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Mathematics Questions and Answers September 16, 2018

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Sample 1 represents anxiety scores after taking medication and Sample 2 represents anxiety scores after the Exposure Therapy. Which set of sample statistics would present the clearest picture of a real difference between the two treatments? Group of answer choices M1 = 36, M2 = 40, and both variances = 43. M1 = 36, M2 = 40, and both variances = 6.

Students are voting on the color of T-shirts to wear on their field trip. There are 160 students-65 boys and 95 girls-going on the field trip. A random sample of students is chosen. Surveying the random sample produced a representative sample of the population. Which was most likely true of the representative sample? a. The representative sample

Consider a complex random variable n drawn from the complex circularly symmetric Gaussian distribution with unit variance. Identify the PDF of the magni tude of n, which is given by q = n . Evaluate the probability that the magnitude q exceeds some threshold

For each question select the best answer Multiple Choice 1 point newborn baby is categorized as low-birth-weight if the baby weighs less than 2,500 grams. The distribution of weights for newborn babies is approximately ormal with mean 3,300 g and standard deviation 375 g. Which of the following is closest to the probability that a randomly

the solid generated by rotating the region between the branches of the hyperbola ^2/a^2 - x^2/b^2=1 about the x axis is called a hyperboloid. find the volume for -3

According to studies, which percentage of job applicants lie on application forms and resumes? Multiple choice question. 10 percent 30 percent 50 percent 70 percent 90 percent

1.38 Problem 1.61 Problem 1.78. Here x denote the sample mean of the {xi}, s 2 denote the sample variance of the {xi}, and s the sample standard deviation of the {xi}. Problem 2.4 Problem 2.12 Problem 2.18 Other Problem 1: The weather forecaster says that the probability of rain on Saturday is 25% and that the probability of rain on Sunday is 25%.

9 Write a query to determine the age distribution of customers by category and country for the sale_year 2016. -- For each category and country, calculate the age of the youngest and oldest customers (named youngest_customer -- and oldest_customer respectively), and the average age of customers rounded to one decimal place (named

Learning Project: Contemporary Management Techniques Research Paper AssignmentSuppose the Kalamazoo Brewing Company (KBC) currently sells its microbrews in a seven-state area: Illinois, Indiana, Michigan, Minnesota, Mississippi, Ohio, and Wisconsin. The company's data analytics department has collected data from its distributors in each state.

how to deal with tradeod recall and precision in SPAM SMS prediction?

Describe 3 different ways you could measure age One at each LOM: Interval, ordinal, and nominal Give at least some values to show you " get" the differences

Draw a venn diagrm and use the following to fill in the number of elements in each region n(A)=23, n(B)=15, n(A B)=29, n(A')=9

If a researcher is using code numbers assigned to each participant and the principal investigator is the only one with access to the list matching the code with the participants, the researcher is protecting the participants' ____________ Group of answer choices anonymity confidentiality anonymity and confidentiality anonymity but not

One of the best benefits of collecting scatterplot data is to identify the best time(s) to observe. True False

i need 2 numbers with 12 numbers available, how many combinations are there

Tipo de pregunta que le permiten al entrevistado ampliar la informacin sobre un tema concreto. Pregunta 5Respuesta a. Facilitadoras b. Abiertas c. Cerradas d. Clarificadoras

Seperti sudah didiskusikan sebelumnya, perusahaan menggunakan descriptive analysis untuk memahami : - pola dan trend dari data histori - kinerja bisnis saat ini - kelemahan dan kekuatan bisnis atau proses Ukuran-ukuran yang digunakan dalam descriptive analysis untuk tujuan-tujuan di atas terbagi menjadi beberapa tipe, yaitu : Measure of Location

Internal validity is to as external validity is to O control; random assignment O generalizability; control O causality; generalizability O causality; minimizing differences

Which of the following sleep goals is written as a SMART goal? Group of answer choices I will set a reminder in my watch to get ready for bed at 8:45 so that I get in bed and try to be asleep each night by 9pm and wake up at 6am each morning. My Garmin watch tracks sleep data, which can be downloaded to share. I will get 8 hours of sleep until

Variables that carry information about rank and order. Question 61Select one: a. Normal variable b. Ratio scale c. Ordinal scale d. Interval scale

TERMS ype the letter next to the a. The arithmetic average of a set of numbers. definition in the input box next to the term. Click the ? b. Any subset of a population. con for help. c. A consistent error of the same nature. Bias d. A data scale which has consistent distance between points but Constant does not have a meaningful O. Descriptive

Suppose you randomly sample 30 claims in 2014. You want to know the probability that 15 of them are aged 45 to 54. What probability distribution would you use? What is the probability that any one claimant is in that age group?

