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Mathematics Questions and Answers September 10, 2018

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Write down the PDF of a generic normal r.v. Convert back and forth between a standard normal r.v. and a generic normal via linear transformation Find the PDF of a linear transformation and sum of normals State the The Central Limit Theorem in full, from scratch Use the central limit theorem to approximate the distribution of a running sum, or

In an experiment in which extraneous variables are present, how does the presence of an extraneous variable affect the results? Group of answer choices It proves that the independent variable is responsible for the differences between conditions It proves that all the conditions of the experiment, except for the independent variable, were held

What does this analysis show and how can the results be used Correlations Sum of Event Promotions Sum of Quantity Sold Sum of Event Promotions 1 Sum of Quantity Sold 0.94 1 Sum of Social Media Posts Sum of Quantity Sold Sum of Social Media Posts 1 Sum of Quantity Sold 0.90 1 Sum of Flavor Rating Sum of Quantity Sold Sum of Flavor Rating 1 Sum of

If you flipped a fair coin 6 times and got 6 heads, what would be the probability of getting a head on the next toss? Enter your answers as fractions. The probability is

Display the correlation numbers among the variables in the housing data set at the column positions of 1, 6, 11, and 14. Your R code should be well commented on and well organized to explain what the code does. Take screenshots to demonstrate successful completion of your work. The screenshot should show your well-commented R code, and the

A data breach is an incident wherein information is stolen or taken from a system without the knowledge or authorization of the system's owner. The annual number of data breaches in a certain country from to were: Year Data Breaches (millions) Year Data Breaches (millions) 482 170 654 407 429 592 587 1542 322 1358 652 1386 393 1074 732 1310 Find

Consider the following sample of n = 8 measurements: 2, 25, 14, 6, 22, 7, 18, 20. Calculate the median m of this sample. Question 33 options: A) 57 B) 16 C) 18 D) 14

How is one hundred twenty-five-thousandths of a milligram written as an Arabic number with a decimal value and the appropriate unit abbreviation? Question 5 options: 1) 1.25 mcg 2) 0.125 mg 3) 12.5 mg 4) 1.25 mg

Consider a product with three components in series, with reliabilities of 0.99 , 0.68 , and 0.89 for components A, B, and C, respectively. Furthermore, component B uses a backup that also has a reliability of 0.68 . What is the reliability of the system? (Round answer to five decimal places.) Part 2 A.0.59915 0.59915 B.0.75924 0.75924 C.0.89760

National Crime Victimization Survey and the British Crime Survey both use which of the following techniques to gather data? Option A simple random samples Option B stratified sampling Option C multistage cluster sampling Option D quota sampling

Which of the following is a limitation of using the range to measure variability? OA. It gives the same result regardless of the spread of scores. OB. It ignores extreme scores in the dataset. OC. It only considers the two extreme values. OD. It is difficult to calculate without a calculator. Next

a school is gathering some data on its sports teams because it was believed that the distribution of boys and girls were evenly distributed

Cuanto mayor sea el valor de marca de las empresas en una industria, menor ser la amenaza de nuevos entrantes

Use Excel to find the variance and standard deviation for the data set below. Treat the data set as the population and as a sample. Round your answers to the tenths place. Provide your answer below: Population Standard Deviation = Population Variance = Sample Standard Deviation = Sample Variance =

Cul es uno de los problemas asociados con un alcance mal definido del currculum? Pregunta 1Seleccione una: a. Programas educativos claros y estructurados b. Sobrecarga de informacin c. Omisin de temas cruciales d. Guas detalladas de contenido para cada asignatura Pregunta 2 Completada Punta 0.00 sobre 1.00 Qu problema podra surgir si hay una

create a linear regression in Power BI with the Dataset

When the process variation is significantly lower than the width of the specification, the process is said to be Question 59Select one: a. capable. b. out of spec. c. operating at a Six Sigma level. d. out of control

How much time is spent in traffic per year by U.S. residents? 420 Million hours 1 Billion hours 4.2 Billion hours 4.2 Million hours

Using 3D graphs is always the best choice for presenting numerical data. True False

How to calculate Beta in Excel spreadsheet using a correlation matrix table?

he standard GCS is validated for use in children of what minimum age

calcultae the etiology fraction when the RR for disease associated with a given esposure is 1.2, 1.8,3, 15

