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Mathematics Questions and Answers August 20, 2018

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For two population proportions p and p, you are testing the hypothesis: H: p = p versus H: p > p. Suppose you find sample proportions p = 0.28 and p = 0.36, with a sample size of n = 150 from each population. Tasks: 1. Verify that the assumptions for using the z-test hold here. 2. Calculate the z-statistic for the hypothesis test. 3. Calculate the

Since the discovery of China's Terracotta Army in 1974, archaeologists have studied the 7,000 statues, but they have not yet determined if each statue was based on an actual person. Choose 1 answer: Choose 1 answer: (Choice A) NO CHANGE A NO CHANGE (Choice B) statues, B statues, (Choice C) statues but C statues but (Choice D) statues D statues 6

Paired-samples t-tests were conducted to compare consumption and mood between sessions. The difference in consumption between Session 1 and Session 2 was statistically significant, t(39) = 2.54, p = .015, indicating that participants ate less food in Session 2. The difference in mood was also statistically significant, t(39) = -4.36, p < .001,

Trial consultants conduct research related to jury profiling. They must be able to investigate statistics, build profiles of potential jurors, and report accurate data to a trial team who selects the jurors for a case. In this assessment, you research statistics and investigative report that explains the impact of policies and procedures on those

What is the purpose of k-fold cross validation? (a) To predict how a model will perform on new data (b) To help a modeler choose what model configuration to use

Suppose that for two populations that are approximately normally distributed with means and and standard deviations and , you wish to test the hypothesis: H: = versus H: . Discuss how your testing procedure will differ if you assume that the population variances are: Known and equal Known but unequal Unknown and equal Unknown but unequal

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In PERT, the standard deviation of a task is calculated using which formula? Group of answer choices (P - M) / 6 (P - O) / 4 (P - O) / 6 (M - O) / 4

hersch et al 2016 conducted randomized controlled trial examined effect of web-based stress management intervention on nurses stress. The study included 104 participants that were randomized into intervention and control group. Nurses stress was measured with nursing stress scale, multi item likert scale that provided a total stress score. what

Name: ________________________________________________ PSYC 2002C A researcher was interested in determining whether stress levels significantly vary depending on the day of the week. The researcher randomly selected 10 employees from a company to participate in the 1 week study. Each participant completed a brief 5-point stress survey at the end

True orfalse: Random sampling is always the best choice in qualitative studies if possible

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Do i need full covage insurance replac winshild in state of Yexas

lyler surveyed 50 undergraduate students and found that the students who ate more servings of leafy greens per day also reported getting sick for fewer days during the past month. What is the best conclusion to draw from this study? Eating more greens causes students to get sick less often. Being sick less often makes students want to eat more

Taking into account the purpose of a confidence interval described in Section 10.1, explain what is wrong with the following statement: "Based on the survey data, a 95% confidence interval estimate of the sample proportion is 0.099 to 0.117." A confidence interval is an interval that estimates a sample statistic, not a population parameter. The

One feature about the data that does differ from prior statistics is that we will have two values from each subject in our sample. So, we will need both an X distribution and Y distribution to express two values we measure from the same unit in the population. For example, if I want to examine the relationship between amount of time spent studying

In the context of surveys or questionnaires, what is the difference between closedended and openended questions? Group of answer choices Closedended questions allow respondents to write freely; openended restrict responses. Openended questions are used only in interviews; closedended in surveys. Closedended questions limit responses to given

Approaches to Forecasting Judgmental Non-quantitative analysis of subjective inputs Considers "soft" information such as human factors, experience, gut instinct Quantitative: analyze "hard" data Time series models Extends historical patterns of numerical data Associative models Create equations with explanatory variables to predict the future PLZ

Select the appropriate word or phrase to complete the sentence. The hypothesis states that a parameter is equal to a certain value while the hypothesis states that the parameter differs from this value

Which of the following is a common method used in qualitative research? Question 2Answer A. Statistical analysis B. Surveys with closed-ended questions C. In-depth interviews D. Experimental designs

The marks of 10 students are: 40, 45, 45, 50, 50, 50, 55, 55, 60, 65. Find the mode.

