Reading 7: Statistical Concepts and Market Returns - LOS a

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Q3. A summary measure that is computed to describe a population characteristic from a sample is called a:

A) census.

B) statistic.

C) parameter.

Q4. Which one of the following alternatives best describes the primary use of inferential statistics? Inferential statistics are used to:

A) summarize the important characteristics of a large data set based on statistical characteristics of a smaller sample.

B) make forecasts based on large data sets.

C) make forecasts, estimates or judgments about a large set of data based on statistical characteristics of a smaller sample.

Q5. Which one of the following alternatives best describes the primary use of descriptive statistics? Descriptive statistics are used to:

A) summarize important characteristics of large data sets.

B) obtain data about the characteristics of any data set that can be used to assess the likelihood of the occurrence of future events.

C) arrive at estimates regarding a large set of data regarding the statistical characteristics of a smaller sample.

Q6. What is the main difference between descriptive statistics and inferential statistics? Descriptive statistics are:

A) used to summarize data while inferential statistics are used to obtain precise information about a large data set.

B) used to make forecasts about the likelihood of upcoming events while inferential statistics are used to summarize any data set.

C) used to summarize a large data set while inferential statistics involves procedures used to make forecasts or judgments about a large data set by examining a smaller sample.

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发表于 2008-12-31 16:20 | 只看该作者

答案和详解如下：

Q3. A summary measure that is computed to describe a population characteristic from a sample is called a:

A) census.

B) statistic.

C) parameter.

Correct answer is B)

When sampling from a portion of the population, you compute a statistic to make inferences about the population.

Q4. Which one of the following alternatives best describes the primary use of inferential statistics? Inferential statistics are used to:

A) summarize the important characteristics of a large data set based on statistical characteristics of a smaller sample.

B) make forecasts based on large data sets.

C) make forecasts, estimates or judgments about a large set of data based on statistical characteristics of a smaller sample.

Correct answer is C)

Inferential statistics are used mainly to make forecasts, estimates or judgements about a large set of data based on statistical characteristics of a smaller set of data.

Q5. Which one of the following alternatives best describes the primary use of descriptive statistics? Descriptive statistics are used to:

A) summarize important characteristics of large data sets.

B) obtain data about the characteristics of any data set that can be used to assess the likelihood of the occurrence of future events.

C) arrive at estimates regarding a large set of data regarding the statistical characteristics of a smaller sample.

Correct answer is A)

Descriptive statistics are used mainly to summarize important characteristics of large data sets.

Q6. What is the main difference between descriptive statistics and inferential statistics? Descriptive statistics are:

A) used to summarize data while inferential statistics are used to obtain precise information about a large data set.

B) used to make forecasts about the likelihood of upcoming events while inferential statistics are used to summarize any data set.

C) used to summarize a large data set while inferential statistics involves procedures used to make forecasts or judgments about a large data set by examining a smaller sample.

Correct answer is C)

Descriptive statistics are used to summarize a large data set while inferential statistics are based on procedures used to make forecasts or judgments about a large data set by examining a smaller set of data.

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