Suppose you want to study the effectiveness of calculators in College math classrooms by giving subset of the students in each classroom calculators. Would you use an experimental or observational study? and why?

Q: What surprised you and seemed to be in line with your expectations about the states with highest and…

A: Hey there, I am writing the required solution based on the above given question. Please do find the…

Q: What is Observational Study?

A: Experimental study: If the researcher influences or controls one of the variables in the study and…

Q: A criminologist studied fear of crime, age, and gender of people who were present for Hurricane…

A: Dependent variable:The dependent variable is the quantity under study based on a number of factors,…

Q: Is the scatterplot informative?

A: A scatter plot is a diagram that is used to display values for two variables for a set of data. This…

Q: Problem 3: Is there a significant interaction between the grade level and modes of learning using 5%…

A: Analysis of variance

Q: You are told that a study is a 3 x 3 ANOVA. Make up variables and conditions for such a study, and…

A: In Following example shows Make up variables and conditions for such a study, and create a diagram…

Q: College administrations are continually perplexed about how to deal with hazing issues on their…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: Before planning and conducting a study to obtain information, what should be done?

A: In this scenario, it is need to describe the activity that should be done before planning and…

Q: Provide an illustration on how Bayesian analysis is used.

A: With the help of mathematical probability, the Bayesian analysis gives an explanation about the…

Q: If there are 36 data points in a set of data, what is the number of degree of freedom?

A: The basic definition of degree of freedom says that how many observation is free that is for how…

Q: 7. A researcher observes and records the behaviors of children on the playground before lunch and…

A: A researcher observes and records the behaviors of children on the playground before lunch and after…

Q: Although, in practice, sample data are generally analyzed in inferential studies, what is the…

A: If the data consists of different methods for estimating the sample and drawing the inferences about…

Q: The local government in Leeds is worried about the increasing amount of waste households in its city…

A: Hello. Since your question has multiple sub-parts, we will solve first three sub-parts for you. If…

Q: Forty new employees hired at the same time are randomly divided into two groups. One group receives…

A: Experimental Study: If some treatments are applied on the individuals in order to observe the…

Q: A psychologist is looking at the relationship between personality characteristics and physical…

A: Given :   Heart disease No Heart disease Total Type A 32 18 50 Type B 128 22 150 Total 160…

Q: Suppose you are conducting a study about how the average U.S. worker spends time over the course of…

A: Given information: From the most recent census, The mean break time per day is 29.6 minutes. The…

Q: When conducting a retrospective cohort study what are some possible selection and information bias…

A: The study is categorised into 2 Prospective cohort study Retrospective cohort study Prospective…

Q: If a study determines the difference in average salary for subpopulations of people with blue eyes…

A: As the study determines that the difference in average salary for sub-populations of people with…

Q: It is desired to investigate whether there is a relationship between gender and occupational groups.…

A: To examine the strength of association (or) relationship between two variables the following are the…

Q: The measure of central tendency which is used for categorical data is .... ..

A: The properties of a dataset influence the choice of a central tendency measures. For categorical…

Q: A method of gathering data when individuals are paid to discuss their attitudes towards products or…

A: A method of gathering data when individuals are paid to discuss their attitudes towards products or…

Q: What variable of this study could have been controlled?

A: Controlling for a variable means measuring extraneous variables and removing them as they do not…

Q: We ask if visual memory ability for a sample of 25 art major (x=49) is better than that of engineers…

A: From the given information sample size = 25 . Sample mean = 49  Population mean = 45 and population…

Q: Is the study an experiment or an observational study ? How do you know?

A: It is an important part of statistics. It is widely used.

Q: Suppose you are conducting a study about how the average U.S. worker spends time over the course of…

A: Given information: It is given that, the mean break time per day from the most recent census is 29.6…

Q: Discuss the measures of central tendencies and the situations in which one is a better…

A: The 3 most common measures of central tendency are the mean, median and mode. 1) Mean: Or we can…

Q: What is Scatterplot?

A: Scatterplot: A scatterplot is a type of data display that shows the relationship between two…

Q: Provide three different situations to illustrate how a different measure of central tendency is…

A: Mean Mean is the most widely used measure of Central Tendency that is used in Statistical analyses.…

Q: If a study determines the difference in average salary for subpopulations of people with blue eyes…

A: From the provided information, The study determines the difference in average salary for sub…

Q: In order to determine if there was a relationship between living near power lines and a rare…

A: The objective of this question is to identify the study design to check the relationship between…

Q: Should Genetic Data be treated any different than general research information/data?

A: Genetic privacy” is a complicated concept, and a new study finds that decoding how people feel about…

Q: Suppose you are interested in investigating the association between retirement status and heart…

A: The provided table is:

Q: The city of Atlanta is considering a project that would increase walkability in many high traffic…

A: Sampling  bias may result from the method by which the reporter identifies study participants.…

Q: If a researcher failed to use a random sample, how would this affect the research conclusion?   If…

A: Any test criteria's basic assumption is to select a sample that is random. A random sample would be…

Q: Discuss an example where the test of hypothesis with three or more population means could be used.

A: Here we want to discuss the example where the test of hypothesis with three or more population means…

Q: If you are conducting a study on the academic performance of students who are registered members of…

A: A quantitative study would be more appropriate for this. This is because both the variables can be…

Q: Is this study experimental or observational? Justify.

A: In the study given , The people have been divided into groups to determine the effect of Vitamin E…

Q: what is the independent and dependent vairable in the sentence below? What are the learning styles…

A: Our aim is to find the independent and dependent vairable in the sentence below. Statement : What…

Q: What variables do Teczar find have the most significant controlled associations with women in…

A: The correlation is a statistical technique that is used for analyzing the behavior and association…

Q: Which type of observational study is described in the problem statement?

A: In this study, the viewing habits of about 7,500 households are to be recorded for the next four…

Q: A clinical psychologist is interested in determining which type of therapy is in fact more effective…

A: a) What hypothesis test would be most appropriate for answering this research question and why? Here…

Q: Why is a scatter diagram important?

A: We have to explain why scatter diagram is important

Q: According to the February 2008 Federal Trade Commission report on consumer fraud and identity theft,…

A: From the provided information, Sample size (n) = 1432 Out of which 321 complaints of identity theft.…

Q: Suppose you are conducting a study about how the average U.S. worker spends time over the course of…

A: Given the data of the average U.S worker spent time over the course of a workday. Population :…

Q: In a study of color perception, 180 men are tested, and 18 are found to have red/green color…

A: