A researcher in the field of educational psychology is interested in the effects an open classroom has on intellectual development. In the open classroom things are much less structured than in a traditional classroom and she believes that this might affect problem-solving skills. An elementary school in her district switched to an open classroom format last year, and she is interested to see how this has impacted on the kids problem-solving skills. She obtains a random sample of 49 fourth grade children and administers a conceptual problem-solving test to them. It is known that fourth graders in traditional classes have an average score of 82 on the test. The children in this study score an average of 86 with a standard deviation of 5. Use this information to answer the following five questions. If the critical value for this example was 2.423, what would you conclude about the study?   Select one: a. Retain the null hypothesis and claim that open classrooms affect problem-solving skills.  b. There wasn't enough statistical power for you to find an effect.  c. Reject the null hypothesis and claim that open classrooms affect problem-solving skills.

Q: The Consumer Reports Restaurant Customer Satisfaction Survey is based upon 146,099 visits to…

A:

Q: For a team project, students asked peers if they thought of their parents or guardians as "strict".…

A: Given : They do not have time to interview all 1000 students.  Here they will select the sample from…

Q: In a survey of working parents (both parents working), one of the questions asked was "Have you…

A:

Q: Seattle Grace Medical Center. As part of a long-term study of individuals 65 years of age or older,…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: In a study examining the effect of humor on interpersonal attractions, McGee and Shevlin (2009)…

A:

Q: In a survey of families in which both parents work, one of the questions asked was, "Have you…

A: Given , Sample sizes : n1 =n2 = 200 Sample proportions : p^1 = 0.26  , p^2 = 0.23 Claim : There is a…

Q: Required: The managers in the region are interested in opening a new store with expected revenues of…

A: Here the dependent variable (y) is store cost.The independent variable (x) is revenues.Given…

Q: Swearing is a common, almost reflexive, response to pain. Whether you knock your shin into the edge…

A: The given data set is. Neutral word (x1) Swearing (x2) d=(x2)- (x1) 9 7 -2 9 8…

Q: You are a senior in the agricultural sciences department of NCSU doing an internship at a local…

A:

Q: Treat the data as if the scores are from an independent-measures study using two separate samples,…

A: As per our guidelines, we are allowed to answer three sub-parts per query. Here in this question…

Q: ou are doing research with people who are homeless. You want to be able to identify those who are…

A:

Q: You think that there might be a relationship between income and what type of outdoor activities…

A:

Q: Calculate the mean and standard deviation of the depression scores for those in good health for each…

A: Given,the scores of depression for healthy elders, and those with chronic disease in each of the…

Q: What type of design did they use?

A:

Q: Italian Seafood Steakhouse $12 $16 $24 13 18 19 15 17 23 17 26 25 18 23 21 20 15…

A:

Q: Treatment for depression: Researchers conducted a study of 18 patients whose depression had not…

A: Given that: Sample size, n=18

Q: Computer-mediated communication (CMC) is a form of interaction that heavily involves technology…

A:

Q: Professor Wonka is interested in whether candy influences children's mood. One group of children is…

A: The formula for effect size is obtained as given below: Effect…

Q: A researcher is interested in the impact of joining a weight loss program in the past 12 months on…

A: Given information: The information about the questionnaire is given. The investigator is specially…

Q: A researcher conducts an independent-measures study examining how the brain chemical serotonin is…

A: A. Null and alternate hypotheses: The investigator is specifically interested to test whether the…

Q: In studies examining the effect of humor on interpersonal attractions, McGee and Shevlin (2009)…

A: Given information- For the females who read the “great sense of humor” description gave. Population…

Q: Swearing is a common, almost reflexive, response to pain. Whether you knock your shin into the edge…

A: The data regarding swearing and neutral world is given below Consider neutral world be denoted as…

Q: Individuals with strong religious beliefs often turn to their faith to cope with stressful life…

A: Solution: The given table of data is

Q: Computer-mediated communication (CMC) is a form of interaction that heavily involves technology…

A: Given: The data given is:                                                                     CMC…

Q: In a survey of working parents (both parents working), one of the questions asked was "Have you…

A: From the provided information,

Q: ted to explore the prevalence and impact of sleep problems on various aspects of people's lives.…

A: 1)  To test this claim we will use the one-sample t test for mean, as the sample size is really…

Q: A criminal psychologist is interested in whether individuals in high power corporate positions are…

A: a) The null and alternate hypothesis is H0 : μ1=μ2=μ3 HA : Not all the population means are equal b)…

Q: A new study by Brent Teasdal and Eric Silver (Social Problems, February 2009) argues the…

A: The  independent and dependent variables in terms of cause and effect: An independent variable is…

Q: c) X=TVs per capita, Y = life expectancy, Sample = {27 developed and developing countries}. Finding:…

A: I’m answering c)

Q: "Bullying," according to noted expert Dan Olweus, "poisons the educational environment and affects…

A: Given, The hypothesis to be tested is given as: This is a two-tailed test. The degrees of freedom…

Q: stimulus person giving a speech. All stimulus persons gave the same verbal speech. After observing…

A: Solution

Q: A psychologist develops an intervention designed to reduce test anxiety associated with taking the…

A: We have given that the psychologist claims that reduced test anxiety will lead to higher scores on…

Q: The Consumer Reports Restaurant Customer Satisfaction Survey is based upon 148,599 visits to…

A: From given data we have :   Group 1 Group 2 Group 3   14 16 22   15 18 17   13 18 21   15…

Q: A researcher is interested in exploring the relationship between calcium intake and weight loss. Two…

A: Given A researcher is interested in exploring the relationship between calcium intake and weight…

Q: A local teacher wants to see if teaching writing in different ways impacts student learning. She has…

A: Concept: According to the information given we will use Two sample independent T test for hypothesis…

Q: Treat the data as if the scores are from an independent-measures study using two separate samples,…

A: Provided data is: Participants Neutral word Swearing A 9 7 B 9 8 C 9…

Q: Childhood vaccinations: In January 2015, the Pew Research Center reported results from one of their…

A: It is given that 68% of adults say such vaccines should be required.

Q: Motivational speakers want to be perceived as trustworthy. One hypothesis is that speakers who…

A: 1. The experiment is designed to test the effect of training on headache. Thus, the independent…

Q: A study was conducted to explore the prevalence and impact of sleep problems on various aspects of…

A: Hypothesis testing : Hypothesis testing is a type of statistical inference that uses sample data to…

Q: Short answer. You are conducting a study on an effective therapy for borderline personality…

A: Descriptive Statistics: It is the statistical measure used to describe the data with the measure of…

Q: In the early 1970s, a young man challenged an Oklahoma state law that prohibited the sale of 3.2%…

A:

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.