Statistics Questions & Answers

Según este diagrama, ¿cuál de las siguientes afirmaciones es slempre verdadera? A) El rango intercuartil de los sueldos de los trabajadores es \( \$ 250.000 \). B) El promedio de los sueldos de los trabajadores es \( \$ 650.000 \). C) La cantidad de trabajadores que ganan entre \( \$ 300.000 \) y \( \$ 5(x) .000 \) es mayor que la cantidad de trabajadores que gana entre \( \$ 650.000 \) y S 750.000 . D) Exactamente un \( 50 \% \) de los trabajadores gana \( S 650.000 \). E) Un \( 62.5 \% \) de los sueldos de los trabajadores es igual o menor a \( \$ 700.000 \).

Question 3 (1 point) A linear model shows that a relationship between the number of grocery items purchased and the total cost of the grocery bill has a correlation coefficient of 0.97 . Which statement about the variables is true? Purchasing more items causes a higher cost of the grocery bill. If a grocery bill has a higher cost, then more items must have been purchased. There is no relationship between the number of items purchased and the total cost of the grocery bill. There is a strong relationship between the number of items purchased and the total cost of the grocery bill.

16 Use the Venn diagram to the right to answer questions a. through d. below. a. How many women at the party are under 30 ? 10 b. How many men at the party are not under 30 ? 16 c. How many women are at the party? 16

32) Calculate mean deviation from the follaring data \( \begin{array}{llllllll}\text { Class: } & 16-22 & 22-28 & 28-34 & 34-40 & 40-46 & 46-52 & 52-52 \\ \text { F : } 5 & 12 & 10 & 8 & 2 & 2 & 1\end{array} \)

Calculate mean deviation from the following doka Class: \( 16-22 \) \( 22-28 \) \( F: \) 5

You are given the sample mean and the population standard deviation. Use this information to construct the \( 90 \% \) and \( 95 \% \) confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenient, use technology to construct the confidence intervals. A random sample of 45 home theater systems has a mean price of \( \$ 142.00 \). Assume the population standard deviation is \( \$ 18.20 \). Construct a \( 90 \% \) confidence interval for the population mean. The \( 90 \% \) confidence interval is ( \( \square, \square \). (Round to two decimal places as needed.)

\( \begin{array}{lllll}\text { The grade point averages (GPA) for } & 2.1 & 3.4 & 2.9 \\ \text { 12 randomly selected college } \\ \text { students are shown on the right. } \\ \text { Complete parts (a) through (c) } & 1.8 & 0.9 & 4.0 \\ \text { below. }\end{array} \)

Find the critical values \( \chi_{\mathrm{L}}^{2} \) and \( \chi_{\mathrm{R}}^{2} \) for the given confidence level c and sample size n . \( \chi_{\mathrm{L}=0.98, \mathrm{n}=23} \) (Round to three decimal places as needed.)

confidence level c and sample size n.

\begin{tabular}{c|c} Find the critical values \( \chi_{\mathrm{L}}^{2} \) and \( \chi_{\mathrm{R}}^{2} \) for the given \\ confidence level c and sample size n. \\ \( \mathrm{c}=0.9, \mathrm{n}=25 \)\end{tabular}