A survey was conducted on individual's awareness of prison conditions. The researcher wanted to know if Democrats or Republicans were more aware of the poor prisonconditions in their local prison. Using the data collected, test the difference between the means. What is the obtained test statistic, the degrees of freedom and the criticaltest statistic? Given the results would you accept or reject the null hypothesis at the .05 alpha level?DemocratsN = 50mean = 6.0standard dev. = 1.2Edit View Insert Forma12pt ✓RepublicansN = 40mean = 4.9standard dev. = 1.4TableToくくくくく田くBIU Αν ανParagraph√xwwww<>

N1=50,N2=40,X1¯=6,X2¯=4.9,s1=1.2,s2=1.4,α=0.05

Answered: conditions in their local prison. Using…

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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In a sample of 150 hospital emergency admissions with a certain diagnosis, 128 listed vomiting as a presenting symptom. Do these data provide sufficient evidence to indicate, at the 0.01 level ofsignificance, that the population proportion is less than 0.92? What is the null hypothesis? What is the test statistic? What is the p-value? What is the conclusion?
For a sample of 400 correctional officers at Lucasville State Prison, a researcher believes there is a relationship between “years on the job” and “willingness to help raise money for adult charities.” Using the following data, test the null hypothesis at the .01 level of significance that willingness to help raise donations does not differ by length of service as a correctional officer. In so doing, identify: (1) the research and null hypothesis, (2) the critical value needed to reject the null, (3) the decision that you made upon analyzing the data, and (4) the conclusion you have drawn based on the decision you have made.
there is 0.01 and 0.05 alpha level, what is the critical cutoff z scores for both? which one is easier to reject the null hypothesis and why?
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An ice-cream manufacturer asked you to determine if a person's choice of ice-cream flavour is dependent on age variability. To do this, you conduct a Chi-square hypothesis test with a calculated test statistic of 12.1812 and a critical value of 15.057 at a 5% significance level. Using the information provided, how would you advise the ice-cream manufacturer? Choosen one: A. Reject the null hypothesis, ice-cream choice does not depend on age variability. B. Do not reject the null hypothesis, ice-cream choice depends on age variability. C. Reject the null hypothesis, ice-cream choice depends on age variability. D. Do not reject the null hypothesis, ice-cream choice does not depend on age variability
A researcher wants to know if a treatment significantly changes the wellbeing of someone with depression. The average person with depression scores a 7.2 on a wellbeing scale with a SD of 1.4 points. The researcher administers the treatment to 25 clients for a month and finds their wellbeing at the end to be 7.7. Assume an alpha level of .05. How do we interpret this effect size? Would we reject the null hypothesis if the test was nondirectional(two-tailed)? Would we reject the null hypothesis if the alpha level was .01 (directional/one-tailed)?
An RA at the University of Baltimore has concluded that the difference between the mean GPA scores of Senior and junior is statistically significant, when in fact the null hypothesis of no difference is true. What type of error has he committed?
A study of color in tiger beetles is conducted to support the contention that the proportion of black beetles may vary from locality to locality (alpha=0.05). A sample of 500 beetles caught in one season near Providence, Rhode Island, yielded 95 black beetles. A catch of 112 beetles from Aqueduct, New York, contained 17 black individuals. 1. What is null and alternative hypothesis? 2. What proportions did you observe in the two localities? 3. What is the null standard error for the difference? 4. Calculate the appropriate test statistic. 5. What p-value do you associate with that statistic? 6. What do you conclude about the proportion of black beetles in the two locations?
Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 34 of the 39 subjects treated with echinacea developed rhinovirus infections. In a placebo group, 98 of the 115 subjects developed rhinovirus infections. Use a 0.05 significance level to test the claim that echinacea has an effect on rhinovirus infections. Complete parts (a) through (c) below. Identify the test statistic:Z= ___?____ Identify the P-Value: _______State the conclusion about the null hypothesis, as well as the final conclusion that addresses the original claim. _________Identify the confidence interval limits for the appropriate confidence interval.__?____ < P1-P2 < __?____
Give the null and alternative hypothesis of The following are the laboratory results in hemoglobin of 10 male (X1) and 10 female(X2) patients. Test the null hypothesis that there is no significant difference between the hemoglobin of male and female patients. Use the t -test at 0.05 level of significance. As part of the National Health Survey conducted by the Department of Health and Human Services, perceptions on the attitude and practices of vaccine were obtained for females aged 18-30 before and after intervention. Listed below are sample mean results. Is there sufficient evidence to support the claim that there is a difference in the attitude and practice between before and after intervention? Use a 0.05 significance level. A researcher determines the BMI index of geriatrics from Tondo. Using 0.05 level of significance, is the BMI index of geriatrics are within the accepted norm (21)?
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Using a "Sample Size" of 5 and an "Effect size" of 1 and an alpha (significance) of .05, what is the probability, rounded to two decimal places) of failing to reject the null, when the null is in fact false (one-tailed test)?

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