En una clase de matemáticas, los estudiantes registraron la longitud de sus lápices en centímetros. Los resultados son los que se muestran en la tabla. ¿Cuál es la longitud más comun de los lápices en centimetros?

Activity 1 (Measures of Relative Position) Kindly answer this by group, with at most 5 members for each group. Answer this on a whole sheet of paper. 1. Median Income: In 2009 , the median family income in the United States was \( \$ 49,777 \). (Source: U. Census Bureau) If the 90 th percentile for the 2009 four-person family income was \( \$ 137,632 \), find th percentage of families whose 2009 income was a. more than \( \$ 49,777 \). b. more than \( \$ 137,632 \) c. between \( \$ 49,777 \) and \( \$ 137,632 \)

The first step involved in calculating the Pearson correlation coefficient is to sum all the scores square all the scores calculate the standard deviation for each variable

9 A \( 99 \% \) confidence interval for the mean mass of steel sheets produced in a factory is \( (30.37 \mathrm{~kg}, 32.43 \mathrm{~kg}) \). This interval is based on a random sample of 36 steel sheets. Find a \( 95 \% \) confidence interval for the mean mass of steel sheets, assuming that the masses of steel sheets are normally distributed.

Many investors and financial analysts believe the Dow Jones Industrial Average (DJIA) gives a good barometer of the overall stock market. On January \( 31,2006,9 \) of the 30 stocks making up the DJIA increased in price (The Wall Street Journal, February 1, 2006). On the basis of this fact, a financial analyst claims we can assume that \( 30 \% \) of the stocks traded on the New York Stock Exchange (NYSE) went up the same day. A sample of 76 stocks traded on the NYSE that day showed that 10 went up. You are conducting a study to see if the proportion of stocks that went up is is significantly less than 0.3 . You use a significance level of \( \alpha=\ldots 2 \). What is the test statistic for this sample? Use \( \hat{p} \) rounded to 4 decimal places. (Report answer accurate to 4 decimal places.) test statistic =

Which of these values of the correlation coefficient indicates the weakest relationship between two variables? -0.30 -0.18 0.03 0.42