Which research design is characterized by the researcher observing a population at one point in time? Longitudinal Cross-Sectional Qualitative Traditional

A Type II error is considered Group of answer choices results attributed to chance, when in fact the intervention was effective (false negative) cause of ineffective drugs going to market determined by alpha results attributed to the intervention, when in fact they were due to chance (false positive)

Which of the following numerical values provides information about a sample? Question 44Select one: a. Parameter b. Data c. Population d. Statistic

The table below lists the number of games played in a yearly best-of-seven baseball championship series, along with the expected proportions for the number of games played with teams of equal abilities. Use a 0.05 significance level to test the claim that the actual numbers of games fit the distribution indicated by the expected proportions. Games

Sum of Independent Gaussian Random Variables a. Let X, Y N (0, 1) be independent standard Gaussian random variables. Now, let W = X Z. Compute the density of W using convolution. b. Now, let U N (, 2), and V N (0, 1). Can we write U as U = aV Z, where a is a fixed scalar and Z is independent of V

The hypothesis tests that we have covered in class have to do with (a) comparing means or (b) comparing correlations. Which of the following statements is CORRECT about these two types of hypothesis tests? Question 5 options: a) Comparing means and comparing correlations must result in consistent results b) Means and correlation coefficients

[Basic Probability]Consider a joint distribution onX, Y, with Prob(X=i, Y=j) =pij, whereX {1,2}andY {1,2,3}. This is summarized in the following table:Y= 1Y= 2Y= 3X= 1p11p12p13X= 2p21p22p23Assumepijare all positive. In the following, write your answers in terms of elementsof the joint distribution above.(a) Calculate the marginal distribution

1. Incorporate the following visualization charts- Summary stats by the agency. Product line: Commercial Line/Personal Line wise analysis. Agency wise and state-wise distribution of Retention Ratio (Top 10). Hit ratio distribution across different Quotes-systems (also by PL/CL). Add a few based on your understanding of the data.

If you are trying to predict Y scores from X scores, X is referred to as the ______variable. Group of answer choices nominal predictor dependent criterion Flag question: Question 2 Question 2 4 pts Which of the following is used to compare the medians from two samples? Group of answer choices Mann-Whitney U the sign test Kruskal-Wallis one-way

Two players are playing another version of the coin matching game from page 540, where if the coins match player 1 wins coins, and if the coins do not match, player 2 wins coins. The table below shows the payoff matrix for this non symmetrical version of the game. Player 1 will use a mixed strategy of (p, 1-p) for choosing H or T. Against player

a. Let X, Y N (0, 1) be independent standard Gaussian random variables. Now, let W = X Z. Compute the density of W using convolution. b. Now, let U N (, 2), and V N (0, 1). Can we write U as U = aV Z, where a is a fixed scalar and Z is independent of V ? If you think we can, find the distribution of Z; otherwise, please explain the reason

A one-way ANOVA was conducted to analyze the relationship between flight crew age and the incidence of aviation events. The analysis revealed a significant effect of flight crew age on the incidence of aviation events, F(1,298) = 41.60, p <0.0001. Could you explain the ANOVA test results based on Null Hypothesis 1: H0: There is no significant

5.20 High School and Beyond, Part I: The National Center of Education Statistics conducted a survey of high school seniors, collecting test data on reading, writing, and several other subjects. Here we examine a simple random sample of 200 students from this survey. Side-by-side box plots of reading and writing scores as well as a histogram of the

Will two qualitative researchers working independently on the same problem statement arrive at the same results from their qualitative study? Will two quantitative researchers working independently on the same problem statement arrive at the same results from their quantitative study? Please provide a peer reviewed reference,

Merrill Kim Sharp has a system composed of three components in parallel. The components have the following reliabilities: Upper R Subscript 1equals0.89, Upper R Subscript 2equals0.91, and Upper R Subscript 3equals0.84. Part 2 The overall reliability of the system = enter your response here% (enter your response as a percentage rounded to two

In three paragraphs, write Meta-analysis: Statistical analysis of resilience indicators include summary table for Statistical analysis with mean and standard deviation

Randomly choose 5 numbers from 1-50 and 2 numbers from 1-12

should I use day month or year for histogram data

A survey asked people if they were aware that maintaining a healthy weight could reduce the risk of stroke. A 95%

