12. A newspaper article stated that the US Supreme Court received 812 letters from around the country on the subject of whether to ban cameras from the courtroom. Of these 812 letters, 806 expressed the opinion that cameras should be banned. A statistics student was going to use this sample information to estimate a 95% confidence interval for the true proportion of all American adults feel that cameras should be banned from the courtroom. What would you tell this student? a. This is a large enough sample to provide an accurate estimate of the American public's opinion on the issue. b. The necessary conditions for a confidence interval for the true proportion are not satisfied, so we should not calculate a confidence interval. c. With such a large number of people favoring the notion that cameras be banned, there is no need for formal statistical inference. d. Because the proportion of individuals in favor of the ban is larger than the confidence level, the confidence interval is not valid.

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Average

In mathematics, everyone must have heard the term average in one place or other. Almost all types of calculation require taking out an average. In everyday life, the term is used for denoting a certain amount that can be said to be a typical quantity for multiple people or objects. In other words, if a group of people possesses a certain object, then the average gives us an idea regarding the quantity of the object possessed by each person. However, this is solely based on mathematical calculation. It is important to note that most people will not strictly have the average value in a group.