Study on the impact of social media and study habit on student performance:Please use the dataset provided to answer the followinga) What is the percentage of male (vs.) female in the study?b) What is the average number of hours studied?c) What is the average number of social media accounts?d) What is the relationship between number of hours studied and grade (give direction anddescription)?e) What is the relationship between academic performance and number of active social mediaaccount? Rep-Number12345678910111213141516171819202122232425262728293031323334353637383940414243444546Gnder4748495051121112212122211111232111232211122211222122222221121# of Active SM Average # of Hours SIAverage grade212531325344432153222325553324333345112222122233333112567333742233344666223324345634334567377322222213421123232433322211122332333242232222211111121212321

Rep-NumberGnder# of Active SMAverage # of hoursAverage…

Answered: Study on the impact of social media and…

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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A survey collected data on annual credit card charges in seven different categories of expenditures: transportation, groceries, dining out, household expenses, home furnishings, apparel, and entertainment. Using data from a sample of 42 credit card accounts, assume that each account was used to identify the annual credit card charges for groceries (population 1) and the annual credit card charges for dining out (population 2). Using the difference data, with population 1 - population 2, the sample mean difference was d= $840, and the sample standard deviation was S- $1,127. (a) Formulate the null and alternative hypotheses to test for no difference between the population mean credit card charges for groceries and the population mean credit card charges for dining out. H: Hg = 0 Ho: H # 0 H H= 0 Ho: Ha= 0 Ho: Ha 2 0 H: Ha 0 (b) Calculate the test statistic. (Round your answer to three decimal places.)
3. Column titles in a table should describe which of the following? A) The independent variable B) The dependent variable C) The covariate variable 4. Which graph would be most useful in determining the change in two variables over time? A) A histogram B) A bar chart C) A line chart D) A flow chart D) The grouping variable 5. Which type of statistical information or graph would be most helpful in determining whether the baseline characteristics of a study group are well balanced? A) A bar chart B) Descriptive statics C) A box-whisker plot D) A flow chart True/False 1. True or False? Using a 95% confidence interval to describe an odds ratio allows other researchers to determine if the results were statistically significant because a statistically significant odds ratio confidence interval will not include the number 1. 2. True or False? The r2 value and a least squares regression line can be an excellent way to demonstrate the degree of correlation between two variables, and the type of…
C) Does the data provide evidence of an association between age and opinion of the band? Justify your answer.
a. Call centers today play an important role in managing day-to-day business communications with customers. It's important, therefore, to monitor a comprehensive set of metrics, which can help businesses understand the overall performance of a call center. One key metric for measuring overall call center performance is service level which is defined as the percentage of calls answered by a human agent within a specified number of seconds. The time, in seconds, to answer 10 incoming calls to a financial services call center are given below.: 16 14 16 19 6 15 5 6 9 At the 5% level of significance, does this sample show that on average the calls incoming to this call center are answered within 10 seconds. State the null and the alternative hypotheses. What is your conclusion? 14
O What is the independent variable in the study for a Within-Subject Design? What are the levels of that independent variable? What is the dependent variable?
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A research paper describes a study of the relationship between age and 1-hour swimming performance. Data on age and swim distance for over 10,000 men participating in a national long-distance 1-hour swimming competition are summarized in the accompanying table. Representative Age (Midpoint of Age Group) Average Swim Distance (meters) Age Group 20-29 25 3913.5 30-39 35 3718.8 40-49 45 3579.4 50-59 55 3351.9 60-69 65 3000.1 70-79 75 2639.0 80-89 85 2118.4 (a) Find the equation of the least-squares line with x = representative age and y = average swim distance. (Round your numerical values to three decimal places.) + (b) Compute the seven residuals. (Round your answers to three decimal places.) Representative Age (x) Residual (meters) 25 35 45 55 65 75 85 Use the seven residuals to construct a residual plot. Residual Residual Residual 200 200 200 100 100 100 - 100 -100 - 100
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1. Self-esteem, or a person's sense of their own worth, is a global concept that can be impacted by many elements of a person's life. A researcher would like to measure the association between academic self-efficacy, or a person's belief in their academic ability, and their self-esteem in general. Measures of both variables were gathered from ten participants, displayed in the table below. Academic self-efficacy 60 36 12 6 26 5 4 60 34 10 x=25.30 s²x = 472.19 Sx = 21.73 Self-esteem 15 14 16 11 12 35 18 14 19 24 y = 17.80 s²y = 50.55 Sy=7.11 a. Compute the Pearson correlation. b. Determine is the correlation coefficient is significant or not. c. If you were trying to predict someone's self-esteem from their academic self-efficacy, what would the equation be? d. If someone had a score of 83 for academic self-efficacy, what would be the best estimate of their self-esteem score? e. If someone had a score of 54 for academic self-efficacy, what would be the best estimate of their self-esteem…
3. Recent research suggests that American teenagers spend too much time on extracurricular activities. Mrs. Del Cueto, the principal of the local high school, decides to take a sample of students from her school to find out the number extracurricular activities in which they are involved. Using the data presented below, provide the N, mean, median, and the mode. 0, 0, 0, 0, 0, 1, 1, 2, 2, 2, 3, 3, 4, 4, 4, 4

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