All of the following techniques are used in gathering primary data except Select one: a. observational methods b. surveys c. experimentation d. analysis of financial records

content area top Part 1 The functions f(x)equalsminus2.8xplus286 and g(x)equals0.01xsquaredminus5.1xplus375 model the chance, as a percent, that a 60-year-old will survive to age x. The bar graph to the right shows the chances of 60-year-olds surviving to various ages. a. Find and interpret f(70). b. Find and interpret g(70). c. Which function

paraphrase text Both countries demonstrated low levels of rainfall, indicating that their mean and median values were quite close to each other. Overall, the calculations show that GBR experienced more rainfall and milder weather than the USA. As a result, the mean and median values for both rainfall and temperature in GBR were higher than those

Cul de las siguientes opciones es un beneficio de la comunicacin oral? Option A Es la mejor opcin cuando se intenta llevar una gran cantidad de informacin compleja. Option B Elimina la necesidad de tener minutos durante una sesin o introducir notas personales sobre las acciones de seguimiento en una agenda. Option C Permite a los participantes a

This statement is true because the chi-square test of independence (or association) examines whether two categorical variables are related to each other, which is fundamentally a correlational concept. True

6 True or False. Data can be presented by using different types of dashboards. True False

Given the dataset: 10, 20, 30, 20, 40, 50, 30, 20, 30, 50. Calculate the median

Discuss how your test relates to the hypothesis and discuss the statistical significance. Explain in one paragraph how your test decision relates to your hypothesis and whether your conclusions are statistically significant.

Two numeric variables change in the same direction, i.e. when one increases the other is also observed to increase. The correlation of these variables can be described as what? A. Perfect negative B. Positive C. Perfect positive D. No correlation E. Negative

u propuestas o planteamientos propone Miranda, F., FLACSO para la re-escolarizacin de los jvenes en Mxico? Pregunta 3 Seleccione una: Descentralizacin de todo lo relativo a la educacin, ya que lo ideal es el traslado de estos asuntos a entidades locales Nuevo modelo escolar, nueva oferta educativa y poltica educativa, pedagoga afectiva, juventudes

The dataset names.dta contains information regarding job postings and resumes of applicants. This dataset is the basis of a remarkable (and quite famous) paper by Bertrand and Mullinathan published in 2004. You will probably want to use the variable call_back as your dependent variable

In this design a sample of homogeneous experimental units is randomly assigned to "treatments," that is, different experimental or environmental conditions. For example, a group of homogeneous laboratory mice is randomly divided into three groups. One group is given a new experimental drug, the second is given the standard drug, and the third

Is finding the critical value, the p-value, and making a decision done the same way as it is when hypothesis testing for one mean

a. Page 1 - Cover page (See the sample document.) b. Page 2 - This page will be an image of a completed navigation log. Quality must be good enough for ease of reading. You may either fill in the text boxes of the existing navlog from the sample or you can complete one from your flight school that you scan or take a high-resolution image of from

[Moments from Generating Functions] The coefficients in the Taylor expansion of an MGF are the raw moments of the associated distribution. We can use this property to compute the moments simultaneously. (a) Suppose U Uniform([0, 1]). Find the MGF, MU (t). (b) Taylor expand MU (t) by Taylor expanding each exponential in MU (t) separately, then

Nurse educators are reviewing scores from an examination to determine which score occured most frequently. Which term represents the most frequent score in a frequency distribution? Group of answer choices Percentile Mean Mode Median

A researcher cannot use Anyword to generate research papers. a. Maybe b. True c. Unknown d. False

Some of the outputs that should have printed out from your function were not found; Did not find all the following values in the same row: age, int64, 1338; Did not find all the following values in the same row: sex, object, 1338; Did not find all the following values in the same row: bmi, float64, 1338; Did not find all the following values in

Q2)Three t- tests: JASP (15 points total) The variables for this question are included in a data set from a similar study to the one you saw in the PowerPoint lecture this week. RQ1: In this study, participants were assigned to either a high-screen resolution condition or a low-screen resolution condition. In both of these conditions, each

