Why is it important to determine if the underlying assumptions in a statistic are met?Because if not, the chosen statistic may not be appropriate for the study and therefore the results may not beaccurate.Because when selecting the variables, there are things that are not known but need to be included.Because without determining this, the sample size cannot be determined.Because if not, the number of appropriate variables measured in a given statistical analysis cannot be known.

Answered: Why is it important to determine if the…

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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When two births are randomly selected, the sample space for genders is bb, bg, gb, and gg. Assume that those four outcomes are equally likely. Construct a table that describes the sampling distribution of the sample proportion of girls from two births. Does the mean of the sample proportions equal the proportion of girls in two births? Does the result suggest that a sample proportion is an unbiased estimator of a 1 1 population proportion? For the entire population, assume the probability of having a boy is the probability of having a girl is, and this is not affected by how many boys or girls have previously been born. Determine the probabilities of each sample proportion. Sample proportion of girls ▼ ▼ ▼ Probability (Type integers or simplified fractions.)
Which of the following is NOT a misuse of statistics?Choose the correct answer below.A.Utilizing valid statistical methods and correct sampling techniquesB.Concluding that a variable causes another variable because they have some correlationC.Misleading graphsD.Making conclusions about a population based on a voluntary response sample
Statement I. One way ANOVA will be utilized. Statement II. We are dealing with uncorrelated sample means. Statement III. We are dealing with correlated sample means. Statement IV. N is equal to 15. * Treatments Participant No Phone Hand-Held Hands-Free 1 4 1 2 3 1 2 3 6. 3 2 4 3 1 5 4 "Hypothetical data from an experiment examining driving performance under three telephone conditions. Statements I, Il are TRUE Statements I, II, I are FALSE Statements I, I, IV are TRUE O None of the above
There are three different ways I can go to work in the morning. I want to see if there is a difference in the distributions of travel-times between the three different ways. The sample data is depicted below. I claim there is a difference in mean travel times between the three different routes. I cannot guarantee that the distributions of these travel times are Normal. Travel Time in Minutes Interstate 22 22 21 23 22 21 Route 15 22 18 20 18 Back Roads 19 19 18 19 22 (a) Enter the rank values in the same order as in the original sample. Interstate Route 15 Back Roads (b) Give the value of the test statistic: (c) Test my claim at the 10% significance level.Enter the critical value: There is sufficient evidence to conclude that the population means are not equal.YesNo (d) Does your conclusion change at the 5% significance level?YesNo
Consider the following research questions/study scenarios. For each study, discuss the most appropriate methods for describing the data (graphically and numerically). What statistical method would be most appropriate for addressing the research questions? Be sure to provide a justification of the statistical method. What statistical test is needed, provide appropriate null and research hypotheses. An investigation of the association between drink preferences and the color of teeth is proposed. Subjects will be surveyed as to the type of drink most often consumed (coffee/tea. Juice, caramel-colored soda, water, or milk). A clinical exam will be performed after dental cleaning to determine the color of the teeth (reddish brown, reddish yellow, gray, reddish gray).
1. In each of the following parts, state the statistical analysis technique or approach that youwould use and give reasons for choosing that analysis. No calculations are required.a. Upper Hill Medical Services would like to know not just whether patients have high bloodpressure, but also what influences having high blood pressure. The Institute of Diabetes andKidney Diseases conducted a study on 2,768 adult females. The following variables wererecorded number of times pregnant, plasma glucose concentration a 2 hours in an oral glucosetolerance test, diastolic blood pressure (mm hg), triceps skin fold thickness (mm), 2-hour seruminsulin (mu u/ml), body mass index (weight in kg/(height in m2)), diabetes pedigree function,age (years) and a test whether the patient shows signs of diabetes (coded 0 if negative, 1 ifpositive).b. Arodi and Company based in Mombasa Kenya is an online t-shirt sales company investedin Google AdWords advertising as follows KSh 1 million, KSh 1.5 million and KSh…
1. Data Set lists data from 100 M&Ms, and 27% of them are blue. The Mars candy company claims that the percentage of blue M&Ms is equal to 24%. Use a 0.05 significance level to test that claim.
Identify which statistical test is to be used in the following problems. 1. Is the given sample mean of 74 production units per day equal to the population mean? 2. Would thirty high school graduating students change in their self-concept after knowing they had passed an important test? 3. Is employee’s rank correlated with efficiency rating? 4. Did the method of teaching interact with students’ learning styles? What is the interaction effect of the method of teachings and medium of instruction on the achievement of students in Probability and Statistics? 5. Is IQ level associated with gender? 6. Is there a significant difference between the two sections of Senior High School in terms of academic achievement in Calculus?
c) Comparison between the number of persons who have or do not have a disease of the circulatory system and their diet classified into one of three categories: vegetarian, mixed meat and vegetables and most meat. what statistical test method can be used for the above situation
5. The ABC University wants to know the proportion of its football fans travel to away games in the same state. The university took a random sample of 2000 of its football fans and found that 500 of them travel to away games in the state. • Identify the population for this situation. What is the parameter? What is the sample? • Identify the sample statistic. Can the university estimate the population proportion based on the sample? Explain your answer.
Choose the correct answer for the following questions. 1. One disadvantage of using computers to perform statistical analysis is: A. Computers make performing complex statistics much more difficult B. Complex statistical tests can be easily run on a computer but may be is interpreted by the novice researcher C. Data entry is much more time consuming D. Computer analyses create more sampling bias 2. What is the best method for measuring how students in your program are feeling about the program over a 2 year period of time? A. Latitudinal study B. Cohort study C. Cross-sectional study D. Quantitative study 3. Mary is measuring how students in her class feel one day. What type of research is she conducting? A. Longitudinal B. Cross-sectional C. Latitudinal D. Cross-reference
The area of inferential statistics called hypothesis testing is a decision-making process for evaluating claims about a population parameter, based on information obtained from samples. True or false

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