Q10 Which design approach requires the researcher to have access to a large number of pretest andposttest observations.Select one:O a. Quasi-experimental equivalent control group designs.O b. Quasi-experimental time series group designs.O c. Quasi-experimental interrupted time series design.O d. Quasi-experimental non-equivalent control group designs.

The design approach which requires the researcher to have access to a large number of pretest and…

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Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.5: Comparing Sets Of Data

Problem 14PPS

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The stated goal of a chain of service stores is to provide a lube and oil change for anyone's automobile in 15 minutes. The manager at one store thinks that there is a growing disparity among his workers in the time it takes to lube and change the oil of an automobile. To monitor this, the manager has selected a sample of 20 days and has recorded the time it took five randomly selected employees to service an automobile. The data are found below. Complete parts a through d Click the icon to view the data. a. The manager noticed that the longest time it took to service a car was 25.73 minutes. Suppose the distribution of fimes to service a car was normal, with a mean of 15. Without analyzing the sample data, use your knowledge of a normal distribution to give the manager an estimate for the population standard deviation for the time it takes to service a car. The standard deviation is minutes. (Round to two decimal places as needed.) b. Use the data to construct an x- and an R-chart.…
Enlist the types of experimental designs. Provide the details regarding their validity and procedure by formulating tables.
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Ackerman and Goldsmith (2011) compared learning performance for students who studied the same material present on a computer screen. All students were then given a test on the material and the researchers recoded the number of correct answers. a. identify the dependent variable for this study. b. is the dependent variable discrete or continuous ? c. what scale of measurement ( nominal, ordinary, interval, or ration) is used to measure the dependent variable?
Which of the following is the best description of a multiple-baseline design? a. A study that takes several measures on nonequivalent groups before and after treatment. b. A study that takes baseline measures, then introducing the independent variable, and then retaking the baseline measures. c. A study that assesses the effects of introducing the treatment at different times over multiple subjects, behaviors, or situations. d. A study that reintroduces the independent variable after the second baseline measure.
Joan's Nursery specializes in custom-designed landscaping for residential areas. The estimated labor cost associated with a particular landscaping proposal is based on the number of plantings of trees, shrubs, and so on to be used for the project. For cost estimating purposes, managers use one and half hours of labor time for the planting of a medium-sized tree. Actual times from a sample of 10 plantings during the past month follow (times in hours). 2.3 0.9 2.1 1.4 3.2 2.4 2.1 1.8 3.3 1.4 With a 0.05 level of significance, test to see whether the mean tree-planting time differs from one and half hours. a. State the null and alternative hypotheses. H0 : =u 1.5 Ha : not=u 1.5 b. Compute the sample mean. (to 1 decimal) c. Compute the sample standard deviation. (to 3 decimals) d. What is the p-value? t-value (to 3 decimals) p-value e. What is your conclusion? We reject the null. There enough evidence to prove that the mean tree-planting time differs from hours

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