence interval estimate for a population mean is determined to be 75.38 to 86.52. If the confidence level is reduced to 90%, the confidence interval for population mean 
 

 

29. Suppose the population of blue whales is 8,000. Researchers are able to garnish a sample of oceanic movements from 100 blue whales from within this population. Thus, 
 

 

30. In the sample proportion, represented by p = x / n, the variable x refers to 
 

 

SECTION 7- ANALYSIS OF VARIANCE

31. The distribution of the test statistic for analysis of variance is the 
 

32. In Fisher's least significant difference (LSD) multiple comparison method, the LSD value will be the same for all pairs of means if 
 


33. One-way ANOVA is applied to three independent samples having means 10, 13, and 18, respectively. If each observation in the third sample were increased by 30, the value of the F-statistic would 
 

34. Assume a null hypothesis is found true. By dividing the sum of squares of all observations or SS(Total) by (n - 1), we can retrieve the 
 

35. Which of the following is true about one-way analysis of variance?


 

SECTION 8 – DECISION ANALYSIS

36. A tabular presentation that shows the outcome for each decision alternative under the various states of nature is called a 
 

37. Which of the following statements is false regarding the expected monetary value (EMV)?
 

 

38. In the context of an investment decision, blank__________ is the difference between what the profit for an act is and the potential profit given an optimal decision.

 

39. The branches in a decision tree are equivalent to 
 

 

40. Which of the following is not necessary to compute posterior probabilities?
 

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