An auditor inspects 25 transactions processed by the business office of a company. The auditor selects these transactions at random from the thousands that were processed in the most recent three months. In the past, the auditor has found 10% of transactions at this type of company to have been processed incorrectly (including such errors as wrong

Hannah has a chicken coop with 6 hens. Let X represent the total number of eggs the hens lay on a randomly chosen day. The distribution for X is given in the table. A 2-column table with 7 rows. Column 1 is labeled number of eggs with entries 0, 1, 2, 3, 4, 5, 6. Column 2 is labeled probability with entries 0.02, 0.03, 0.07, 0.12, 0.30, 0.28,

Refer to M1S2-code reference#2, what should be the condition in (3)? Group of answer choices vpop => 1000000000 vpop > 1000000000 vpop between 1 and 1000000000 vpop >= 1000000000\

How to address situations where improving sensitivity significantly increases false positives? how trade-offs between these metrics will be balanced during threshold optimization

A Social Psychologist interested in problem-solving wants to explore the effect of reward incentives on the problem-solving performance of first-year undergraduate students in a maze puzzle task. The Social Psychologist recruits 60 first-year undergraduate students and randomly assigns half to the Reward Incentive group and the other half to the

USE AdventureWorksDW2022; 1.a. Find the total number of customers who are single. Be sure to name each derived field. (2 points) -- 8473

what is it called when Observers change their criteria for coding data mid-study

In a survey, employed adults were asked how likely they thought it was that they would lose their jobs within the next year. The results are presented in the following frequency distribution. Construct a relative frequency distribution. Round the answers to two decimal places. Very likely 442 Fairly likely 494 Not too likely 1963 Not likely 4940

The box plot and histogram show the number of minutes sixth-grade students spent reading the previous night. A box-and-whisker plot. The number line goes from 20 to 80. The whiskers range from 25 to 70, and the box ranges from 40 to 55. A line divides the box at 50. A bar graph titled Minutes spent reading. 4 students spent 25 to 34 minutes; 4

In order to calculate the bin ranges needed to create a Histogram with the Data Analysis Toolpak, you will need to find three different Descriptive Statistics. Which of the following is not one of the statistics needed for calculating bin ranges? Group of answer choices Skewness Range Minimum Maximum

The following is a dataset of workers. The variable "employed" is a binary numeric variable that is equal to 1 if the individual is employed and 0 if the individual is not employed. The variable state indicates whether the individual is located in California ("CA") or Oregon ("OR"). What is the fraction of Californian workers who are employed in

Athletic trainers have developed a new training protocol for elite athletes. A random sample of 28 elite athletes are chosen, and the time it takes them to run a mile is recorded. After training under the new protocol, the mile time is again recorded to determine if the new training protocol is effective. Researchers defined the differences as

Sate the research question and the assumptions for this study: Independent Variable 1 - Number of Hours usually work a week (Continuous (Scale/Metric/Ratio) Independent Variable 2 - Dummy coded wrkracism - Respondent feels discriminated because of race (Categorical Dependent Variable - Respondent income in constant dollars (Continuous

Which application of statistics involves identifying key performance indicators, tracking metrics, and assessing progress towards goals? Question 71Answer a. Market Research b. Predictive Analytics c. Performance Measurement d. Operations Management

hould the pilot take any action to correct for an overloaded aircraft? A. No. Because the probability is high, the aircraft is safe to fly with its current load. B. Yes. Because the probability is high, the pilot should take action by somehow reducing the weight of the aircraft

Briefly explain the purpose of using tables and graphs to represent data. select a table or graph included in the research and insert it into the content of your post. Provide an analysis of the table or graph, explaining both pros and cons of the data presented, as well as design elements. Please provide references and in text citations

Use the following research description and corresponding data set to perform the activities given in A-C. Attach your answers in a Word file, which includes screenshots of your JMP outputs and power analyses in an Appendix. An aviation student researcher examined the relationship between pilots' simple visual reaction times and experience, which

dtermine if the lines are parrallel, perpendicular, or neither. y=2x+5 and y=-1/2x-15

Can a t-stat be negative for the hypothesis test of the population mean of the heights of econometrics students (which will always be positive)? Group of answer choices No. Only if the null hypothesized value is positive. Only if the null hypothesized value if negative. None of the answers is correct