An opinion poll reported that, when interviewed, nearly 80% of the teens said they were not interested in being the president of the United States. When asked "What's the main reason you would not want to be president?" they gave the following responses. Other career plans/no interest (OP) 38% Too much pressure (P) 18% Too much work (W) 16%

what does each variable explain or mean Sum of Advertising Expenses Mean 4064.418625 Standard Error 167.1923056 Median 3850.477337 Mode #N/A Standard Deviation 1003.153834 Sample Variance 1006317.614 Kurtosis 0.630139648 Skewness 0.910870668 Range 4145.833172 Minimum 2313.397284 Maximum 6459.230455 Sum 146319.0705 Count 36

Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout. Suppose a friend tells you that the average length of trout caught in Pyramid Lake is ???? = 19 inches. However, a survey reported that of a random sample of 51 fish caught, the mean length was x = 18.4 inches, with estimated standard deviation s =

Some places to be particularly careful about confidential information are: Option A a. using your cell phone in public Option B b. talking in public places such as restaurants Option C c. using your laptop computer on an airplane Option D d. all of the answers listed are correct

The probability that a machine produces a defective item is 0.02. Each item is checked as it is produced. Assume that these are independent trials, and compute the probability that at least 90 items must be checked to find one that is defective.

where can I add the figures in this apa result and findings - This mixed-methods study aimed to explore the digital literacy levels of first-year college students, examining both quantitative and qualitative aspects. The research was guided by several key questions regarding students' self-assessment of digital skills, the perceived importance of

Given your research, a cross-sectional study design is sufficient because you can collect the answers for both questions at the same time and no intervention is implemented. Given your study findings, how would you assess the effect of gender on your research question?

In stratified random sampling, Group of answer choices every individual has an unequal chance of being selected from the population for the sample. data is not divided into sub-groups sharing common characteristics like ethnicity, age, sex, race, income, and education. every individual has an equal chance of being selected from the population for

Arrests for drug crimes typically account for _______ percent of all arrests reported to the FBI. Question 12 options: A) 12 B) 6 C) 22 D) 15

Compared to quantitative research, how is qualitative research generally perceived? Group of answer choices It is generally less subjective than quantitative research. It is viewed as being less flexible than quantitative research. It is regarded as less reliant on statistics than quantitative research. It is seen as being less meaningful than

An example of a discrete random variable is the time it takes to answer this question the number of items sold at a store on a certain day the marathon time of a given runner how much a plant grows in one week

Es un ejemplo de indicador de resultado. Seale la respuesta correcta. Seleccione una: a. Porcentaje de mujeres de 25 a 49 aos que han sido tamizadas contra el cncer de cuello uterino y resulto positivo doce meses antes de concluir el programa. b. Porcentaje de mujeres de 25 a 49 aos que han sido tamizadas contra el cncer de cuello uterino. c.

The B&K Real Estate Company sells homes and is currently serving the Southeast region. It has recently expanded to cover the Northeast states. The B&K realtors are excited to now cover the entire East Coast and are working to prepare their southern agents to expand their reach to the Northeast. B&K has hired your company to analyze the Northeast

An avant-garde clothing manufacturer runs a series of high-profile, risque ads on a billboard on Highway 101 and regularly collects protest calls from people who are offended by them. The company has no idea how many people in total see the ad, but it has been collecting statistics on the number of phone calls from irate viewers: Type Description

5. A customer wants delivery to be ensured between 10 am and 2 pm. Your truck leaves the factory at 4 am and the time taken to reach the customer is normally distributed with an average of 8 hrs and a standard deviation of 1 hr. What is the process capability ratio of the process

According to the Epidemic Model the number of new technology adopters Group of answer choices the number of adopters increases over time. the rate of diffusion is fastest towards the middle of the diffusion process, in the simplest version of the model the fastest rate of adoption per period is when exactly 50 per cent of the target population are

Police plan to enforce speed limits during the morning rush hour on four different routes into the city. The traps on routes A, B, C, and D are operated 40% , 30%, 20%, and 30% of the time, respectively. Thomas always speeds to work, and he has probability 0.2, 0.1, 0.5, and 0.2 of using those routes. 1. What is the probability that he will get a

why not option 4 of The pvalue of 0.022 indicates that the data provide strong evidence against H0: 0.90. H0 is rejected at = 0.10. The status quo has changed

Considering that children are mutual educators who are competent, confident, and equal partners in the pedagogical processes, it is clear they must have a role in: a. Planning b. Questions c. Observations d. Children

Error variance for measures of inter-item consistency comes from Group of answer choices fatigue. motivation. practice effect on test measurements. heterogeneity of test items

email sample saying that Every second Tuesdays in month are the time allocated for botox. Tech also gets third Tuesday of alternating months

