New Semester
Started
Get
50% OFF
Study Help!
--h --m --s
Claim Now
Question Answers
Textbooks
Find textbooks, questions and answers
Oops, something went wrong!
Change your search query and then try again
S
Books
FREE
Study Help
Expert Questions
Accounting
General Management
Mathematics
Finance
Organizational Behaviour
Law
Physics
Operating System
Management Leadership
Sociology
Programming
Marketing
Database
Computer Network
Economics
Textbooks Solutions
Accounting
Managerial Accounting
Management Leadership
Cost Accounting
Statistics
Business Law
Corporate Finance
Finance
Economics
Auditing
Tutors
Online Tutors
Find a Tutor
Hire a Tutor
Become a Tutor
AI Tutor
AI Study Planner
NEW
Sell Books
Search
Search
Sign In
Register
study help
mathematics
statistics
Statistics For The Behavioral Sciences 9th Edition Frederick J Gravetter, Larry B. Wallnau - Solutions
To investigate the phenomenon of "home-team advantage," a researcher recorded the outcomes from 64 college football games on one Saturday in October. Of the 64 games, 42 were won by home teams. Does this result provide enough evidence to conclude that home teams win significantly more than would be
Research has demonstrated that people tend to be attracted to others who are similar to themselves. One study demonstrated that individuals are disproportionately more likely to marry those with surnames that begin with the same last letter as their own (Jones, Pelham, Carvallo, & Mirenberg,
Suppose that the researcher from the previous problem repeated the study of married couples' initials using twice as many participants and obtaining observed frequencies that exactly double the original values. The resulting data are as follows:a. Use a chi-square test to determine whether the
A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years. It is known that the overall grade distribution for the department in 1985 had 14% As, 26% Bs, 31% Cs, 19% Ds, and 10% Fs. A sample of n = 200 psychology
Automobile insurance is much more expensive for teenage drivers than for older drivers. To justify this cost difference, insurance companies claim that the younger drivers are much more likely to be involved in costly accidents. To test this claim, a researcher obtains information about registered
To investigate the phenomenon of "home team advantage," a researcher recorded the outcomes from 64 college football games on one Saturday in October. Of the 64 games, 42 were won by home teams. Does this result provide enough evidence to conclude that home teams win significantly more than would be
In 2005, Fung et al. published a study reporting that patients prefer technical quality versus interpersonal skills when selecting a primary care physician. Participants were presented with report cards describing pairs of hypothetical physicians and were asked to select the one that they
Danner and Phillips (2008) report the results from a county-wide study showing that delaying high school start times by one hour significantly reduced the motor vehicle crash rate for teen drivers in the study. Suppose that the researchers monitored 500 student drivers for 1 year after the start
For each of the following, assume that a two-tailed test using the normal approximation to the binomial distribution with α = .05 is being used to evaluate the significance of the result.a. For a true-false test with 20 questions, how many would you have to get right to do significantly better
On a multiple-choice exam with 100 questions and 4 possible answers for each question, you get a score of X = 32. Is your score significantly better than would be expected by chance (by simply guessing for each question)? Use a two tailed test with α = .05.