Supplemental Exploration: Least squares regression Predicting height from footprints Can a footprint taken at the scene of a crime help to predict the height of the criminal? In other words, is there an association between height and foot length? To investigate this question, a sample of 20 statistics students measured their height (in inches) and

The Relationship Between Level of Education and Yearly Income Income Less than HS HS Grads Some College College Grads Total <25K sentences

Ask your classmate something about his/her data or histogram that is not clear to you. Share something that you see about your classmate's histogram that your classmate did not mention. Suggests a different representation of your classmate's histogram. Might that representation reveal more or different information? Discuss together.Hello Everyone,

If you set alpha to .01 and are conducting a two-tailed test, what value do you need to look up in the normal curve table to determine the cutoff Z score on the comparison distribution? Group of answer choices .020. .010. .005. .001

Which measure of central tendency and dispersion are most appropriate for the following measure: Level of pain on a ten-point scale (Choose one measure of central tendency and one level of dispersion.) Group of answer choices Mean Median Mode Range Standard Deviation

lengthen paragraph: Each statistical test has specific conditions under which it is most suitable. ANOVA is appropriate when you want to compare means across three or more groups and the data meets certain assumptions: the dependent variable should be continuous, the groups being compared must be independent, and the data should ideally be

A miniature golf business runs two different course (Course 1: Mountain Mania, Course 2: Raging River). Keith, the business manager, wants to check if the mean time (in minutes) for an individual to complete Course 1 is less than the mean time to complete Course 2. He randomly chooses 31 customers from Course 1 and 31 customers from Course 2. Then

To investigate biases against women in personnel decisions, psychologists performed a randomized experiment on 50 male bank supervisors attending a management institute who volunteered for the study. The supervisors were asked to make a decision on whether to promote a hypothetical applicant based on a personnel file. Twenty-six of the supervisors

If r = 0.71, what is the coefficient of determination? Group of answer choices 50% 15% 70% 35%

A state legislator wants to determine whether his voters' performance rating (0 - 100 ) has changed from last year to this year. The following table shows the legislator's performance from the same ten randomly selected voters for last year and this year. Use this data to find the 98% confidence interval for the true difference between the

The Periscope Insurance Company uses its automated telephone system to randomly select inbound callers and invite them to answer questions at the end of the call that relate to their overall satisfaction with the service provided. The customer uses the telephone keypad to enter responses to the survey questions. The type of customer satisfaction

While doing placement test for large number of students the most realistic option would be 1. To keep essay type of questions 2. To keep multiple type of questions 3. To keep objective type of questions 4. To all above statements are correct

The average effort to find and correct a requirements error during review takes 6 person-hours, and requirements-related errors uncovered during testing require an average of 55 person-hours to find and correct. Calculate the effort saved per error. Multiple choice question. 330 person-hours/error 49 person-hours/error 61 person-hours/error 9.17

Select the correct answer. A veterinarian is interested in the average number of pets her clients own. Over the course of a month, she questions each client she meets with and records their responses. The veterinarian calculates the average and draws a conclusion from her data. What kind of statistical study did the veterinarian conduct? A.

FC.62 Mitchell's Mills is a startup looking to break into the preparedness market with a revolutionary new wheat grinder called the WG1. Since Mitchell's is a new company they do not have any historical data for sales of its flagship product, but they estimate they will be able to sell 479 in the month of April. The table below contains actual

The point at which the regression line cuts the vertical axis is ___________ a) always zero b) is always the average score on the independent variable c) sometimes positive, sometimes negative d) irrelevant to making the prediction e) none of the above

Apa saja fungsi utama sistem manajemen berbasis data, dan apa perbedaannya dengan basis data

Qu beneficio proporcionan las tecnologas emergentes y los anlisis de datos en la gestin de la cadena de suministro? Pregunta 4Seleccione una: Mayor opacidad en los procesos de produccin Identificacin de patrones y tendencias en los datos Aumento de la incertidumbre en la planificacin logstica Reduccin de la agilidad en la toma de decisiones

Scatter plots play important role in prediction. Next step can be developing a model. Scatter plots provide information about relationships (linear or non-linear) between variables. The variables in scatter plot ________. Group of answer choices must be ordinal must be numerical can be nominal can be both numerical and categorical

Ch.8of SocialStatistics for aDiverseSociety examinesthe difference in educational attainment between first- and second-generation Hispanic Americans and Asian Americans based on the proportion of each group with a bachelor's degree. We present additional data from the Pew Research Center's 2013 report, measuring the percentage of each group that