charter Frequency Percent Valid Percent Cumulative Percent Valid 0 1781 95.6 95.6 95.6 1 82 4.4 4.4 100.0 Total 1863 100.0 100.0

Would you consider conducting an analysis using #TRPS and MLTSRV? Select one: a. No, it doesn't make any sense trying to establish a relationship between these two variables b. Yes, a 2-group t-test with MLTSRV as the independent grouping variable and #TRPS as the dependent variable makes sense

you will analyze the proportion of schools that use in-school suspensions (variable susp_in_sch) for non-charter schools and charter schools (variable charter) in Massachusetts (variable state_location)

Fuel oil tanks generally have a life expectancy of 20-25 years

In excel how do I create a formula in cell C15 that counts the number of students

As the p-value of a statstical test gets smaller, there is more evidence to _________ the null hypothesis (reject or fail to reject)

What is the percentage of grade 12 students who ever reported vaping nicotine? Choose an option below 6% 28% 17% 39%

For Qualitative Research: Draft 2 research questions about the equality of education For Quantitative Research: Draft at least 1 research question and add hypotheses where appropriate

A paired-samples t-test was conducted to compare stress levels before and after the mindfulness session. The mean stress level decreased from before (M = 7.6, SD = 1.0) to after (M = 5.8, SD = 1.1). The difference was statistically significant, t(9) = 5.02, p = .001, indicating that stress levels were significantly lower after the mindfulness

The intelligence quotient (IQ) is often used as a measure of cognitive ability. IQ scores are commonly assumed to follow a normal distribution with population mean 100. A researcher wishes to investigate whether there is a di erence in mean IQ between men and women. Two independent random samples are drawn and the following output is obtained:

2. A medium-sized hospital wants to forecast the monthly demand for emergency room visits for the next year. Historical data for the past 5 years shows seasonality (higher demand during flu season), an upward trend (due to population growth), and random fluctuations. Develop a practical forecasting plan for the hospital. In your essay, include: -

you will analyze the proportion of schools that are charter schools (variable charter) for schools in Massachusetts (variable state_location). Before beginning this analysis, confirm that you are using the correct sample. Your sample size should be 1,863. For questions 7-18, you will compare this proportion to a reference proportion. The reference

Correlation is another name for causation. Group of answer choices True False

How concerned should you be about bias in the standard error? Explain why

Cmo han influido las opiniones de los hombres en las mujeres? Siguen vindose disuadidos de expresarse artsticamente. Estn confundidos por sus propios intentos de encontrar la independencia. Se dan cuenta de que los hombres se equivocan al desear ms de la vida. Se vuelven demasiado confiadas y hieren el orgullo de los hombres

if Chi squared if greater than the degrees of freedom, what does this mean

Now assume we observe a sequence D := {x (1), x(2), . . . , x(n)} that is independent and identically distributed (i.i.d.) from the distribution. We assume the number of observations of the values: 1, 2, 3 in D are s1, s2, s3, respectively

In a Guttman Analysis, the final measure used to identify whether the composite variable is unidimensional is called the Coefficient of Reproducability. Group of answer choices True False

When asked about the amount of racial bias that currently exists in the criminal justice system, more than half of the African American lawyers, but only _________percent of the white lawyers, answered "very much." Option A 5 Option B 6.5 Option C 25 Option D 12.5

20 (2 points) Question 20 options: Define the H0 and H1 if the social psychologist wants to show that participants will give HIGHER RATING if they are BEING WATCHED. Note that "non-anonymous group" is the group that gives rating while being watched H0: Rating by the non-anonymous group ___ Rating by the anonymous group H1: Rating by the

charter Frequency Percent Valid Percent Cumulative Percent Valid 0 1781 95.6 95.6 95.6 1 82 4.4 4.4 100.0 Total 1863 100.0 100.0

Random samples were drawn from three independent populations. The accompanying data file shows the results. Use Table 3. Click here for the Excel Data File a. Specify the competing hypotheses to test whether some differences exist between the medians. multiple choice 1 H0: m1 = m2 = m3; HA: Not all population medians are equal. H0: m1 m2 m3; HA:

Quantitative Analysis Assume that you are a consultant engaged in a project to implement a major high-speed overpass extension to the most congested highway, linking rural provinces to a major Asian city of 12 million people. A major feature of this project is to implement an electronic toll collection system for this high-speed segment. The

