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Home Question Bank Math Statistics Archive 2025 January 13

Statistics Questions from Jan 13,2025

Browse the Statistics Q&A Archive for Jan 13,2025, featuring a collection of homework questions and answers from this day. Find detailed solutions to enhance your understanding.

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For a data set of brain volumes \( \left(\mathrm{cm}^{3}\right) \) and \( I Q \) scores of twelve males, the linear correlation coefficient is \( \mathrm{r}=0.224 \). Use the table available below to find the critical va correlation coefficient r and the critical values, what do you conclude about a linear correlation? Click the icon to view the table of critical values of r . The critical values are (Type integers or decimals. Do not round. Use a comma to separate answers as needed.) For a data set of brain volumes \( \left(\mathrm{cm}^{3}\right) \) and IQ scores of eleven males, the linear correlation coefficient is \( r=0.672 \). Use the table available below to find the critical values of \( r \). Based correlation coefficient \( r \) and the critical values, what do you conclude about a linear correlation? Click the icon to view the table of critical values of \( r \). The critical values are (Type integers or decimals Do not round. Use a comma to separate answers as needed.) What is a scatter plot? Fill in the Blank 1 point Adata set is normally distributed with a mean of 68.42 and a standard deviation of 7.91 . An element in this set is 57 . What is the z-score for 57 ? Round the answer to the nearest hundredth. You answer must be in decimal form. \( z \)-score = type your answer... One problem that students often have is distinguishing discrete variables from continuous variables, In this week's post, please give an example of a discrete variable and an example of a continuous variable. For example, the number of cups of coffee served in a cafeteria is discrete and the amount of coffee served in a cafeteria is continuous. Reply How do you identify the relationship between two variables in a scatter plot? Fill in the Blank 1 point The heights of 200 kindergarten students at T.E. Wright Elementary are normally distributed with a mean of 40 inches and a standard deviation of 1.8 inches. Approximately how many students have a height between 37.3 inches and 44.5 inches? Your answer must be in the form of a whole number. \( \begin{array}{ll}\text { type your answer... } & \text { students }\end{array} \) Given the following dataset: \[ \begin{array}{l}37,41,76,28,51,31,89,78,45,55 \\ 83,41,27,67,25,49,74,92,74,29\end{array} \] What is the interquartile range (IQR)? \( \frac{043}{0.34} \) 8. Considera os oito dados representados a seguir. Sobre esses dados, sabemos que estão ordenados por ordem crescente, e que dois dos seus valores, \( a \) e \( b \), são desconhecidos? Sabe-se ainda que: a amplitude interquartil é igual a 12 ; Qual é o valor de \( b-a \) ? a amplitude dos dados é igual a 18 . \( \begin{array}{lllll}\text { (A) } 12 & \text { (B) } 14 & 12 & 16 & b\end{array} \) Multiple Choice 1 point A normally distributed set of 968 values has a mean of 108 and a standard deviation of 11 . Which is closest to the number of values expected to be above 125 ?
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