In this threaded discussion, you will draw on the data you analyzed in the lab. Initial Response: In your first post, summarize your findings for Part 3 of the lab. Do so by displaying the data points that you used and your calculated results. Reply to Peers: Choose three other students' posts. Using their values, identify which results were

The observed flow rate of customers at a gas station checkout is 12 customers per hour. It is known that the checkout clerk can checkout 18 customers per hour. The current utilization of the clerk is... Group of answer choices 99% 83.3% 66.7% 50%

2. Suppose that you just attempted to use your credit card at the grocery store and the transaction didn't go through. You already know that whenever a credit card is cancelled by the bank, no transactions using that card will go through. What other specific statistical information would you need in order to determine how probable it is that your

In a frequency table for "Less-than" analysis, what does each category represent? Question 39Answer a. The values above the specified threshold b. The values below the specified threshold c. The total number of data points in the sales data d. The values equal to the specified threshold

e advantage here is that the median is not een two numbers, the average of those two numbers becomes the median. -king with Statistics Cassie collected newspapers for a recycling plant at a rate of $2.30 per pound of paper. On consecutive days she turned in the following weights: 12lbs, 13lbs, 8lbs, 22lbs, 8.5lbs, 13lbs, and 19lbs. What was her

Instead of selecting samples individually, groups are randomly selected. Question 36Select one: a. Systematic sampling with a random start b. Multi stage sampling c. Cluster sampling d. Stratified random sampling

Suppose you and a friend are playing a game that involves flipping a fair coin 3 times. Let X = the number of times that the coin shows heads. The probability distribution of X is shown in the table. A 2-column table with 4 rows. Column 1 is labeled number of heads with entries 0, 1, 2, 3. Column 2 is labeled probability with entries 0.125, 0.375,

Read a selection of your colleagues' posts and respond to at least two of your colleagues on two different days by expanding upon their reflections, making connections to your perceptions, and offering additional insights. Statistical Analysis and SIR in Infection Prevention Projects Infection prevention remains a top priority in perioperative and

What are your first impressions of this data set? What does this data appear to tell you?a 8/1/2016 9/1/2016 10/1/2016 11/1/2016 12/1/2016 1/1/2017 2/1/2017 3/1/2017 4/1/2017 5/1/2017 6/1/2017 7/1/2017 7/18/2017 Price 106.099998 113.050003 113.540001 110.519997 115.82 121.349998 136.990005 143.660004 143.649994 152.759995 144.020004 150.080002

Recode Salary to be categorical with categories "Less than $40K", "Between $40K and $70K", "Between $70K and $100K", and "Greater than $100K" (where you can treat the breakpoints however you like). Create a crosstabs and an associated column chart for Salary versus Opinion. Express the counts as percentages so that for either salary, the

Find the mean of the sampling distribution of the sample variance. enter your response here (Round to three decimal places as needed.)

Which of the following is true of correlational studies? Group of answer choices Results determine whether one variable causes another. The researcher has control over the independent variables. If dependent variables cause independent variables to change, we can draw conclusions about cause and effect. Scientists determine whether variables are

This assignment will analyze the design and its validity, as well as the status of the results. As with the previous assignment, you will use the questions below and Rubric 3 for this assignment. Course Objectives CO 1: Think critically about the use of hypothesis testing in the behavioral sciences. CO 3: Implement the logic and mathematical basis

Chuck's z score for his height is -.1.86. Check all that apply Group of answer choices Chuck is shorter than average Chucks height is 1.86 SD above the mean Chuck is taller than average Chuck is short but not unusually short Chuck is unusually short

Los modelos de asociacin trabajan: Pregunta 3Respuesta a. Con valores numricos, por lo que no hay que realizar ninguna transformacin de variables numricas. b. Con cadenas de texto, de cualquier longitud. c. Con valores binomiales, por lo que hay hace un procesado adicional. d. Aceptan cualquier tipo de datos, numricos, binomial, texto, etc

A confidential and voluntary survey conducted in STA 3024 in the Spring of 1999 asked the students questions about their sex life. A simple linear regression analysis was conducted to predict the number of lifetime sexual partners a student has had based on the number of sexual partners the student has had in the past year. The analysis yielded an

This is data that is gathered scientifically, through observation. Question 6 options: interpretive framework secondary data sample empirical evidence

We are interested in studying the number of victims of automobile accidents handled by a hospital emergency room per week. It has been shown that on average a hospital emergency room handles 14 victims of automobile accidents per week. Which of the following statements is true? Group of answer choices The variable described has a Normal