Which of the following practices best describes the iterative approach to qualitative data analysis? a. Sample size is set and data collection tools are finalized prior stating data collection b. All data are collected before any analysis can begin c. Data collection and analysis occur simultaneously, with each informing the other

charter * susp_in_sch Crosstabulation susp_in_sch Total 0 1 charter 0 Count 833 948 1781 % within charter 46.8% 53.2% 100.0% 1 Count 25 57 82 % within charter 30.5% 69.5% 100.0% Total Count 858 1005 1863 % within charter 46.1% 53.9% 100.0%

The chance of making Type II error is specified by ____ Question 16 options: power effect size alpha beta

Seorang mahasiswa melakukan survei terhadap 30 mahasiswa kos di sekitar kampus. Ia menanyakan terlebih dahulu mengenai jenis makanan favorit mahasiswa, dan hasilnya menunjukkan bahwa nasi goreng adalah makanan yang paling banyak dipilih, diikuti oleh mie instan, ayam geprek, pecel lele, dan beberapa makanan lain. Selain itu, ia juga mencatat waktu

Assess the relationship between the Groceries Index and the Cost of Living Index in the cities you studied. How do these indices help you identify the best and worst cities in the list regarding cost? Summarize how this week's visualization (SCATTER CHART AND TABLE) and probability tools helped you in your analysis. CITY GROCERY INDEX COST OF

Two samples have means which differ by 2.7. Sample 1 has 16 observations with a standard deviation of 4.2 and Sample 2 has 25 observations with a standard deviation of 5.3. Compute the upper limit on a 95% confidence interval on the difference in means with 2 decimal places (i.e. 4.56)

The data is in the package mosaicData. The dataset is called RailTrail. The RailTrail data set from the mosaicData package describes the usage of a rail trail in Western Massachusetts. Use these data to answer the following questions. Create a scatterplot of the number of crossings per day volume against the high temperature that day Separate your

Qualitative data analysis software will not do which of the following? a. allow you to apply codes to sections on your data b. develop your codebook for you c. help you manager your transcripts, field notes and memos

Which of the following scenarios exhibits statistical discrimination? Question 49 options: The hiring manager at a firm will not interview women for an engineering role because this industry is predominantly male. A hospital currently employs females for 80% of its nursing staff. A study comes out showing that brunettes are more likely to work

Para Abraham Maslow, las necesidades que primero son requeridas por un ser humano son: Pregunta 1Respuesta a. Necesidades de pertenencia b. Necesidades fisiolgicas c. Necesidades de estima d. Necesidades de seguridad

Table of urb_rur2 by mrace_eth urb_rur2 mrace_eth Frequency Weighted Frequency Std Err of Wgt Freq Percent Std Err of Percent Row Percent Std Err of Row Percent 0 1 3177 49795 1926 1.0250 0.0396 1.2552 0.0485 2 14641 833345 8638 17.1532 0.1740 21.0071 0.2093 3 6929 288813 4798 5.9448 0.0990 7.2804 0.1211 4 2110 103677 3617 2.1340 0.0743 2.6135

What are challenges that might be faced with interpreting a model and different interpretation methods? references

Which of the following best describes a Likert scale? Question 8Answer A. A scale that measures a specific outcome or behavior B. A scale used to rank data from highest to lowest C. A scale that measures the degree of agreement or disagreement with a statement D. A scale used to categorize qualitative data into themes

How concerned should you be about bias in the standard error? Explain why. (Evaluate)

In particular, be on the lookout for violations of the assumption of independence. Real-world data collection strategies will invariably lead to samples that are not representative of the population, over-representing certain characteristics and under-representing others, introducing confounding variables that bias the results. It's important to

The first store samples 53 customers and finds that 34 are local shoppers. A second store samples 76 customers and finds that 36 are local shoppers. Calculate an upper bound on a 90% confidence interval on the difference in the proportion of shoppers who are local. Define the difference as the proportion from the first store minus the proportion

Miami University's colors are white and red. There has been a recent movement on campus to change the university colors to cream and red. The movement has gained traction and Miami University has asked students, staff, faculty, and alumni to vote on their preferred school colors. In total, 892 people participated in this survey. The following data

