A researcher claims that a lesser proportion of construction companies in the eastern part use certified lumber in home construction than those in the western part. What are the null and the alternative hypotheses to check this claim

A researcher claims that a lesser proportion of construction companies in the eastern part use certified lumber in home construction than those in the western part. What are the null and the alternative hypotheses to check this claim

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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Are freshmen psychology majors less likely to change their major before they graduate compared to freshmen business majors? 379 of the 673 freshmen psychology majors from a recent study changed their major before they graduated and 458 of the 725 freshmen business majors changed their major before they graduated. What can be concluded at the = 0.05 level of significance? For this study, we should use Select an answer a. The null and alternative hypotheses would be: Ho: Select an answer H₁: Select an answer Select an answer Select an answer b. The test statistic ? C = Select an answer (please enter a decimal) Select an answer (Please enter a decimal) (please show your answer to 3 decimal places.) c. The p-value = d. The p-value is ? Q e. Based on this, we should Select an answer the null hypothesis. f. Thus, the final conclusion is that ... (Please show your answer to 4 decimal places.) O The results are statistically insignificant at a = 0.05, so there is insufficient evidence to…
A good research hypothesis should be… A. Unique in the literature B. Attention grabbing C. Testable and refutable D. Consistent with prevailing theories
b) An academic Professor conducted a research aimed at exploring the experience and challenges faced by people who are diagnosed with dementia and their families. If the professor perform a hypothesis test to decide whether the mean age of all people diagnosis with initial occurrence of dementia is less than 55 years old. Based on the statement, explain, what each of the following would mean. i) Type I error. ii) Correct decision. iii) Type II error.
8. It appears that there is some truth to the old adage “That which doesn’t kill us makes us stronger.” Seery, Holman, and Silver (2010) found that individuals with some history of adversity report better mental health and higher well-being compared to people with little or no history of adversity. In an attempt to examine this phenomenon, a researcher surveys a group of college students to determine the negative life events that they experienced in the past 5 years and their current feeling of well-being. For n = 18 participants with 2 or fewer negative experiences, the average well-being score is M = 42 with SS = 398, and for n = 16 participants with 5 to 10 negative experiences the average score is M = 48.6 with SS = 370. a. Is there a significant difference between the two populations represented by these two samples? Use a two-tailed test with α = .01. b. Compute Cohen’s d to measure the size of the effect. c. Write a sentence demonstrating how the outcome of the hypothesis test…
A sample of marriage licenses in St Lawrence County in Upstate New York gives theages of husbands and wives at the time of marriage for 105 newly married couples.The question of interest is whether or not husbands tend to be older than their wives.Use Statkey and statistical inference to address this issue based on the questionsbelow. In all cases be sure to interpret your findings in the context of this problem,stating to what population (if any) your findings apply.1) When getting married, is the average age for husbands greater than the averageage for wives? (Statkey: Use Descriptive Statistics for Two Quantitative Variables)2) Is the proportion of couples for which the husband is older greater than 50%?3) For any significant results, construct and interpret an interval for the size of theeffect. (Statkey: Use Confidence Interval for a Proportion)4) Do you expect the correlation between the ages at marriage of husbands andwives to be positive, negative, or near zero? Explain.5)…
Are there less children diagnosed with Autism Spectrum Disorder (ASD) in states that have larger urban areas over states that are mostly rural? Assume data were collected from a fairly urban state and they found 167 eight-year olds diagnosed with ASD out of 18922 eight-year olds evaluated. Assume data were then collected for a fairly rural state and they found 68 eight-year olds diagnosed with ASD out of 2989 eight-year olds evaluated. Is there enough evidence to show that the proportion of children diagnosed with ASD in the fairly urban state is lower than the proportion in the fairly rural state? Test at the 3% level and Compute a 94% confidence interval for the difference in proportions. (round to 3 decimal points)
A psychologist is investigating whether or not elderly people (age 60 to 70) have a different speaking speed in everyday conversation as compared to middle age people (age 20 to 40). The psychologist test 20-40 years old and 60-70 years old participants and determines speaking speed for each participant. Formulate in words the null and research hypotheses in the context of this study. The formulations should involve the dependent and independent variables used in the study. However, do not use the phrases “dependent variable” or “independent variable” as such. Do not use any mathematical symbols or expressions.
A researcher wants to know if people from different social classes (lower, working, middle, upper classes) vary in their support for same-sex marriage. The researcher measured the attitudes of people from different social classes toward same-sex marriage by asking if they think homosexuals should have right to marry (1=strongly disagree, 2=disagree, 3=agree, 4=strongly agree). The researcher hypothesized that social classes will vary significantly in their support for same-sex marriage. To test the hypothesis, the researcher conducted a one-way ANOVA and obtained the following results. ANOVA HOMOSEXUALS SHOULD HAVE RIGHT TO MARRY Sum of Squares df Mean Square F Sig. Between Groups 3.544 3 1.181 .496 .685 Within Groups 2202.349 924 2.383 Total 2205.892 927 Based on the results in the table above, can the researcher conclude that his hypothesis is supported and that there is a significant difference…
please help asap. data for the problem is provided in the picture as well.
If in general a reasearch question needs to be answered by using the null and alternative hypotheses correctly in words and statistical notations? How is it done?
29. The General Social Survey polled 1280 men and 1531 women to determine their level of education. The results are presented in the following table. Can you conclude that education level is independent of gender? Use ? = 0.01 level of significance. No High School Diploma High School Diploma Associate’s Degree Bachelor’s Degree Graduate Degree Men 178 608 96 248 150 Women 186 827 128 259 131 (a) State the hypotheses. (b) State the test statistic. (c) Calculate the P-value. (d) Make a decision. (e) State the conclusion addressing the original claim.
Suppose that you are curious to find out if there is any relationship between householdhead and employment status. Discuss why hypothesis test of means may not be useful to make inference in this case. Respondent Household head SEX AGE Hours worked per week Main type of work Length of time at job Years of secondary schooling Examination passed Employment Status Income 1 1 2 27 16 5 7 5 1 6 78000 2 2 1 24 40 5 5 3 99 3 78000 3 2 2 26 60 5 6 5 1 3 129996 4 2 1 46 40 4 7 5 1 3 78000 5 1 2 31 40 8 7 3 1 3 129996 6 1 1 48 24 4 7 3 1 3 46800 7 2 1 19 45 5 5 3 1 3 78000 8 1 2 63 16 6 7 3 1 6 46800 9 2 1 26 40 9 7 4 9 3 78000 10 1 2 38 40 7 2 5 1 6 360000 11 1 1 48 24 4 7 3 1 3 46800 12 2 1 19 45 5 5 3 1 3 78000 13 1 2 63 16 6 7 3 1 6 46800 14 2 1 26 40 9 7 4 9 3 78000 15 1 2 38 40 7 2 5 1 6 360000 16 2 1 19 40 4 4 5 3 3 78000 17 1 1 37 45 5 7 3 9 6 779948 18 2 1 40 40 9 7 4 9 3 78000 19 2 1 40 60 5 5 3 1 3 78000 20 1 1 28 40 2 5 5 8 3…