Q2. Perform and interpret a t- test with SPSS. (13 points) A researcher would like to know if memory function changes significantly from the first testing session ( Mem1 ) to the second testing session ( Mem2 ). Perform a two-tailed t- test with = .05 to answer the following question: Does memory performance change significantly from the first

As groups of data become more homogenous, entropy becomes higher (closer to 1). True False

c. Compare the population range to the mean of the sample ranges. Choose the correct answer below. A. The population range is equal to the mean of the sample ranges. B. The population range is equal to the age of the oldest official at the time of death and the mean of the sample ranges is equal to the youngest official at the time of death. C.

Two measured scores that insurers can use to determine customer satisfaction are the customer satisfaction score (CSAT) and the net promoter score (NPS). The following statements are about CSAT and NPS. Three statements are true, and one statement is false. Select the answer choice containing the FALSE statement. CSAT scores are usually based on

Modelo Educativo en donde la comunicacin docente estudiante es asncrona, adems de que el rol del docente es tanto de facilitador como de tutor del estudiante: Pregunta 4Seleccione una: Presencial Semipresencial o hbrido Virtual o a distancia Centrado en los contenidos

When comparing the box plot and histogram, we can see distinct differences in how they represent the data. The box plot that you used displays the median, quartiles, and spread of the property prices, with the median around 960,000. It effectively highlights outliers and provides an overview of the data distribution, although it does not directly

Complete this analogy: independent variable is to __________ as dependent variable is to __________. Group of answer choices relationship; direction hypothesis; evidence varied; measured internal validity; external validity

In the 2000 census of the United States, it was determined that the average household size was 2.59 persons per household. The average of 2.59 is a sample statistic population parameter

The five number summary of a much larger dataset was found to be: 47, 48, 60, 66, 69 An observation is considered an outlier if it is below: An observation is considered an outlier if it is above: Remember: this is NOT a data set, this is a 5 number summary of a larger data set

Based on data from Gill et al., 2020, maximal reduction in mortality risk occurred with ~20 minutes per day of accelerometer-measured MVPA, in comparison to the >60 minutes of self-reported MVPA required to observe maximal reductions in mortality risk

1 In logistic regression, the ratio of the probability of belonging to class 1 to the probability of belonging to class 0 is: a. Response b. Mean c. Logit d. Odds

Use the data in the following table, which lists survey results from high school drivers at least 16 years of age. Assume that subjects are randomly selected from those included in the table. Drove When Drinking Alcohol? Yes No Texted While Driving 688 2965 No Texting While Driving 186 4418 If four different high school drivers are randomly

a. What are the units of measure of height, width, and area of the region between the rate of change graph and the horizontal axis from 2000 to 2006? Height: hundred monkeys per year * Width years Area: hundred monkeys b, From 2000 to 2006, did the population of monkeys increase or decrease and by how much? The population increased by hundred

The data on the correlation between gender and rate of substance use obtained by the National Survey on Drug Use and Health do not support the common notion of people that males are more likely to indulge in substance use than females. True false question. True False

Phi is __________. the correlation in the sample an index of effect size in a chi-square analysis an index of effect size in a multiple regression analysis the correlation in the population

The National Crime Victimization Survey prevents researchers or the public from having information on a victim's: a. age. b. relationship to an offender. c. place of residence. d. gender

Variables that cannot be measured directly cannot be studied scientifically. Group of answer choices True False Flag question: Question 9 Question 97.69 pts Research measurements are made using specific procedures that define constructs. Group of answer choices True False

In which part of an article would you most likely find statistics that highlight the importance of the problem ?

u elementos debe incluir una lista de control para ser vlida y confiable? Pregunta 5 Respuesta a. Incluir una descripcin detallada del contexto educativo. b. Especificar la ejecucin adecuada y enumerar conductas relevantes. c. Clasificar a los estudiantes por nivel de aprendizaje. d. Disear un cuestionario para cada conducta

What form of recording involves a written account of observed events? Group of answer choices A-B-C checklist Pattern analysis Scatterplot Narrative recording

A student has collected the following data of distance versus time. Assume that the distance is a linear function of time. What are the slope of the linear best fit and the correlation coefficient? You can use MS Excel to find the slope and the correlation coefficient. Time Distance 2.0 5.0 4.0 9.5 6.0 14.3 8.0 20.4 10 25.2 12 29.3 14 34.8 16 40.4

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