R Assignment 4 - Kevin Pham

The r code for side by side boxplot of vitamind v newage and vitamin d v country. Scatterplot code for relationship between vitamin d level and age.

How to find independent and defendant variables

An international relations professor is supervising four master's students. Information about the students is summarized in the table. Student Name | Student Number| Area of Intere st GPA 914589205 Anna Africa 3.44 Pierre 981672635 Middle East 3.51 Juan 906539012 Latin America 3.71 Yoko 977530271 Asia 3.45 Identify the variables and determine whether each variable is quantitative or qualitative. student number: qualitative; area of interest: qualitative; GPA: quantitative student number: quantitative; area of interest: qualitative; GPA: quantitative student number: quantitative; area of interest: qualitative; GPA: qualitative student number: qualitative; area of interest: qualitative; GPA: qualitative

The residents of a housing development for senior citizens have completed a survey whereon they indicated how physically active they are and how many visitors they receive each week. Are these two varibles related for the 10 cases reported below?

Suppose you were to collect data for the following pair of variables, gasoline: number of miles driven since your last fill up, gallons of gas remaining in your tank. You want to make a scatterplot. Which variable would you use as the explanatory variable? number of miles driven since your last fill up gallons of gas remaining in your tank Which variable would you use as the response variable? O number of miles driven since your last fill up gallons of gas remaining in your tank Would you expect to see a positive or negative association? positive negative O neither

Define the term Independent Variable?

Identify the independent (or quasi-independent) and dependent variables in the following examples. Also have identify the type of manipulation used for the independent variable and the scales of measurement for the dependent variable(s). Discuss each example and consider any confounding variables that may pose a problem for the study. Researchers design a study to measure responses of subway passengers to information announced over the intercom. The same announcement will be made by the conductor, but in one condition, a bell noise will precede the announcement. At the next stop, passengers will be interviewed to determine whether they heard they announcement and if they could decipher the message.

I need help with identifying the independent and dependent variables in excel.    Explain the step-by-step procedures in excel.

15 wheelchair users were randomly assigned to three groups with 5 in each group. These participants navigated in virtual-reality settings. Group 1 participants were in the virtual-reality setting (a building) as wheelchair users. Group 2 participants were in the virtual-reality setting in a wheelchair pushed by a walking person. Group 3 participants walked without aid in the virtual-reality setting. Joan measured the time each participant needed to complete the navigation of the virtual-reality setting. What is the independent variable(s)?

Suppose you have access to a database with the variables listed below. Choose two variables you are interested in exploring that may be related (a predictor and outcome). Which variable is your y (outcome) and which is your x (predictor)?  *Hint: which one may predict the other? Example: hot weather may predict sunburns.

A study was done to identify variables that might produce high click counts on Twitter. You and 14 of your friends collect data on all of your tweets for a week. You record the number of click counts, the length of each tweet, the outside temperature, whether it is raining, the time of day, and the day of the week. Classify each of the variables as explanatory or response. click counts V[ Choose ] response explanatory length of each tweet Choose] outside temperature [ Choose ] raining [Choose ] time of day [Choose ) day of week [ Choose ] >

III. A researcher is interested in what type of bait attracts the most moths. The number of moths in a trap was recorded for traps that were in different locations, and used different baits. The data is in the file Trap.csv, with the following columns: Column 1. Moths: The number of moths in the trap Column 2. Location: The location of the trap on a tree Top, Middle, Lower, Ground. - Column 3. Bait: Chemical The bait used - Scent, Sugar, (a) Plot the interaction plot. Does there appear to be an interaction effect? Explain your answer. (b) Find the group means for Location. (c) Find the group means for Bait. (d) Find the group means for all treatment levels. (e) Do you believe that the number of moths trapped is different for all Locations? Explain.

A survey was conducted on how many texts (in average) students receive during an in-person class time. A survey data in a class in a particular day is given in the table. Number students Number of texts 1 20 2 14 12 4 5 If the average number texts that students received during this class time is 3, then determine the number of students (the value of x) that received 5 texts during the class time on that particular day.

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A quasi-independent variable is most similar to and consistent with which of the following terms? A. control group B. manipulation C. Non-equivalent groups research study D. pre-post research study

There are three types of bike used in the Metro bike system as standard, electric, and smart. We want to make a comparison of standard bikes and the other two types. Make a new variable called standard. This variable should have “yes” values for bikes that are standard and “no” values for bikes that are electric or smart.   Using the R code

Read this same passage.  And fill the boxes that what are number of rows and columns when the last question is given.

Factorial designs allow us to study both (blank) effects of the independent variables on the dependent variables. A. Main and interactive B. Symbiotic and dichotomous C. Dependent and independent D. Rank order and correlational