Suppose we want to compare the GPA for students in at least three different social classes (Upper, Middle, Working).  We obtain GPA records for a randomly selected set of 30 students, ten from each social class group.  What test should you use and why?

Q: orty studens ha dass at an ney can speak. Complete the table. Foreign Language Gender Chinese…

A: Explanation of the answer is as follows

Q: rcher conducts a between-subjects experiment. He compares three treatment conditions and produces 25…

A: Between-subject is the study in which every treatment is given to different subjects and each…

Q: A group of students were surveyed about the number of siblings they have. The frequencies and…

A: Solution: From the given information, the table of frequencies and relative frequencies of their…

Q: be purchasing hundreds of these machines. To make sure it made the best decision, the company…

A: Given: Machine 1 Machine 2 Machine 3 24.5 28.4 26.1 23.5 34.4 28.3 26.4 29.5 24.3 27.1…

Q: How many people took part in this survey? * The table shows data about what type of phones that…

A: To arrange the data of two categorical variables, two ways contingency table is used. The first row…

Q: What type of association would you expect in each of the cases below (positive, negative, or none)?…

A: To determine relationship in the given statements.

Q: If the Syracuse men's basketball team won 18 games and lost 10, and the Syracuse women's basketball…

A:

Q: The Beck Depression Inventory Test used 500 people in their norm group, which I don't think is…

A: Given:- The Beck Depression Inventory Test used 500 people in their norm group, which I don't think…

Q: Nationally, 83% of Americans have earned a high school diploma.  We want to see if the proportion of…

A: We have to find sample proportion.

Q: You wish to take a random sample of 45 students from a population of 120 men and 100  women for the…

A:

Q: Hurricane damage: In August and September 2005, Hurricanes Katrina and Rita caused extraordinary…

A: Given : x1= 58.0 n1= 370 x2= 30.0 n2= 173 significance level, 0.01

Q: When we are comparing two sample means that are not the same group of individuals, what kind of test…

A: Given that  When we are comparing two sample means that are not the same group of individuals

Q: Imagine a researcher asks a sample of five people to drive two types of cars and rate each of them…

A:

Q: If you wanted information about a population, it could be impossible to ask everyone. One way to…

A: In any research or in a survey, a population of interest is considered. While it is not possible to…

Q: What percentage of scores fall between the following z scores: -1 to +1; -1 to +2; and -1 to +3?

A: a) -1 to +1 = P(-1<z<1) = P(Z<1)-P(Z<-1)  =0.8413-0.1587 =0.6826 =68.26%

Q: The Ministry of Health in the Canadian Province of Ontario conducted the Ontario Health Survey by…

A: Stratified sampling :- When we have Homogenous distinguishable sub-groups. Then the population is…

Q: among the 1018 respondents, 428 said that pesticides are "not at all harmful."  What percentage of…

A: Total number of respondents = 1018Total number of respondents said that pesticides are "not at all…

Q: In how many ways can a statistician select a sample of 15 people from a population of 90 people?

A: Given,A statistician select a sample of 15 people from a population of 90 people.

Q: Residents in a city are charged for water usage every three months. The water bill is computed from…

A: INTRODUCTION :   HISTOGRAM: The Histogram is often useful to represent a frequency distribution…

Q: The number of books checked out from the library from 25 students are as follows: 0; 0; 0; 2; 2; 3;…

A: Consider the data 0,0,0,2,2,3,3,4,4,5,5,6,7,7,8,8,8,8,10,10,11,11,12,12

Q: You asked each participant to indicate their sex (SEX [1=male, 2=female]) and age (AGE). You gave…

A: Given table is :-  Here Sex 1 indicates male . So,     Total number of male perticipants ,n…

Q: For an article in a magazine, 20 different vehicles were selected to obtain data for comparison.…

A: The data is collected from 20 vehicles regarding the price, the fuel economy, the number of doors,…

Q: If you are using open-ended information, which you might obtain from surveys, focus groups,…

A: Surveys are used to collect data from the research to understand the behavior of the people from a…

Q: Use the following for the next two questions: The Hershey Company wants to know if it is doing…

A: The 95% confidence interval is  millions of dollars.

Q: How many degrees of freedom does your sample contain?

A: Given that  Sample size=n=30 Formula for degree of freedom  df=n-1

Q: b. TripAdvisor is one of many online websites that provides ratings for hotels throughout the world.…

A:

Q: You are an education researcher interested in studying if race or ethnicity affects the severity of…

A: You are an education researcher interested in studying if race or ethnicity affects the severity of…

Q: For this discussion, you will come up with an example of a situation in which two means would need…

A: Describe a possible study that could be conducted to compare two groups means:

Q: What is the best way to answer each of the questions below: a survey, an experiment, or an…

A: In survey we collect data from from predefined group for a specific purpose. In our example the…

Q: expensive). The toy was priced the same at all retail stores. Compute the percentage of variance…

A:

Q: You want to compare the average working time of customer service from two companies. 9…

A: Two proportion z test used for camaring two proportion Two sample t test used to. campare the…

Q: The Student Union President conducted a survey to estimate the proportion of first year students who…

A: Undercoverage bias is a type of sampling bias that occurs when some parts of a research population…

Q: In a study conducted by a human resource management​ organization, 492 human resource professionals…

A: We have given that In a study conducted by a human resource management​ organization, 492 human…

Q: Determine what is the appropriate statistical procedure, with a brief explanation (one sentence) as…

A: As per our guidelines, we are allowed to answer three sub-parts Given Data :   Current week (X1)…

Q: 3) The Tire Rack, an online distributor of tires and wheels, conducts extensive testing to provide…

A: The level of significance is α=0.01. Given data: Tread Wear Dry Traction Steering Buy Again 8.6…

Q: Create a 95% confidence interval for the true proportion of adult North Americans that have…

A: We have given thatn=3532x=1219Confidence level (c) = 95% =0.95

Q: In a survey the maximum data point was 100 while the minimum data  point was 10. if the number of…

A:

Q: Raymond wants to estimate the percentage of parents that use cloth diapers. He asks a randomly…

A: According to the provided information, Raymond wants to estimate the percentage of parents that use…

Q: A newspaper infographic titled "Social Media Jeopardizing Your Job?" summarized data from a survey…

A: Number of recruiters 54% of people had reconsidered a job candidate based on their social media…

Q: Using the test results provided, test the hypothesis that soil treatment affects the number of…

A: The level of significance is 0.05.

Q: Suppose we wish to compare the health status of two groups of people. What variables might we use to…

A: Given information: The investigator is specially interested to compare the health status of two…

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.