I want to test whether there is a significant association between drinking coffee or caffein before school and whether it helps with my grades. I am using a test of association hypothesis. (I posted a picture of my results) My question is what would the null and alternative hypothesis be? Ho: H1

I want to test whether there is a significant association between drinking coffee or caffein before school and whether it helps with my grades. I am using a test of association hypothesis. (I posted a picture of my results) My question is what would the null and alternative hypothesis be? Ho: H1

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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A research company wants to determine whether there is a difference in effectiveness of a brand- name ibuprofen and generic ibuprofen. What are the appropriate hypotheses for this testing scenario? Let µ equal the mean of the effectiveness of brand-name ibuprofen and µ2 equal the mean of the effectiveness of generic ibuprofen. O Ho: H1 - H2 = 0 Hạ: H1 - H2 > 0 O Ho: H1 - µ2 = 0 Hạ: H1 - H2 0 O Ho: X1 - X2 = 0 Hạ: X1 - X2 + 0
Would you please help with this follow-up question too? Thank you “We have (i) (no / weak / strong / very strong) evidence to conclude that there is an associationbetweenthetwovariablesinthestudy.Fromthe ?2-test,itisfoundthatadults in higher secondary level are more likely to have (ii) (normal / moderate / severe) stress level, but less likely to have (iii) (normal / moderate / severe) stress level. Also, adults in (iv) (secondary / undergraduate / postgraduate) level are (v) (more / less) likely to have normal stress level, but less likely to have (vi) (moderate / severe) stress level.”
Using image attached A. Fill in blanks B. What are the null and alternative hypothesis? C. Find the test statistic, z0 D. Find the P-Value
II - A researcher wants to know if the attitude of EEU students is dependent on his/her order of birth. Test the hypothesis at 0.05 level of significance. The data are follows. Tabular value base from Degree of Freedom is 9.35 Age Aggressive Passive In - Between Total Eldest 49 25 38 Middle 42 30 26 Youngest Total 23 43 37 Ho: There is no significant effect of the birth of order to their attitude. Ha: There is significant effect of the birth of order to their attitude. Solutions:
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Pain medications sometimes come with side effects. One side effect is dizziness. A researcher wanted to determine if some pain medications produced more or less dizziness than others. The results from his study are shown in the table below. Use a test to determine if the proportion of people within each treatment group who experienced dizziness are the same at the α= .01 level of significance. Tordol Placebo Naproxen Tylenol Advil Dizziness 83 32 36 5 8 No dizziness 4063 1832 1330 382 337 1) Determine the null and alternative hypotheses. Select the correct pair. Ho: The proportion of people within each treatment group who experienced dizziness are the sameHa: The proportion of people within each treatment group who experienced dizziness are different Ho:The proportion of people within each treatment group who experienced dizziness are independentHa:The proportion of people within each treatment group who experienced dizziness are dependent 2) Determine the…
Mike would like to find out if a new intervention would increase the motivation to study chemistry in high school students. He recruits 40 high schoolers and gives the intervention to 20 of the students. He then measures attitudes towards studying chemistry in all the students and compares the results for the students who got the intervention with the students who did not. Mike's study... A. Has a non-directional hypothesis and should be tested with a dependent samples t- test B. Has a non-directional hypothesis and should be tested with an independent samples t-test C. Has a directional hypothesis and should be tested with an independent samples t-test D. Has a directional hypothesis and should be tested with an dependent samples t-test
Test the claim that the proportion of people who own cats is significantly different than 80% at the 0.1 significance level. The alternative hypothesis would be: p 0.8 u > 0.8 µ < 0.8 p # 0.8 µ # 0.8 o The test is: left-tailed two-tailed right-tailed Based on a sample of 500 people, 75% owned cats The test statistic is: (to 2 decimals) The p-value is: (to 2 decimals)
Exercise 2: The school board of Two Guns, Texas is deeply concerned that their public school teachers are quitting their jobs and accepting teaching positions in other parts of the state. Some members of the school board think that the reason why teachers are quitting is because their weekly salaries are lower than those offered by other school boards in the state. The school board hires you to conduct a significance test. The research question: Do teachers in other parts of Texas earn higher average weekly salaries than those working in the Two Guns school district? There is no estimate of the population standard deviations. The significance level will be set at 5%. Step 1: Test Set-up Question 1: How large a sample is needed to achieve 80% statistical power? Based on past research Cohen's d effect size is estimated at 0.40, which is a small effect. See the table below: Cohen's d ES Thresholds Small 0.2 Medium 0.5 Large 0.8 Here are the results of an a priori power analysis run using…
The following table contains the number of successes and failures for three categories of a variable. Test whether the proportions are equal for each category at the a 0.1 level of significance. Category 1 Category 2 Category 3 Failures 84 34 48 Successes 65 72 62 State the hypotheses Choose the correct answer below. A H The categories of the variable and success and failure are dependent. H, The categories of the variable and success and failure are independent. B H PP2"P3 H, At least one of the proportions is different from the others. He The categories of the variable and success and failure are independent. H, The categories of the variable and success and failure are dependent. D. Ho H=E, and u, =E, and ua =E H, At least one mean is different from what is expected What is the P-value? (Round to three decimal places as needed.)
Test the claim that the mean GPA of night students is significantly different than 2.6 at the 0.05 significance level. The null and alternative hypothesis would be: Но: д — 2.6 Нo:р 3 0.65 Но: р %—D 0.65 Но:н H:р > 2.6 Н:p#0.65 Hi:p > 0.65 Н:д < 2.6 H:д 2 2.6 H:р<0.65 - 2.6 Ho:µ 2.6 Но:р 0.65 = = The test is: right-tailed left-tailed two-tailed Based on a sample of 65 people, the sample mean GPA was 2.63 with a standard deviation of 0.05 The test statistic i: (to 2 decimals) The positive critical value is: (to 2 decimals) Based on this we: O Fail to reject the null hypothesis O Reject the null hypothesis
A researcher, working for a large pharmaceutical company, is interested in testing the claim that less than 24% of people who take a new sinus medication receive symptom relief in less than 15 minutes. To test this claim, the researcher collects the following data on a sample of 500 adults and 110 of them receive symptom relief in less than 15 minutes after taking the medication. The following is the data from this study: Sample size =500 adults The alternative hypothesis is Ha:p<0.24 The test statistic is calculated as z0=−1.05. Find and interpret the p− value for this hypothesis test. Use the curve below to help visualize your answer. Select the appropriate test by dragging the blue point to a right-, left- or two-tailed diagram, then set the test statistic on the x-axis to find the p-value. Based on the p-value, choose the correct interpretation. Move the blue dot to choose the appropriate test