The Following MINITAB Output Display Presents a 95% Confidence Interval

question 13

Multiple Choice

The following MINITAB output display presents a 95% confidence interval for the difference between two means. $\begin{array}{rrrrc} & \mathrm{N} & \text { Mean } & \text { StDev } & \text { SE Mean } \\\mathrm{A} & 13 & 111.071 & 22.131 & 6.138 \\\mathrm{~B} & 15 & 97.224 & 26.446 & 6.828\end{array}$




How many degrees of freedom did MINITAB use?

• A) 26
• B) 13.847
• C) 28
• D) 35.992

Comprehend the concepts and controversy surrounding push polls.

Grasp the principles underlying the accuracy and representation of polling samples.

Recognize the effects of the internet on polling accuracy and its limitations.

Identify gender differences in political opinions and participation.

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Definitions:

Population Variances

A measure of the dispersion or spread of a set of data points in a population; it quantifies how much the data points deviate from the mean of the population.

Confidence Interval

A range of values, derived from sample statistics, that is believed to contain the true population parameter with a certain level of confidence.

Hypotheses

Propositions or assertions made for the sake of argument that can be tested with scientific methods to be supported or refuted.

Normal Distributions

A type of continuous probability distribution for a real-valued random variable, where the data tend to cluster around a mean value.