For each of the following, assume that a two-tailed test using the normal approximation to the binomial distribution with α = .05 is being used to evaluate the significance of the result.a. For a multiple-choice test with 48 questions, each with 4 possible answers, how many would you have to get
Reed, Vernon, and Johnson (2004) examined the relationship between brain nerve conduction velocity and intelligence in normal adults. Brain nerve conduction velocity was measured three separate ways and nine different measures were used for intelligence. The researchers then correlated each of the
In the Preview section for Chapter 11, we presented a study showing that swearing can help relieve pain (Stephens, Atkins, & Kingston, 2009). In the study, participants placed one hand in freezing cold water for as long as they could bear the pain. In one condition, they shouted a swear word
Thirty percent of the students in the local elementary school are classified as only children (no siblings). However, in the special program for talented and gifted children, 43 out of 90 students are only children. Is the proportion of only children in the special program significantly different
Stressful or traumatic experiences can often worsen other health-related problems such as asthma or rheumatoid arthritis. However, if patients are instructed to write about their stressful experiences, it can often lead to improvement in health (Smyth, Stone, Hurewitz, & Kaell, 1999). In a
Langewitz, Izakovic, and Wyler (2005) reported that self-hypnosis can significantly reduce hay-fever symptoms. Patients with moderate to severe allergic reactions were trained to focus their minds on specific locations where their allergies did not bother them, such as a beach or a ski resort. In a
Insurance companies charge young drivers more for automobile insurance because they tend to have more accidents than older drivers. To make this point, an insurance representative first determines that only 16% of licensed drivers are age 20 or younger. Because this age group makes up only 16% of
Group-housed laying hens appear to prefer having more floor space than height in their cages. Albentosa and Cooper (2005) tested hens in groups of 10. The birds in each group were given free choice between a cage with a height of 38 cm (low) and a cage with a height of 45 cm (high). The results
In Problem 21 in Chapter 11, we described a study showing that students are likely to improve their test scores if they go back and change answers after reconsidering some of the questions on the exam (Johnston, 1975). In the study, one group of students was encouraged to reconsider each question
The habituation technique is one method that is used to examine memory for infants. The procedure involves presenting a stimulus to an infant (usually projected on the ceiling above the crib) for a fixed time period and recording how long the infant spends looking at the stimulus. After a brief
Most children and adults are able to learn the meaning of new words by listening to sentences in which the words appear. Shulman and Guberman (2007) tested the ability of children to learn word meaning from syntactical cues for three groups: children with autism, children with specific language
A researcher is testing the effectiveness of a skills mastery imagery program for soccer players. A sample of n = 25 college varsity players is selected and each player is tested on a ball-handling obstacle course before beginning the imagery program and again after completing the 5-week program.
Last year the college counseling center offered a workshop for students who claimed to suffer from extreme exam anxiety. Of the 45 students who attended the workshop, 31 had higher grade-point averages this semester than they did last year. Do these data indicate a significant difference from what
Trying to fight a drug-resistant bacteria, a researcher tries an experimental drug on infected subjects. Out of 70 monkeys, 42 showed improvement, 22 got worse, and 6 showed no change. Is this researcher working in the right direction? Is there a significant effect of the drug on the infection? Use
Biofeedback training is often used to help people who suffer migraine headaches. A recent study found that 29 out of 50 participants reported a decrease in the frequency and severity of their headaches after receiving biofeedback training. Of the remaining participants in this study, 10 reported
Güven, Elaimis, Binokay, and Tan (2003) studied the distribution of paw preferences in rats using a computerized food-reaching test. For a sample of n = 144 rats, they found 104 right-handed animals. Is this significantly more than would be expected if right- and left-handed rats are equally
During the 2004 Olympic Games, Hill and Barton (2005) monitored contests in four combat sports: Greco-Roman wrestling, freestyle wrestling, boxing, and tae kwon do. Half of the competitors were assigned red outfits and half were assigned blue. The results indicate that participants wearing red won