____________ sampling involves dividing the population into subgroups before sampling. Group of answer choices Stratified Convenience Snowball Purposive

Which of the following is a common data analysis tool used in qualitative research? Group of answer choices SPSS Nvivo Excel MATLAB

here is some information Chi-Square Goodness of Fit Test Introduction A Chi-square goodness of fit test was conducted to examine whether Patient_Services_Satisfaction was equally distributed across all categories. There were 7 levels in Patient_Services_Satisfaction: extremely dissatisfied, very dissatisfied, disastisfied, nuetral, satisfied, very

In the visual analysis of behavioral data, ________ is examined within a condition in terms of its absolute value (mean, median, or range) on the y-axis scale and the degree of stability or variability. Group of answer choices Variability. Stability. Level. Trend

The following learning activity should be completed in teams. Only one submission per team is required. It is important to show your work. All team members should actively contribute to this activity. Subscriber Growth Forecasting The marketing director of an online streaming platform has been tracking the number of subscribers (in thousands) at

how to find confidence interval in a 2 sample t test assuming the variance is equal

En dcadas pasadas ya exista el termino emprender y se hablaba mucho sobre eso en las Universidades, la familia y los medios. Pregunta 7Seleccione una: a. Falso b. Verdadero

About what percentage of children live with blended families? 8 16 24 32

A fire department is evaluating a new training program to improve firefighters' response times. They compared fire stations in LA, Dallas, and Miami that used the traditional program to fire stations in San Francisco, Houston, and Chicago that implemented the new program. Both groups of stations recorded their firefighters' average response time

La matriz de involucrados dentro de un diagnstico de servicio y atencin al cliente busca: Pregunta 2Respuesta a. Satisfacer las necesidades de informacin sobre problemas de los grupos claves en relacin con el servicio a clientes permanentes. b. Satisfacer las necesidades de informacin sobre grupos clave de la gerencia. c. Determinar los actores

Which of the following is a key advantage of qualitative research? Question 9Answer A. Capability to provide deep, contextual understanding of a phenomenon B. Objectivity in data collection and analysis C. Precision in numerical measurement D. Ability to generalize findings to a larger population

Which of the following is not one of the "3 Es" of qualitative data collection in Mills's Data Collection Techniques? Group of answer choices Experiencing through direct observation Enquiring (asking questions, interviews) Examining (documents, records, etc.) Evaluating statistical significance

TRUE OR FALSE: If two events, A and B, are mutually exclusive, then the value of . Question 9Select one: True False

For Qualitative Research: Draft 2 research questions. For Quantitative Research: Draft at least 1 research question and add hypotheses where appropriate

according to my excel chart my slope is saying y=0.0125x - 0.005 and R^2 = 0.983

2. Formulating hypotheses and determining whether a test is one-or two-tailed To identify the correct Z(critical), it is important to determine whether the hypothesis test is one-tailed or two-tailed. The decision between a one- and two-tailed hypothesis is based on the researcher's expectations about the population from which the sample was

4. Suppose the probability of rain on any given day in August in Dublin is 0.3. What is the probability that it will not rain on a randomly chosen day in August

+------+ --- ----------+ | Year | TotalMovies | +------+ --- ----------+ | 2008 | 1 | | 2010 | 1 | | 2017 | 1 | | 2019 | 2 | | 2020 | 5 | +------+ --- ----------+ +------+----------+ | Year | COUNT(*) | +------+----------+ | 2020 | 5 | | 2019 | 2 | | 2008 | 1 | | 2010 | 1 | | 2017 | 1 | +------+----------+ Output differs. See highlights above.

