Assume that a sample is used to estimate a population mean \( \mu \). Find the \( 99.9 \% \) confidence interval for a sample of size 75 with a mean of 44.5 and a standard deviation of 20.7 . Enter your answer as an open- interval (i.e., parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). \( 99.9 \% \) C.I. \( = \) Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

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 \( p \).

Smart phone: Among 251 cell phone owners aged \( 18-24 \) surveyed, 109 said their phone was an Android phone. Part: \( \mathbf{0 / 3} \) Part 1 of 3 (a) Find a point estimate for the proportion of cell phone owners aged 18 - 24 who have an Android phone. Round the answer to at least three decimal places. The point estimate for the proportion of cell phone owners aged \( 18-24 \) who have an Android phone is

Assume that a sample is used to estimate a population mean \( \mu \). Find the \( 99.9 \% \) confidence interval for a sample of size 75 with a mean of 44.5 and a standard deviation of 20.7 . Enter your answer as an open- interval (i.e., parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). \( 99.9 \% \) C.I. \( = \) Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

Question 1: Find the range for each of the following \( \begin{array}{ll}\text { (a) } 5,9,1,5,7,4,3 & \text { (b) } 6,7,10,8,9,9\end{array} \)

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.