Question 3: give the test statistic. A statistician wants to compare the average grade between students thatenroll with a support course in a statistics class versus those that do not.A sample of 37 students enrolled in a support course has an averagegrade of 84% with a standard deviation of 20%. A sample of 100students not enrolled in a support course have an average grade of 79%with a standard deviation of 27%. Both grade distributions are normallydistributed. Take population 1 as students who enroll in a supportcourse. At the 5% significance level determine if the average grade ofstudents in a support course is higher than those that do not enroll in asupport course. Give the test statistic.t = 1.18z 1.18t 1.66z = 1.66

Given that : For sample 1 ( support the course) n1 = 37 X bar1 = 84% = 0.84 Sigma1 = 20% = 0.20…

Answered: A statistician wants to compare the…

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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You want to compare differences in prior arrests across ethnicity in your study, you measured ethnicity as white =0 black =1 hispanic=2, and other =3. Prior arrests was recorded as the number of prior arrests. which test would you perform to see if arrests differ across diffrent ethnic categories? A. ANOVA B. T-test
The test for the equality of two population variances is based on which of the following? a The ratio of the two sample variances. b The difference between the two population variances. c The difference between the two sample variances. d The ratio of the population variances to the sample variances.
Micah is interested in testing whether college students' levels of gratitude change over the course of the semester. He randomly selects a sample of 100 students and assesses their levels of gratitude at the beginning, and end of the semester. Question 17 options: ANOVA Paired samples t test Independent samples t test Correlation
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A study was conducted to examine the impact of speaking in public on college students. A class of 15 students participated in the study. At the beginning of a lecture the students recorded their systolic blood pressure. During the lecture the instructor called on each student to stand and answer questions about topics in the lecture. After speaking the students once again recorded their blood pressure. The resulting values are given below along with summary statistics. We are interested if the blood pressure increased because of speaking. Provide the test statistic value in the box below. Use 3 decimal places. Mean SD Before 125.3 15.03 After 127.9 15.5 Difference (Before - After) -2.6 14.87
Question 3. A researcher wished to gauge public opinion on gun control. He randomly selected 1000 people from the list of registered voters and asked them the following question: Do you believe that gun control laws which restricts the ability of Ghanaians to protect their families should be eliminated? i. Identify the two instances of inappropriate use of statistics in the approach used by the researcher. ii. Suggest a remedy for improving the approach used by the researcher.
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Write up your results as you would see them in a research paper. Be sure that you include the means and standard deviations for each group in your write-up, as well as a sentence or two explaining the results
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