Determine whether the distribution below represents a probability distribution. x P(x) 3 -.3 6 .5 9 .1 12 .3 15 .4 Is a probability distribution; the probabilities sum to 1. Not a probability distribution; the probabilities do not sum to 1. Not a probability distribution; a probability value cannot be negative. Not a probability distribution; a

Respecto al proceso de desmontado de llantas, se tomaron muestras de tiempo para valores individuales, el tiempo objetivo (en minutos) es de 3.4 +/- 0.5 Interpreta si el proceso se encuentra bajo control estadstico, con base en la grfica de control de promedios para valores individuales. 3 metodos.png Grupo de opciones de respuesta El proceso de

I need help solving this problem. Is there a significant association between coding experience and software development efficiency? The aim is to provide an interpretation of this association or no association. From the preceding question, what statistical analysis can I conduct in Jamovi. Depending on if the variables are categorial (Nominal or

Now the PID for the system needed to be tuned using the previously designed model. Slight adjustments were made to the model, allowing for the implementation of the PID controller. Again, the main goal was to zero out the derivatives and analyze any graphs produced until a desired outcome is reached. Most of the codes were tested in regular

Identify the type of verbs (transitive, intransitive, linking) for gave and win. Practicing her downhill ski routine every day gave Lindsay the confidence to join the ski team and to eventually win an Olympic medal.

The correlation between the two variables of interest is 0.81, which has a p-value of 0.0337. This means ______. Group of answer choices that the null hypothesis is rejected that the research hypothesis is rejected that the null hypothesis cannot be determined that the null hypothesis is accepted

A study was made to compare the plasma lactate concentration in Dutch Warmblood horses cantering at a constant speed either on a track or on an inclined treadmill. The speed was chosen as the horse's own comfortable speed on the track. Samples were taken after 5 minutes' cantering on the track and treadmill, the order of which was randomized for

Suppose the winner is decided by plurality. Analyze whether this choice satisfies the four fairness criteria

We will employ a significance level of 0.05, or 5%, to robustly test this hypothesis. By confidently applying these statistical tests, we can derive valuable insights into the regional housing market, specifically regarding the listing price for homes in the West South Central region. These insights enable us to make informed decisions within the

Example 20.4 in the text asks "Do Chimpanzees Collaborate?" The conclusion states: "The data give very strong evidence (p < .0005) that chimpanzees recruit a collaborator more often when faced with a problem that requires a collaborator to solve. That is, chimpanzees recognize when collaboration is necessary, a skill that they share with humans."

Use the error rate formula which is (FP + FN) / (TP + FP + FN + TN)

What is the general way of finding the critical region for means, proportions, and variances

Suppose a city manage conducts a poll and finds that 95% condifidence interval for the proptotion or redients who support parking restrictions duirng a snow removal periods as 63% to 71%. Explains that this confidence interval means

18-1. Effects of Collusion You hold an auction among three bidders. You estimate that each bidder has a value of either $16 or $20 for the item, and you attach probabilities to each value of 50%. What is the expected price? If two of the three bidders collude, what is the price

Reliability and validity are handled precisely in the same ways in qualitative inquiry as they are in quantitative inquiry. Group of answer choices True False

A deck of cards contains RED cards numbered 1,2,3,4,5 and BLUE cards numbered 1,2. Let R be the event of drawing a red card, B the event of drawing a blue card, E the event of drawing an even numbered card, and O the event of drawing an odd card. Drawing the Red 1 is one outcome of which of the following events? Select all correct answers

A researcher wants to better understand how alcohol consumption affects driving performance. She invites 50 people into a testing lab, and randomly divides them up into five different between-subjects experimental groups. One group doesn't drink any alcohol and the other four groups are made to drink different amounts of alcohol. After this, the

Which of the following is the sales prediction technique based on the correlation between sales and other factors such as population density, per capita income, or family size? a. A market test b. An expert survey c. Regression analysis d. Time series analysis e. Executive judgment

A tire company makes tires that have a normal distribution with a mean of 80000 miles with a standard deviation of 1500 miles prior to needing replacement. A tire that wears out in the top 1% of miles lasted before needing replacement is considered exceptionally well made. Use R/Rcmdr to find the lowest number of miles that a tire would have to

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