Math 221b - Study guides, Class notes & Summaries

Question 1 1 / 1 pts Given the linear regression equation, Y^=134.63−2.79X, what is the predicted value of Y^ when X=45? (Round answer to two decimal places, Example: 3.45) 9.08 Ques 1 / 1 pts tion 2 Students in an Econometrics class recorded their income, , and the total amount of money they spent, , for one week (in dollars.) Based on these data, the linear regression line was calculated as: . Choose the correct interpretation of the slope of the regression line. x y y^=51.24+0.87...

Question 1 2 / 2 pts I completed the Individual Preparation assignment before attending the Group Meeting. True False Question 2 2 / 2 pts I actively participated in this week's Group Meeting. True False While you are required to work together on this quiz, each member of the group must submit his or her own answers in order to receive credit. If needed, here's a link to the Normal Probability Applet . You will need the following data set MathSelfE When calculating anything, ple...

Students in an Introductory Statistics class at BYU-Idaho were studying prices of cold cereal at grocery stores in Rexburg. To get a sample of cold cereal prices, they went to Albertson's and rolled a die to decide which box from the left of the top shelf they would start on. They then recorded every 6th cereal after the first, moving from left to right down the shelves, recording the name, size, and price of each cereal in their sample. Is this study an experiment or an observational stud...

Question 2 1 / 1 pts Which of the following variables is/are quantitative? (Mark all that apply.) The telephone number of a randomly selected business in town. The 3 most common brands of car found in the US. Correct! The number of people in a randomly selected classroom on campus. Question 3 1 / 1 pts Students in an Introductory Statistics class at BYU-Idaho were studying prices of cold cereal at grocery stores in Rexburg. To get a sample of cold cereal prices, they went to Albertson...

Data was collected on homes for sale in Madison County as of January 2011. Information on the listings such as price, size of the home, and style were recorded. The data are recorded in MadisonCountyRealE . Create a scatterplot of the price of homes (ListPrice) compared with how old the homes are (Age). Select the answer that best describes the data illustrated in the scatterplot. Linear with a moderate negative association. Linear with a moderate positive association. Linear with a strong...

A public opinion poll surveyed a simple random sample of 1000 voters. Respondents were classified by gender (female or male) and by voting preference (Republican, Democrat, or Independent). The results are presented here: In this set of questions, we will explore the research question, “Do men’s voting preferences differ significantly from women’s voting preferences?” Use a level of significance of α=0.05.

Give the standard deviation of the sample distribution of p̂. Give your answers in decimal form and round to three decimal places. (Example: 0.398) 0.018

Students in an Econometrics class recorded their income, , and the total amount of money they spent, , for one week (in dollars.) Based on these data, the linear regression line was calculated as: . Choose the correct interpretation of the slope of the regression line.

Students in an Econometrics class recorded their income, , and the total amount of money they spent, , for one week (in dollars.) Based on these data, the linear regression line was calculated as: . Choose the correct interpretation of the slope of the regression line

L23 Quiz_ Group Meeting_ Biostatistics