2. The mathematical Anxiety rating scale (MARS) measures an individual level of mathematical anxiety on a scale from 25 (no anxiety) to 100 (highest anxiety). A group of researcher administered the MARS to 50 students. One of the objectives of the study was to determine if there is a difference between levels of mathematical anxiety experience by male and female computer science students. | Gender Male 34.8 Female 47.2 n 10.6 24 | 12.4 | 26 At level of significance, is there evidence of a difference of the mean mathematical anxiety experienced by male and female computer science students? Solution: Step 1: State the hypotheses.

2. The mathematical Anxiety rating scale (MARS) measures an individual level of mathematical anxiety on a scale from 25 (no anxiety) to 100 (highest anxiety). A group of researcher administered the MARS to 50 students. One of the objectives of the study was to determine if there is a difference between levels of mathematical anxiety experience by male and female computer science students. | Gender Male 34.8 Female 47.2 n 10.6 24 | 12.4 | 26 At level of significance, is there evidence of a difference of the mean mathematical anxiety experienced by male and female computer science students? Solution: Step 1: State the hypotheses.

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Description: 2. The mathematical Anxiety rating scale (MARS) measures an individual level ofmathematical anxiety on a scale from 25 (no anxiety) to 100 (highest anxiety). Agroup of researcher administered the MARS to 50 students. One of the objectives ofthe stud

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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6. A questionnaire measures an index of risk-taking behavior in respondents. Scores are standardized so that 100 represents the population average. The questionnaire is applied to a sample of teenage boys and girls. The data for boys is {72, 73, 86, 95, 95, 95, 96, 97, 99, 125}. The data for girls is {89, 92, 93, 98, 105, 106, 110, 126, 127, 130}. Explore the group differences with side-by-side boxplots. Create the boxplots and then describe how risk taking behavior varies between genders.
Question C, please show work clearly!!
2. In studying the effect of a drug for treating patients with respiratory problems, a researcher obtained a sample of 12 consenting patients, who, after discussion with their doctor, chose a respiratory drug they would receive. Patients' respiratory tests were assessed twice over a two-month period after initiating the treatment. Research question: The researcher wants to know if there is a significant difference between the group in their second test and those that didn't take the drug in their overall mean of 3.35 in average respiratory scores with a standard deviation of .08. Is there a difference between the two means - does the drug work? Carry out 9 steps of hypothesis testing. Respiratory Test 2 3.4 3.4 3.3 3.4 3.3 3.3 3.3 3.2 3.2 3.2 3.2 3.3 Σ-39.5
Six hundred adult Americans were asked by telephone poll, "What do you think constitutes a middle-class income?"The results are in Table 2.71. Also, include left endpoint, but not the right endpoint.Salary ($) Relative Frequency< 20,000 0.0220,000–25,000 0.0925,000–30,000 0.1930,000–40,000 0.2640,000–50,000 0.1850,000–75,000 0.1775,000–99,999 0.02100,000+ 0.01Table 2.71a. What percentage of the survey answered "not sure"?b. What percentage think that middle-class is from $25,000 to $50,000?c. Construct a histogram of the data.i. Should all bars have the same width, based on the data? Why or why not?ii. How should the <20,000 and the 100,000+ intervals be handled? Why?d. Find the 40th and 80th percentilese. Construct a bar graph of the data
22.) A school counselor is interested in testing if students are showing higher levels of anxiety during the pandemic. The counselor only has access to the school students' Mean level of Anxiety from the year before the pandemic (M = 4.5, on a scale from 1-7). The school allows the counselor to conduct a random survey with a sample of 81 of the school's students. From the sample, the counselor estimates a Mean Anxiety level of 5 with a standard deviation of 0.5. What is the Standard Error? 1 0.5 0.056 0.006 ------------------------------- 23.) Calculate and indicate the value of the appropriate test statistic for question number 22. 1.96 6.12 8.93 0.05 ------------------------------------------------ 24.) Given the appropriate test statistic for question 22, what can the school counselor conclude (two-tailed test, alpha = .05)? Reject the null hypothesis, the students' level of anxiety is significantly higher during the pandemic than the…
d) One of the primary end points/outcomes the study listed was the number of days that it took to reach a 50% reduction in symptoms as reported on a 12-Symptom scale. In Table 2, you can see that the statistical test they used to evaluate differences between groups for this end point produced a p-value of 0.97. Please provide an interpretation of this p-value, explaining what it means in terms of whether significant differences exist between the groups in the number of days it took to achieve a 50% reduction in symptoms on the 12-Symptom scale.
Lecture(10.3): Identify the test statistic used for the ANOVA procedure and how it is calculated. (a) The test statistic is F and is the ratio of the variation between groups to the variation within groups. (b) The test staistic is Z and is the ratio of the mean within a group to the variation between groups. (c) The test statistic is Z and is calculated by finding the mean Z score between groups.
Consider a study that surveyed 50 people to rate how much they like their job. Ratings mean 1 for “hate my job”, 2 for “dislike my job”, 3 for “neutral”, 4 for “like my job” and 5 for “love my job”. This survey found that • 8 people hated their job• 14 people disliked their job • 15 people were neutral• 9 people liked their job, and • 4 people loved their job. (1) Write a description of the random variable describing this survey(2) Write a probability distribution describing the probability of the outcomes of this event. (3) What probability of people like their job?(4) Calculate the expected rating.
The mean number of sick days an employee takes per year is believed to be about 10. Members of a personnel department do not believe this figure. They randomly survey &8 employees. The number of sick days they took for the past year are as follows: 12; 6; 15; 3; 10; 8; 8; 8. Let X= the number of sick days they took for the past year. Should the personnel team believe that the mean number is about 10? Conduct a hypothesis test at the 5% level. What is the test statistic? (If using the z distribution round your answers to two decimal places, and if using the t distribution round your answers to three decimal places.) What is the p-value? (Round your answer to four decimal places.) Construct a 95% confidence interval for the true mean. Sketch the graph of the situation. Label the point estimate and the lower and upper bounds of the confidence interval. (Round your answers to three decimal places.)
A researcher is studying the effects of his newly created lens on vision. He samples 9 people with poor vision and measures their visual distance (in feet) with the lens and then without the lens. Did people’s vision with the lens differ from their vision without? Participant # With Lens Without Lens 1 8 14 2 6 17 3 9 12 4 7 11 5 5 12 6 9 18 7 8 13 8 9 7 9 7 13 What kind of analysis will you use? Why? State the null and alternative hypothesis. Check your assumptions. Explain why each of them are or are not met. Sketch a distribution and shade the rejection region(s), including the corresponding critical value(s). Using R, calculate your test statistic and interpret the results of your test. (Don’t forget your 95% confidence interval and screenshots of your work!) What do you conclude about the null hypothesis? Are there significant differences?
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