GLOBE861%10:3211Suppose a unvemuty wahes to compae the effectivemess of four leaming modalities (Face-to-Face,Online, Blended, Course Leaning Mfodule) for a particular course. Twenty-four students are randomlyassigned to the leaming modalities, with 7, 6, 6 and 5 respectively. At the end of coune, a test (out of s0)wa given and the perfonance of the students were reconded as follows:Blended30CLM2515152325Face to-FaceOnline232320303528182025181528332523332840What is the null hypothesis?Select the correct response:The mean performance of studentsassigned to the various learningmodalities are different.There is no significant differenceamong the four learning modalities.The mean performance of studentsassigned in the different learningmodalities are not the same.There is a significant differenceamong the four learning modalities< PreviousContinue >II

The test is conducted to check whether there is a difference among the four learning modalities.

Answered: What is the null hypothesis? Select the…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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A manufacturer of automobiles finds that 15% of the cars are unfit for delivery when they come off theassembly line. A worker proposes a new assembly technique which he claims will reduce the percentage ofunfit cars. His technique is tried on 80 randomly chosen cars. It turns out that 3 are defective.Test at α = 0.05. Show all seven steps to receive full credit.
Ackerman and Goldsmith (2011) report that students who study from a screen (phone, tablet, or computer) tended to have lower quiz scores than students who studied the same material from printed pages. To test this finding, a professor identifies a sample of n = 16 students who used the electronic version of the course textbook and determines that this sample had an average score of M = 72.5 on the final exam. During the previous three years, the final exam scores for the general population of students taking the course averaged μ =77with a standard deviation of σ = 8 and formed a roughly normal distribution. The professor would like to use the sample to determine whether students studying from an electronic screen had exam scores that are significantly different from those for the general population. 1. Using the standard four-step procedure, conduct a two-tailed hypothesis test with αto evaluate the effect of studying from an electronic screen.
A research center claims that at least 28% of adults in a certain country think that their taxes will be audited. In a random sample of1000 adults in that country in a recent year, 23%say they are concerned that their taxes will be audited. At α=0.10, is there enough evidence to reject the center's claim? Complete parts (a) through (e) below. (a) Identify the claim and state H0 and Ha. Identify the claim in this scenario. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) A. nothing% of adults in the country think that their taxes will be audited. B. Less than nothing% of adults in the country think that their taxes will be audited. C. At least nothing% of adults in the country think that their taxes will be audited. D. The percentage of adults in the country who think that their taxes will be audited is not nothing%. Let p be the population proportion of…
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According to a local chamber of commerce, in 1993, 5.9% of local area residents owned more than five cars. A local car dealer claims that the percentage has increased. He randomly selects 180 local area residents and finds that 12 of them own more than five cars. Test this car dealer's claim at the level of significance of 0.05.
Researchers investigated the possible beneficial effect on heart health of crinking black tea and whether adding mikk to the tea reduces any possible benefit Tiventy-four volunteers Were randomly assigned to one of three groups Every day for month; participants in group drank twvo cups ofhot black tea without mikk; participants in group drank two cups of hot black tea with milk; and participants in group drank twvo cups ofhot water but no tea At the end of the month the fesearchers measured the change in each of the participants heart health. Is it reasonable to zeneralize the study beyond the 24 participants? Explain why or why not.
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A research center claims that at least 31% of adults in a certain country think that their taxes will be audited. In a random sample of 800 adults in that country in a recent year, 26% say they are concerned that their taxes will be audited. At α=0.10, is there enough evidence to reject the center's claim? Complete parts (a) through (e) below. (a) Identify the claim and state H0 and Ha. Identify the claim in this scenario. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) A. The percentage of adults in the country who think that their taxes will be audited is not enter your response here%. B. enter your response here% of adults in the country think that their taxes will be audited. C. Less than enter your response here% of adults in the country think that their taxes will be audited. D. At least enter your response here% of adults in the country think…

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