13.44 Interactions in a children's museum. Refer to the EarlyChildhood Education Journal (Mar. 2014) study of inter-INTERACT actions in a children's museum, Exercise 13.19 (p. 781).Summary information for the 170 meaningful interactionssampled is reproduced in the following table. Do the pro-portions associated with the different types of interac-tions depend on whether the interaction was child-led oradult-led? Test, using a .01. Yes, x2 = 55.4Type of InteractionShow-and-tellRefocusingLearning/TeachingParticipatory PlayAdvocating/DiscipliningTotalsChild-Led Adult-Led26021642110129168189

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Answered: 13.44 Interactions in a children's…

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015

1st Edition

ISBN:9781680331141

Author:HOUGHTON MIFFLIN HARCOURT

Publisher:HOUGHTON MIFFLIN HARCOURT

Chapter4: Writing Linear Equations

Section: Chapter Questions

Problem 14CR

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A study investigating the effect of student gender on poor academic performance (measured as having a grade of B or lower) at the University of Colorado reported that 17% of male students had poor performance and that 11% of female students had poor performance. Given this information, can we determine if there is an association between sex and academic performance? (Choose the one best answer). Group of answer choices Yes, female students have a lower rate of poor academic performance therefore poor academic performance is associated with being a female student. No, male students only have a slightly higher prevalence of poor academic performance compared to female students and therefore there is no association between poor performance and gender. Yes, male students have a higher rate of poor academic performance therefore poor academic performance is associated with being a male student. No, the prevalence values alone cannot be used to assess an association between…
McAllister et al. (2012) compared varsity football and hockey players with varsity athletes from noncontact sports to determine whether exposure to head impacts during one season have an effect on cognitive performance. In the study, tests of new learning performance were significantly poorer for the contact sport athletes compared to the noncontact sport athletes. The following table presents data similar to the results obtained in the study. Noncontact Athletes: 10, 8, 7, 9, 13, 7, 6, 12 Contact Athletes: 7, 4, 9, 3, 7, 6, 10, 2 a. Are the test scores significantly lower for the contact sport athletes than for the noncontact athletes? Use a one-tailed test with =.05 t-critical= t= b. Compute the value of (percentage of variance accounted for) for these data. r^2= a. 0.123, b. 0.239, c. 0.138, d. 0.264
McAllister et al. (2012) compared varsity football and hockey players with varsity athletes from noncontact sports to determine whether exposure to head impacts during one season have an effect on cognitive performance. In the study, tests of new learning performance were significantly poorer for the contact sport athletes compared to the noncontact sport athletes. The following table presents data similar to the results obtained in the study. Noncontact Athletes: 10, 8, 7, 9, 13, 7, 6, 12 Contact Athletes: 7, 4, 9, 3, 7, 6, 10, 2 a. Are the test scores significantly lower for the contact sport athletes than for the noncontact athletes? Use a two-tailed test with =.05 b. What sampling technique was most likely employed by the researcher? justify your answer c. Does exposure to head impacts have an effect on cognitive performance? why or why not
6.36 Diabetes and unemployment: A 2012 Gallup poll surveyed Americans about their employment status and whether or not they have diabetes. The survey results indicate that 1.5% of the 47,774 employed (full or part time) and 2.5% of the 5,855 unemployed 18-29 year olds have diabetes.(a) Create a two-way table presenting the results of this study. Diabetes No Diabetes Employed Unemployed
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A sociologist wants to investigate the question, "Is there a relationship between texting during class and grade-point-average (GPA) among high school seniors in a large district?" Which study design is most appropriate? Before the semester starts, randomly select 40 seniors from each high school who do not text during class. Assign 20 to the texting treatment group (text three or more times during every class meeting) and 20 to the control group (no texting during class). At the end of the semester, obtain each student’s GPA from the appropriate admissions and records office. Compare the GPA of students who routinely text during class to the GPA of students who do not text during class. Before the semester starts, randomly select 40 seniors from each high school who do not text during class. Assign 20 to the texting treatment group (text three or more times during every class meeting) and 20 to the control group (no texting during class). At the end of the semester,…