Problem 6 in Chapter 17 cited a study showing that people tend to choose partners who are similar to themselves. Jones, Pelham, Carvallo, & Mirenberg, 650 CHAPTER 18 (2004) demonstrated that people have a tendency to select marriage partners with surnames that begin with the same last letter as
A researcher would like to determine whether people really can tell the difference between bottled water and tap water. Participants are asked to taste two unlabeled glasses of water, one bottled and one tap, and identify the one they thought tasted better. Out of 40 people in the sample, 28 picked
In 1985, only 8% of the students in the city school district were classified as being learning disabled. A school psychologist suspects that the proportion of learning-disabled children has changed dramatically over the years. To demonstrate this point, a random sample of n = 300 students is
In the Preview section for Chapter 17, we discussed a study by Loftus and Palmer (1974) examining how different phrasing of questions can influence eyewitness testimony. In the study, students watched a video of an automobile accident and then were questioned about what they had seen. One group of
A recent survey of practicing psychotherapists revealed that 25% of the individuals responding agreed with the statement, "Hypnosis can be used to recover accurate memories of past lives" (Yapko, 1994). A researcher would like to determine whether this same level of belief exists in the general
The following scores are related by the equation Y = X2. Note that this is not a linear relationship, but every time X increases, Y also increases.a. Compute the Pearson correlation between X and Y. You should find a positive, but not perfect, correlation. b. Convert the scores to ranks and compute
It is well known that similarity in attitudes, beliefs, and interests plays an important role in interpersonal attraction (see Byrne, 1971, for example). Thus, correlations for attitudes between married couples should be strong. Suppose that a researcher developed a questionnaire that measures how
A researcher is investigating the physical characteristics that influence whether a person's face is judged as beautiful. The researcher selects a photograph of a woman and then creates two modifications of the photo by (1) moving the eyes slightly farther apart and (2) moving the eyes slightly
Friedman and Rosenman (1974) have suggested that personality type is related to heart disease. Specifically, type A people, who are competitive, driven, pressured, and impatient, are more prone to heart disease. On the other hand, type B individuals, who are less competitive and more relaxed, are
One of the original methods for testing ESP (extrasensory perception) used Zener cards, which were designed specifically for the testing process. Each card shows one of five symbols (square, circle, star, wavy lines, cross). The person being tested must predict the symbol before the card is turned
Research suggests that the antioxidants in foods such as blueberries can reduce and even reverse age-related declines in cognitive functioning (Joseph et al., 1999). To test this phenomenon, a researcher selects a sample of n = 25 adults aged 70 to 75 and administers a cognitive function test to
A researcher is investigating the relationship between personality and birth order position. A sample of college students is classified into four birth-order categories (1st, 2nd, 3rd, 4th or later) and classified as being either extroverted or introverted.
A researcher is investigating the relationship between personality and birth order position. A sample of college students is classified into four birth-order categories (1st, 2nd, 3rd, 4th or later) and given a personality test that measures the degree of extroversion on a 50-point scale.
A survey of female high school seniors includes one question asking for the amount of time spent on clothes, hair, and makeup each morning before school. The researcher plans to use the results as part of a general description of today's high school students.
Brunt, Rhee, and Zhong (2008) surveyed 557 undergraduate college students to examine their weight status, health behaviors, and diet. In a similar study, researchers used body mass index (BMI) to classify a group of students into four categories: underweight, healthy weight, overweight, and obese.
A researcher would like to determine whether infants, age 2 to 3 months, show any evidence of color preference. The babies are positioned in front of a screen on which a set of four colored patches is presented. The four colors are red, green, blue, and yellow. The researcher measures the amount of
A researcher administers a survey to graduating seniors, asking them to rate their optimism about the current job market on a 7-point scale. The researcher plans to use the results as part of a description of today's graduating seniors.
