Call me: A sociologist wants to construct a \( 99 \% \) confidence interval for the proportion of children aged \( 8-10 \) living in New York who own a smartphone. Part: \( 0 / 3 \) Part 1 of 3 (a) A survey by the National Consumers League estimated the nationwide proportion to be 0.40 . Using this estimate, what sample size is needed so tha the confidence interval will have a margin of error of 0.02 ? A sample of \( \square \) children aged \( 8-10 \) living in New York is needed to obtain a \( 99 \% \) confidence interval with a margin of error of 0.02 using the estimate 0.40 for \( p \).

The Brigham Young University statistics department is performing randomized comparative experiments to compare teaching methods. Response variables include students' final-exam scores and a measure of their attitude toward statistics. One study compares two levels of technology for large lectures: standard (overhead projectors and chalk) and multimedia. The individuals in the study are the eight lectures in a basic statistics course. There are four instructors, each of whom teaches two lectures. Because the lecturers differ, their lectures form four blocks. Suppose the lectures and lecturers are as given in the table.Which outline describes an appropriate matched pairs design?

This graph, which combines the characteristics of a stacked bar chart and a line chart, shows changes in car/truck production. Which conclusion is best supported by the data in the chart?A) Consumers have always preferred trucks to cars.B) Manufacturers think sedans and wagons Sedan/Wagon are a growing market.C) Truck SUVs have become an important part of the market. Car SUVD) Truck manufacturers make more money Truck SUV than car manufacturers.

e. your answer. A student would like to test that contribution of gender in wage is 1 \$ per hour and that contributio of one year of education is two times greater than one year of experience. What is the appropriate expression for the joint hypothesis? a. \( \quad\left(\begin{array}{llll}0 & 1 & 0 & 0 \\ 0 & 0 & -2 & 1\end{array}\right)\left(\begin{array}{l}\beta_{1} \\ \beta_{2} \\ \beta_{3} \\ \beta_{4}\end{array}\right)=\binom{1}{0} \quad \) b. \( \quad\left(\begin{array}{cccc}1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & -2\end{array}\right)\left(\begin{array}{l}\beta_{1} \\ \beta_{2} \\ \beta_{3} \\ \beta_{4}\end{array}\right)=\left(\begin{array}{l}0 \\ 1 \\ 0 \\ 0\end{array}\right) \)

а) найти числовые характеристики выборки; б) составить эмпирическое уравнение регресси У на X, считау, что данная выборка извлечена из двумерной нормальной совокуп- ности; в) построить корреляционное поле и график эмпирического vдавнения регрессии.

6 A sample of people were given two versions of a drink, the original recipe and a new recipe. They were asked, 'Do you prefer the new recipe?" \( 85 \% \) said, yes'. a Why might this result be biased? b How could you arrange the tasting and questioning to avoid bias?