There is some concern that if women over age 57 who takesupplemental hormones also drink alcohol, their hormone levelswill drop too low. Eleven volunteers on hormone therapy wererandomly divided into two groups, as were 12 other volunteersnot on hormone therapy. In each case, one group drank analcoholic beverage, the other a nonalcoholic beverage. An hourlater everyone's hormone level was checked. Only those onsupplemental hormones who drank alcohol showed a markeddecrease.The response variable isf) Identify the design (completely randomized, blocked, ormatched).This experiment has ag) Identify whether the experiment was blind (or double-blind).design.OA. This experiment is double-blind.OB. It is not known whether any blinding occurred.OC. This experiment is single-blind. The evaluators wereblinded.O D. This experiment is single-blind. The subjects wereblinded.h) Identify the nature and scope of the conclusion regardingwhat the results of the experiment may or may not indicate.O A. This experiment indicates that drinking alcohol leads todangerous hormone levels among those takinghormone supplements.OB. This experiment indicates that drinking alcohol leads todecreased hormone levels among those takinghormone supplements.OC. This experiment indicates that taking hormonesupplements leads to decreased hormone levelsamong those drinking alcohol.OD. The experiment indicates that women over 57 who takehormone supplements should not drink alcohol. KThere is some concern that if women over age 57 who takesupplemental hormones also drink alcohol, their hormone levelswill drop too low. Eleven volunteers on hormone therapy wererandomly divided into two groups, as were 12 other volunteersnot on hormone therapy. In each case, one group drank analcoholic beverage, the other a nonalcoholic beverage. An hourlater everyone's hormone level was checked. Only those onsupplemental hormones who drank alcohol showed a markeddecrease.a) Identify whether the above research is an observational studyor an experiment.The described research is anb) Identify the subjects studied.The subjects werec) Identify the factor(s) in the experiment, and the number oflevels for each.How many factors are involved in this experiment?(Type a whole number.)In the table below, name the factor(s) and the number of levelsof each.Factor▼This experiment has aNumber of Levels(Type a whole number.)d) Identify the number of treatments.This experiment usede) Identify the response variable measured.The response variable isf) Identify the design (completely randomized, blocked, ormatched).treatments. (Type a whole number.)design.

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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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An article included data from a survey of 2587 hiring managers and human resource professionals.The article noted that many employees are using social networks to screen job applicants and that this practice is becoming more common. Of the 2587 people who participated in the survey, 1300 indicated that they use social networking sites ( such as Facebook, MySpace, and LinkedIn) to research job applicants. For the purposes of this exercise, assume that the sample is representative of hiring managers and human resource professionals. d. suppose that researchers wanted to estimate the proportion of hiring managers and human resource professionals who screen job applicants using social networks. determine the sample size required to estimate the proportion of employers using social networks to screen job applicants to within .03 with 99% confidence. ( round your answer up to the nearest whole number ) hint: use formula that is used when the p estimate is unknown
A food-frequency questionnaire is used to measure dietary intake. The respondent specifies the number of servings of various food items they consumed over the previous week. The dietary cholesterol is then quantified for each respondent. The researchers were interested in assessing if there was an association between dietary cholesterol intake and high blood pressure. In a large sample of individuals who had completed the questionnaire, 250 persons with a high dietary cholesterol intake (greater than 300 mg /day) were selected and 250 persons with a low dietary cholesterol intake (less than 300 mg/day) were selected. The 500 selected participants had their medical history taken and were classified as having normal or high blood pressure. The data are given here. Dietary Cholesterol Blood Pressure Total High Low High 159 91 250 Low 78 172 250 Total 237 263 500 Test 2: two-tailed test for comparing two independent proportions Clearly state…
A researcher believes that there may be a negative association between the quantity of fertilizer used and the percentage of the population who live in rural areas in different countries. The data below shows the percentage of the population who live in rural areas and the fertilizer use measured in kg per hectare, for a random sample of 11 countries. 33%= 76kg, 6%=44kg, 58%= 6kg, 35%=68kg, 81%=3kg, 69%=10kg, 61%=7kg, 7%=176kg,74%=5kg, 71%=137kg, 17%=157kg Use the Spearman's rank order coefficient method to affirm or disagree with the researchers assumption.
According to Pew Research Center surveys, 79% of U.S. adults were using the Internet in January 2011 and 83% were using it in January 2012 (USA TODAY, January 26, 2012). Suppose that these percentages are based on random samples of 1720 U.S. adults in January 2011 and 1970 in January 2012. a. Let p, and p, be the proportions of all U.S. adults who were using the Internet in January 2011 and January 2012, respectively. Construct a 95% confidence interval for p, - P2- Round your answers to three decimal places. to i
An educational psychologist is interested in whether using a child’s own name in a story affected attention span while reading. Six children were randomly assigned to read a story under ordinary conditions (using common and generic names). Five other children read versions of the same story, but with each child’s ownname substituted for one of the children in the story. The researcher measured the amount of time (in minutes) each child spent reading the story. The results are shown in the following table. Does including the child’s namemake any difference in attention span? Test the hypothesis at an alpha set to .05, following these steps: a) write the null and alternative hypotheses; b) determine the critical value(s); c) draw the comparison distribution with rejection region(s) shaded; d)use the correct formula to compute the test statistic; e) state the statistical decision; f) state a brief conclusion.
Do larger universities tend to have more property crime? University crime statistics are affected by a variety of factors. The surrounding community, accessibility given to outside visitors, and many other factors influence crime rate. Let x be a variable that represents student enrollment (in thousands) on a university campus, and let y be a variable that represents the number of burglaries in a year on the university campus. A random sample of n = 8 universities in California gave the following information about enrollments and annual burglary incidents.x 12.3 28.6 24.5 14.3 7.5 27.7 16.2 20.1y 23 72 39 23 15 30 15 25 a) Compute r. (Round your answer to four decimal places.)
Do larger universities tend to have more property crime? University crime statistics are affected by a variety of factors. The surrounding community, accessibility given to outside visitors, and many other factors influence crime rate. Let x be a variable that represents student enrollment (in thousands) on a university campus, and let y be a variable that represents the number of burglaries in a year on the university campus. A random sample of n = 8 universities in California gave the following information about enrollments and annual burglary incidents. x 10.9 30.4 24.5 14.3 7.5 27.7 16.2 20.1 y 23 76 39 23 15 30 15 25 (a) Make a scatter diagram of the data. Then visualize the line you think best fits the data. A scatter diagram has a horizontal axis labeled "x (student enrollment (in thousands))" with values from 7.5 to 30.4 and a vertical axis labeled "y (annual number of burglaries)" with values from 15 to 76. The scatter diagram has 8 points. A pattern goes up and…

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