Free recall memory strategy. Psychologists who study memory often use a measure of "free recall" (e.g., the number of correctly recalled items in a list of to-be- remembered items). The strategy used to memorize the list-for example, category clustering-is often just as
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- Take a look at the following scatter plot of the so-called XOR data-set: It is a classification data-set with the goal of separating the red and the black observations. Assume, that thenumber of red and black observations is approximately equal. Which of the following statements is correct?a) A Decision Tree can reach a prediction error of (nearly) zero on this data-set.b) When performing a variable selection using the step-wise forward selection algorithm, neither of the variablesx1, x2 will be added to the model.c) A Linear Discriminant Analysis (LDA) can reach a prediction error of (nearly) zero on this data-set.d) Every model using only one of the two variables x1, x2 will have a missclassification error of approximately 50%.Gaucher, Friesen, and Kay (2010) found that masculine-themed words (such ascompetitive, independent, analyze, strong) are commonly used in job recruitmentmaterials, especially for job advertisements in male-dominated areas. In a similarstudy, a researcher counted the number of masculine-themed words in jobadvertisements for job areas, and obtained the following data.Area Number of Masculine WordsPlumber 14Electrician 12Security guard 17Bookkeeper 9Nurse 6Early-childhood educator 7Determine what kind of graph would be appropriate for showing this distribution andsketch the frequency distribution graph.People are classified as hypertensive if their systolic bloodpressure (SBP) is higher than a specified level for their agegroup, according to the algorithm in Table 5.1.Assume SBP is normally distributed with mean andstandard deviation given in Table 5.1 for age groups 1−14and 15−44, respectively. Define a family as a group of twopeople in age group 1−14 and two people in age group15−44. A family is classified as hypertensive if at least oneadult and at least one child are hypertensive. 5.17) What proportion of 1- to 14-year-olds are hypertensive? 5.18) What proportion of 15- to 44-year-olds are hyper-tensive?
- which option is correct The data mining term of "score" is known as a(n) _______________ in statistical terminology. Multiple Choice forecast record algorithm featureAlthough there is a popular belief that herbalremedies such as Ginkgo biloba and Ginseng mayimprove learning and memory in healthy adults,these effects are usually not supported by wellcontrolled research (Persson, Bringlov, Nilsson,and Nyberg, 2004). In a typical study, a researcherobtains a sample of n = 16 participants and has eachperson take the herbal supplements every day for90 days. At the end of the 90 days, each person takesa standardized memory test. For the general population, scores from the test form a normal distributionwith a mean of μ = 50 and a standard deviation ofσ = 12. The sample of research participants had anaverage of M = 54.a. Assuming a two-tailed test, state the null hypothesis in a sentence that includes the two variablesbeing examined.b. Using the standard 4-step procedure, conduct atwo-tailed hypothesis test with α = .05 to evaluatethe effect of the supplements.The MAKSI FEB UI program is considering buying a copier machine among 5 (five) types, namely the FC1, FC2, FC3, FC4 and FC5 types, where each type has different efficiency in terms of the speed of the number of pages (sheets) copied in one minute. Six staff members conducted an experiment to run each type of copier. The following data shows the number of copied pages (sheets) that can be produced in one minute according to the type of copier, 1 trial, and according to the staff assigned to run each type of copier: FC1 FC2 FC3 FC4 FC5 Staff 1 60 50 63 60 64 Staff 2 56 55 65 58 60 Staff 3 54 56 65 56 58 Staff 4 56 57 67 65 60 Staff 5 54 56 65 60 60 Staff 6 55 52 58 60 55 Some of the results of the calculation of the sum of squares (sum-square) and the average squared (mean square) required for the ANOVA test are provided in the following table: Source of Variation SS Df MS Fstat FTable CopierMachine 333.33 ……… ……… ……… ……… Staff ……….. ……… ……… ……… ……… Error 129.47 ……… ……… Total 532.67 …………
- you are asked to create a stemplot for a collection of four digit pieces of data: 6574, 2089, 8891, 6452, 1446, 7799. What is the optimal number of digits in each stem?Researchers conducted a study to find out if there is a difference in the use of online-learning by different age groups. Randomly selected participants were divided into two age groups. In the 16 to 29-year-old group, 7% of the 628 surveyed use online-learning, while 11% of the 2,309 participants 30 years old and older use online learning. (Set 1 for 16-29 year old group; Set 2 for 30 years old and older). Find the p-value of 2-prop-z-test.In many colleges, educators are changing their approach to instruction from a “teacher/lecture-centeredmodel” to a “student-centered model” where students learn in a laboratory environment in which lectureis deemphasized and students can proceed at a pace suitable to their learning needs. In once schoolwhere this model was being introduced, of the 743 students who enrolled in the traditional lecture model, 364 passed; of the 567 in the student-centered model, 335 passed. Use a 0.05 level ofsignificance to test the claim that student-centered model results in a higher pass rate than the traditionalmodel?
- Researchers conducted a study to find out if there is a difference in the use of online-learning by different age groups. Randomly selected participants were divided into two age groups. In the 16 to 29-year-old group, 7% of the 628 surveyed use online-learning, while 11% of the 2,309 participants 30 years old and older use online learning. (Set 1 for 16-29 year old group; Set 2 for 30 years old and older). Find X2.The article “A Music Key Detection Method Based on Pitch Class Distribution Theory” (J. Sun, H. Li, and L. Ma, International Journal of Knowledge-based and Intelligent Engineering Systems, 2011:165–175) describes a method of analyzing digital music files to determine the key in which the music is written. In a sample of 307 pop music selections, the key was identified correctly in 245 of them. In a sample of 347 new-age selections, the key was identified correctly in 304 of them. Can you conclude that the method is more accurate for new-age songs than for pop songs?A study was done to determine if the time of day affected ther performance of a certain alegebra class. the same class was used in the experiment over a 6-day time span.