The paper "Deception and Design: The Impact of Communication Technology on Lying Behavior"+ describes an investigation into whether lying is less common in face-to-face communication than in other forms of communication such as phone conversations or e-mail. Participants in this study were 30 students in an upper-division communications course at Cornell University who received course credit for participation. Participants were asked to record all of their social interactions for a week, making note of any lies told. Based on data from these records, the authors of the paper concluded that students lie more often in phone conversations than in face-to-face conversations and more often in face-to-face conversations than in e-mail. Discuss the limitations of this study, commenting on the way the sample was selected and potential sources of bias. (Select all that apply.) O Students knew that they were surveying themselves as to the truthfulness of their interactions, which could have…
The Health Behaviour in School-Aged Children (HSBC) network collects data on various behaviors of preteen and teenage children. In 2006, the HSBC network surveyed a randomly selected sample of 638 preteen and teenage boys in Greenland to determine what proportion of students were bullied at least twice per month in the previous few months. In the sample, 147 students were bullied at least twice per month, and 491 students were bullied less than twice per month. The HSBC network wants to construct a 95% confidence interval for p, the proportion of preteen and teenage boys who are bullied at least twice per month in Greenland. Have the requirements for a large-sample z-confidence interval been met? Mark all of the following requirements that have been met with yes, and the requirements that have not been met with no. O O The sample is a simple random sample. The parameter of interest is categorical with two possible outcomes, which are considered success and failure. When the sample…
Let population 1 be drivers of age 25-34 and let population 2 be drivers of age 50-59. An insurance company collects data on seat-belt use among drivers in a country. Of 1900 drivers 25-34 years old, 19% said that they buckle up, whereas 487 of 1800 drivers 50-59 years old said that they did. At the 10% significance level, do the data suggest that there is a difference in seat-belt use between drivers 25-34 years old and those Use the two-proportions z-test to conduct the required hypothesis test. What are the hypotheses for this test? A.Upper H 0 : p 1 equals p 2 comma Upper H Subscript a Baseline : p 1 greater than p 2 H0: p1=p2, Ha: p1>p2 B.Upper H 0 : p 1 not equals p 2 comma Upper H Subscript a Baseline : p 1 equals p 2 H0: p1≠p2, Ha: p1=p2 C.Upper H 0 : p 1 equals p 2 comma Upper H Subscript a Baseline : p 1 not equals p 2 H0: p1=p2, Ha: p1≠p2 Your answer is correct. D.Upper H 0 : p 1 equals p 2 comma Upper H Subscript a Baseline : p 1…
A study collected arm bone strength information for two groups of young men. The first group in the study was a control group of 15 men who are not baseball players. The second group in the study comprised men who played baseball. We know that these baseball players use their dominant arm in throwing (those who throw with their nondominant arm were excluded), so they get more arm exercise than the controls. Here are the data for the baseball players. ID Nondominant Dominant ID Nondominant Dominant 16 17.0 19.3 24 15.1 19.5 17 16.9 19.0 25 13.4 20.5 18 17.8 25.1 26 13.6 17.1 19 21.1 37.6 27 20.3 26.5 20 21.0 40.4 28 17.2 30.2 21 14.7 20.8 29 14.7 17.4 22 31.4 36.8 30 22.7 35.0 23 14.8 21.3 Here is the equation of the least-squares line for the baseball players. dominant = 0.996 + (1.368 ✕ nondominant) A young male who is a baseball player has a bone strength of 18.0 cm4/1000 in his nondominant arm. Predict the bone strength in the dominant arm for this…
3. Does stress affect the recall ability of police witnesses? This issue was studied in an experiment that tested eyewitness memory a week after a nonstressful interrogation of a cooperative suspect and a stressful interrogation [the way of questioning] of an uncooperative suspect. The numbers of details recalled a week after the incident are summarized in the margin (based on data from "Eyewitness Memory of Police Trainees for Realistic Role Plays," by Yuille et al., Journal of Applied Psychology, Vol. 79, No. 6). Use 0.01 level of significance to test the claim in the article that stress decreased the amount recalled. Assume equal population variances. Nonstress Stress n1 = 40 X1 = 53.3 S1 = 11.6 n2 = 40 X2 = 45.3 S2 = 13.2 a. Claim (in symbolic form): Но: На: b. level of significance: test-statistic: tail of distribution:_ c. Decision Rule: Reject Ho if d. Computation e. Decision (Reject Ho or Failed to reject Ho) f. Conclusion
3. Does stress affect the recall ability of police witnesses? This issue was studied in an experiment that tested eyewitness memory a week after a nonstressful interrogation of a cooperative suspect and a stressful interrogation (the way of questioning] of an uncooperative suspect. The numbers of details recalled a week after the incident are summarized in the margin (based on data from "Eyewitness Memory of Police Trainees for Realistic Role Plays," by Yuille et al., Journal of Applied Psychology, Vol. 79, No. 6). Use 0.01 level of significance to test the claim in the article that stress decreased the amount recalled. Assume equal population variances. Nonstress Stress N1 = 40 X, = 53.3 n2 = 40 X2 = 45.3 S2 = 13.2 S1 = 11.6 a. Claim (in symbolic form): Но: На: b. level of significance: test-statistic: tail of distribution: c. Decision Rule: Reject Ho if d. Computation e. Decision (Reject Ho or Failed to reject Ho) f. Conclusion

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