Manually Construct a Histogram on the given data. a machine operator at a small manufacturer of engine parts. A machine that produces spacers has just been installed in the plant and you have been asked to test the machine by collecting data and create a histogram of a sample of the parts. Note: The actual part thickness is 4.00mm plus the value

Out of the examples below, pick two variables that are measurable and can ask people about. The variables must be continuous. Try to pick two variables that you expect would covary. a. Hours of sleep the night before and amount of fatigue b. Hours of sleep and overall mental well-being c. Exercise level the past week and energy levels d. Quality

An Experiment - to test the hypothesis You have just heard again, in the experimental and survey research sections, that self-reported answers can be quite biased. To remove this bias, you want to gather as much behavioral data as possible. For example, instead of asking customers to rate their satisfaction with service, you want to use the

The Likert scale is an example of a ____________ scale. Group of answer choices Cardinal Scale Ordinal Scale Nominal Scale Ratio Scale

Research question: How does gender influence the fear of asking for help at time 1, while accounting for the impact of math comfortability?Please use the data to answer the following questions:What is the null hypothesis for your question?What research design(s) would align with this question?What dependent variable was used and how is it

Which of the following concepts is most associated with external or "high stakes" assessments? case studies statistics observations interviews Question at position 3 3 Multiple Choice 1 point Question at position 3 According to the Florida Department of Education, the primary purpose of Florida's B.E.S.T. assessment is mainly: as a tool for

What are challenges that might be faced with interpreting a model and different interpretation methods

For two population proportions p and p, you are testing the hypothesis: H: p = p versus H: p > p. Suppose you find sample proportions p = 0.28 and p = 0.36, with a sample size of n = 150 from each population. Tasks: Verify that the assumptions for using the z-test hold here. Calculate the z-statistic for the hypothesis test. Calculate the critical

If you are using exponential smoothing, which of the following is true? Group of answer choices Your smoothing factor helps you balance stability and responsiveness. A large alpha helps you chase trends more aggressively. A small alpha helps you take a wait-and-see approach. All the above

I need help having someone check my lab assignment for my research methods course. Our assignment was to run 3 correlations based on a data set the professor created. We were to run the correlations under the Pearson method. We were to then attach the descriptive statistics chart for each of the 3 correlations and create a simple scatter plot

Calculate the sample size required to construct a 95% confidence interval on the mean value from a population if the sample has a mean of 104.2 and a standard deviation of 6.0. The interval should be no greater than 6.9

Alternatively, the NP instead decides that they want to ensure that they have a representative amount of patients over the age of 65. Suppose that the practice has 40% of their patients over the age of 65, and the NP decides to sample 100 patients. To ensure the percentages are representative, all of the NP's patients are divided into two groups

creat a line chart to depict the revenue time series at the monthly level. what insight on a beverage sales does this chart reveal

For two population proportions p and p, you are testing the hypothesis: H: p = p versus H: p > p. Suppose you find sample proportions p = 0.28 and p = 0.36, with a sample size of n = 150 from each population. Tasks: Verify that the assumptions for using the z-test hold here. Calculate the z-statistic for the hypothesis test. Calculate the critical

charter * susp_in_sch Crosstabulation susp_in_sch Total 0 1 charter 0 Count 833 948 1781 % within charter 46.8% 53.2% 100.0% 1 Count 25 57 82 % within charter 30.5% 69.5% 100.0% Total Count 858 1005 1863 % within charter 46.1% 53.9% 100.0%

Which of the following is NOT a step in the research process? Group of answer choices Data collection Data Analysis Data Interpretation Data Manipulation

__________________ is a form of time series analysis using pre-implementation (historic) data to estimate net impacts by comparing achieved outcomes and the projected outcomes over the same time. Group of answer choices Benchmark statistical comparison Trajectory analysis Implementation analysis Pre and post-tests

In Mrs. Deaver's fifth-grade classroom, many students seem to enjoy using a word-processing program for writing. However, there are only four computers in the room. How could the teacher best make use of the limited classroom computer access? a Prioritize those with limited access; allow students who do not have computers at home to use the

creat a line chart to depict the revenue time series at the annual level what insight on beverage sales does this chart reveal

Given the table T (A, B, C, D) FD: A -> B,C B, C -> A B -> D 51. What are the Candidate Key(s) of T 52. What normal form is T in ? WHY? 53 How to normalize T? show result

charter * susp_in_sch Crosstabulation susp_in_sch Total 0 1 charter 0 Count 833 948 1781 % within charter 46.8% 53.2% 100.0% 1 Count 25 57 82 % within charter 30.5% 69.5% 100.0% Total Count 858 1005 1863 % within charter 46.1% 53.9% 100.0%

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