2. Describe how each of the following would affect the power of an analysis (increase ordecrease) and why:a. You decide to draw only from a subpopulation within which people have more incommon than in the overall population.b. Your research budget runs dry and you have to stop gathering data before youreach your planned sample size.c. You place a very high priority on making sure the null is not rejected unless it isalmost certainly false.

Statistical power is the probability of a hypothesis test of finding an effect if there is an effect…

Answered: Describe how each of the following…

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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2. What is the sample size of a certain study if the population size is 1,000,000 and 10% margin of error are expected? a.400 c,200 b.300 d.100 3.Which of the following examples is secondary data? a.Direct Interview c.journals b.Indirect or Questionnaire d.Observation
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…
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?
. Control charts are classified by the a. shape of the distribution. b. type of data they contain. c. null hypothesis. d. sample size.
1. Solve the given problem using the stepwise method in testing hypotheses. What is the correlation between these two variables: use .05 level of significance (two-tailed). Stress Sense of Humor 4 2 10 8 12 11 5 3 7 8 6 7 2 3 14 13
A statistical program is recommended. Jensen Tire & Auto is in the process of deciding whether to purchase a maintenance contract for its new computer wheel alignment and balancing machine. Managers feel that maintenance expense should be related to usage, and they collected the following information on weekly usage (hours) and annual maintenance expense (in hundreds of dollars). Weekly Usage (hours) Annual Maintenance Expense 13 17.0 10 22.0 20 30.0 28 37.0 32 47.0 17 30.5 24 32.5 31 39.0 40 51.5 38 40.0 (a) Develop the estimated regression equation that could be used to predict the annual maintenance expense (in hundreds of dollars) given the weekly usage (in hours). (Round your numerical values to two decimal places.)
Refer to the sample of body temperatures (degrees Fahrenheit) in the table below. Given these temperatures, what issue can be addressed by conducting a statistical analysis of the data? Subject 2 3 4 5 1 97.0 98.5 97.6 97.7 98.7 8 AM 12 AM 97.6 97.8 98.0 98.4 98.4 Choose the correct answer below. OA. The data can be used to address the issue of whether there is a correlation between body temperatures at 8 AM and at 12 AM. OB. The data can be used to address the issue of whether there is a difference between average body temperature for males and for females. OC. The data can be used to address the issue of whether there is a correlation between average body temperature and a person's exposure to sunlight. OD. The data can be used to find the percentage of people whose body temperature increases with illness. DELL
A statistical program is recommended. Jensen Tire & Auto is in the process of deciding whether to purchase a maintenance contract for its new computer wheel alignment and balancing machine. Managers feel that maintenance expense should be related to usage, and they collected the following information on weekly usage (hours) and annual maintenance expense (in hundreds of dollars). Weekly Usage(hours) AnnualMaintenanceExpense 13 17.0 10 22.0 20 30.0 28 37.0 32 47.0 17 30.5 24 32.5 31 39.0 40 51.5 38 40.0 #1) Develop the estimated regression equation that could be used to predict the annual maintenance expense (in hundreds of dollars) given the weekly usage (in hours). (Round your numerical values to two decimal places.) #2) The expected expense of a machine being used 34 hours per week is $ hundred.
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

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