Which of the Following Is Indicated by the Data on Real

question 17

Multiple Choice

Which of the following is indicated by the data on real income per person for various countries over the past 100 or so years?

• A)If,in a relatively poor country,real income per person had grown by 3.5 percent per year for the last 100 years,it would be a relatively rich country today.
• B)Rich countries became richer and poor countries became poorer.
• C)In the United States,real income per person today is about four times as high as it was 120 years ago.
• D)All of the above are correct.

Grasp the concept of degrees of freedom (df) in the context of t-distributions and its impact on confidence intervals.

Recognize the shape of sampling distributions based on sample size and population distribution.

Understand the conditions and assumptions necessary for making statistical inferences.

Identify the effects of sample size and variability on the width of confidence intervals.

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