A researcher wondered if attainment within six years among students who receive grants as sart of their educational funding (Group 1) was lower than attainment within six yearsamong students who did not receive grants as part of their educational funding (Group 2). Atainment is defined as whether the student earned the degree or certificate that heishe setout to eam upon enrolment. Complete parts (a) through (c) below.A. 21Cannot be determined(c) In part (b), we learned that two groups (students who receive grants and students who do not receive grants) are being compared. In addition, the sampling method isindependent. State the null and altemative hypotheses for this testHg.

Given : A researcher wondered if attainment within six years among students who receive grants as…

Answered: G. Cannot be determined (c) In part…

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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6) In an exit poll, 42 of 75 men sampled supported a ballot initiative to raise the local sales tax to build a new football stadium. In the same poll, 41 of 85 women sampled supported the initiative. Find and interpret the p-value for the test of hypothesis that the proportions of men and women who support the initiative are different.
The local swim team is considering offering a new semi-private class aimed at entry-level swimmers, but needs at minimum number of swimmers to sign up in order to be cost effective. Last year’s data showed that during 8 swim sessions the average number of entry-level swimmers attending was 15. Suppose the instructor wants to conduct a hypothesis test. The alternative hypothesis for this hypothesis test is: "the population mean is less than 15". The sample size is 8, σ is known, and alpha =.05, the critical value of z is?
An exit poll of 1000 randomly selected voters found that 535 favored candidate A. Is the race too close to call? Answer this question by performing an appropriate test of hypothesis at 5% level of significance.
a) Which of the following correctly specifies the null hypothesis? [select all that apply] b) Which of the following correctly specifies the alternative hypothesis? [select all that apply] c) Calculate and report the standard error for the sampling distribution for the difference in means.
Health researchers wish to compare the efficacy of the Moderna vs. Pfizer Vaccine. Here are 4 possible reasons that it would not make sense to run a matched pair experiment for such a study. Pick the TWO that are correct. 1: You would not be able to find twins willing to be part of such an experiment 2: You could not get two large independent samples for the purposes of comparison. 3: It would be hard to match two people for this test, since researchers do not yet understand what individual factors contribute to the variation of immunity to this disease. 4: It would make no sense to test both vaccines on one person and compare the outcomes. The two that are correct are: Oa. 1 and 4 The two that are correct are: 1 and 3 Ob. The two that are correct are: O c. 1 and 4 The two that are correct are: O d. 2 and 3 The two that are correct are: 3 and 4 O e.
You work for a marketing firm that has a large client in the automobile industry. You have been asked to estimate the proportion of households in Chicago that have two or more vehicles. You have been assigned to gather a random sample that could be used to estimate this proportion to within a 0.035 margin of error at a 99% level of confidence. a) With no prior research, what sample size should you gather in order to obtain a 0.035 margin of error? b) Your firm has decided that your plan is too expensive, and they wish to reduce the sample size required. You conduct a small preliminary sample, and you obtain a sample proportion of ˆp=0.185. Using this new information. what sample size should you gather in order to obtain a 0.035 margin of error
2. Several years ago, a census of all students enrolled at a large undergraduate university revealed that 19% of the students were seniors, 23% were juniors, 27% were sophomores, and 31% were freshmen. This year, the student senate did a survey to see whether these percentages have remained the same. A random sample of 200 students included 50 senior, 46 juniors, 55 sophomores, and 49 freshmen. Using a 2.5% significance level, test the null hypothesis that the percentages are still 19% seniors, 23% juniors, 27% sophomores, and 31% freshmen. Use the Critical Value Approach.
A student organization reports that, of a random sample of 300 college undergraduates, 95% attend all their classes during the first week of the semester and 15% did not attend all their classes during the first week. We know there is a mistake in this report because O A stratified sample would have been less prone to error O It's very unlikely that 15% of students didn't attend all their classes during the first week O There is always a possibility of response bias O 95% plus 15% adds up to more than 100%
An independent researcher was assigned to study work satisfaction of Saint Louis University employees. Given that she knows some employees at SLU, she immediately went to them and forced them to join the study. Some employees expressed interest in joining the research; but since she did not personally know them, she refused to let them participate. Which principle is violated? * Random sampling Size of the sample Distribution pattern O Homogeneity
Asap,
The business college computing center wants to determine the proportions of business students who have pesonal computers (PC's) at home. If the proportions differs from 30%, then the lab will modify a proposed enlargement of its facilities. Suppose a hypothesis test is conducted test is conducted and the test statistic is 2.74. Find the P-value for a test of hypothesis.
To apply the two-sample t procedures, use Option 1 if you have technology that implements that method. Otherwise, use Option 2. Researchers gave 40 index cards to a waitress at an Italian restaurant in New Jersey. Before delivering the bill to each customer, the waitress randomly selected a card and wrote on the bill the same message that was printed on the index card. Twenty of the cards had the message "The weather is supposed to be really good tomorrow. I hope you enjoy the day!" Another 20 cards contained the message "The weather is supposed to be not so good tomorrow. I hope you enjoy the day anyway!" After the customers left, the waitress recorded the amount of the tip (percent of bill) before taxes. Here are the tips for those receiving the good-weather message. 21.0 18.8 20.3 20.9 21.9 23.7 22.8 25.2 22.7 20.8 25.1 22.3 27.3 21.0 22.5 24.2 21.3 22.3 22.0 23.2 The tips for the 20 customers who received the bad-weather message are below. 19.3 18.8 16.1 17.1 14.4 18.0 19.1 19.4…

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G. Cannot be determined (c) In part (b), we learned that two groups (students who receive grants and students who do not receive grants) are being ocompared. In addilion, the sampling method is independent. State the null and altemative hypotheses for this test.