(b) Find the area under the standard normal curve to the right of \( z=-2.26 \) The area to the right of \( z=-2.26 \) is

To determine which window cleaner is most effective, Thad washes half of the windows in his house with one brand and the other half with a different brand. He then compares the results to draw a conclusion about which cleaner is most effective. What kind of statistical study did Thad conduct? A. observational study B. experiment C. survey D. theoretical study

700) Debido a los malos resultados de la prueba de Matemática el profesor decide subir las notas en dos décimas. ¿Cuál de los siguientes estadígrafos no cambia? I) Media II) Rango III) Varianza A) Solo I B) Solo II C) Solo III D) Solo II y III E) I, II y III

63. Sea \( \mathbf{p} \) la desviación estándar de los 5 primeros números primos. Si se resta 1 , a cada uno de estos números, entonces la varianza del nuevo conjunto de números es A) \( p-5 \) B) \( 5-p \) C) \( (p-5)^{2} \) D) \( p^{2} \) E) \( p^{2}-5 \)

Example. The data of samples from 2 populations were collected and recorded below for \( \dot{x}-t_{1}{ }^{2}{ }_{x_{1}} \), and \( x_{2} \) \[ \begin{array}{l} n_{1}=50, \quad \bar{x}_{1}=\left[\begin{array}{l} 8.3 \\ 4 \cdot 1 \end{array}\right], \quad s_{1}=\left[\begin{array}{ll} 2 & 1 \\ 1 & 6 \end{array}\right] \\ n_{2}=50, \bar{x}_{2}=\left[\begin{array}{l} 10.2 \\ 3.9 \end{array}\right], \quad s_{2}\left[\begin{array}{ll} 2 & 1 \\ 1 & 4 \end{array}\right] . \end{array} \]

What is a scatter plot?