Standardized measures seem to indicate that the average level of anxiety has increased gradually over the past 50 years (Twenge, 2000). In the 1950s, the average score on the Child Manifest Anxiety Scale was μ = 15.1. A researcher administers the same test to a sample of n = 50 of today's children
Belsky, Weinraub, Owen, and Kelly (2001) reported on the effects of preschool childcare on the development of young children. One result suggests that children who spend more time away from their mothers are more likely to show behavioral problems in kindergarten. Suppose that a kindergarten
McGee and Shevlin (2009) found that an individual's sense of humor had a significant effect on how attractive the individual was perceived to be by others. In a similar study, female college students were given brief descriptions of three potential romantic partners. One was identified as the
Numerous studies have found that males report higher self-esteem than females, especially for adolescents (Kling, Hyde, Showers, & Buswell, 1999). A recent study found that males scored an average of 8 points higher than females on a standardized questionnaire measuring self-esteem. The researcher
Recent budget cuts forced the city school district to increase class size in the elementary schools. To determine student reaction to the change, the district administered a survey to students asking whether the larger classes were "better, worse, or not different" from the classes the previous
Research has demonstrated that IQ scores have been increasing, generation by generation, for years (Flynn, 1999). A researcher would like to determine whether this trend can be described by a linear equation showing the relationship between age and IQ scores. The same IQ test is given to a sample
A researcher is investigating the effectiveness of acupuncture treatment for chronic back pain. A sample of n = 20 participants is obtained from a pain clinic. Each individual rates the current level of pain and then begins a 6-week program of acupuncture treatment. At the end of the program, the
Research results indicate that physically attractive people are also perceived as being more intelligent (Eagly, Ashmore, Makhijani, & Longo, 1991). As a demonstration of this phenomenon, a researcher obtained a set of n = 25 photographs of male college students. The photographs were shown to a
Research has shown that people are more likely to show dishonest and self-interested behaviors in darkness than in a well-lit environment (Zhong, Bohns, & Gino, 2010). In a related experiment, students were given a quiz and then asked to grade their own papers while the teacher read the correct
There is some evidence suggesting that you are likely to improve your test score if you rethink and change answers on a multiple-choice exam (Johnston, 1975). To examine this phenomenon, a teacher encouraged students to reconsider their answers before turning in exams. Students were asked to record
A researcher is evaluating customer satisfaction with the service and coverage of three phone carriers. Each individual in a sample of n = 25 uses one carrier for 2 weeks, then switches to another for 2 weeks, and finally switches to the third for 2 weeks. Each participant then rates the three
There is some research indicating that college students who use Facebook while studying tend to have lower grades than non-users (Kirschner & Karpinski, 2010). A representative study surveys students to determine the amount of Facebook use during the time they are studying or doing homework. Based
To examine the effect of sleep deprivation on motorskills performance, a sample of n = 10 participants was tested on a motor-skills task after 24 hours of sleep deprivation, tested again after 36 hours, and tested once more after 48 hours. The dependent variable is the number of errors made on the
Ryan and Hemmes (2005) examined how homework assignments are related to learning.The participants were college students enrolled in a class with weekly homework assignments and quizzes. For some weeks, the homework was required and counted toward the student's grade. Other weeks, the homework was
Ford and Torok (2008) found that motivational signs were effective in increasing physical activity on a college campus. In a similar study, researchers first counted the number of students and faculty who used the stairs and the number who used the elevators in a college building during a 30-minute
Last fall, the college introduced a peer-mentor program in which a sample of n = 75 freshmen was each assigned an upperclassman mentor. To evaluate the success of the program, the administration looked at the number of students who returned to the college to begin their second year. The data showed
To examine the relationship between alcohol consumption and birth weight, a researcher selects a sample of n = 20 pregnant rats and mixes alcohol with their food for 2 weeks before the pups are born. One newborn pup is randomly selected from each subject's litter and the average birth weight for
To examine the relationship between texting and driving skill, a researcher uses orange cones to set up a driving circuit in the high school parking lot. A group of students is then tested on the circuit, once while receiving and sending text messages and once without texting. For each student, the
Childhood participation in sports, cultural groups, and youth groups appears to be related to improved self-esteem for adolescents (McGee, Williams, Howden-Chapman, Martin, & Kawachi, 2006). In a representative study, a researcher compares scores on a standardized self-esteem questionnaire for
There is some evidence indicating that people with visible tattoos are viewed more negatively than people without visible tattoos (Resenhoeft, Villa, & Wiseman, 2008). In a similar study, a researcher showed male college students photographs of women and asked the students to rate the
A researcher investigated different combinations of temperature and humidity to examine how heat affects performance. The researcher compared three temperature conditions (70º, 80º, and 90º) with a high humidity and a low humidity condition for each temperature. A separate group of participants
Hallam, Price, and Katsarou (2002) investigated the influence of background noise on classroom performance for children aged 10 to 12. In a similar study, students in one classroom worked on an arithmetic task with calming music in the background. Students in a second classroom heard aggressive,
Showing 82200 - 82300
of 88243
First
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
Last
Step by Step Answers
Get 50% OFF
Claim Now
.png)
.png)
.png)
.png)
.png)
.png)
.png)
.png)
