What are the possible outcomes in testing a hypothesis? What are the determinant factors in deciding the critical value(s) in testing a hypothesis?
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What are the possible outcomes in testing a hypothesis? What are the determinant factors in deciding the critical value(s) in testing a hypothesis?
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- Scenario: A researcher wants to study the effects of childhood stress, genetics, and their interaction for predicting aggression in adults. The researcher recruited 40 subjects, 20 reported they had no childhood stress and 20 reported they experienced severe childhood stress. The researcher is specifically interested in looking at the MAOA gene, because different versions of this gene are linked to aggression. The researcher conducts a genetic test and finds that half of subjects in each group have a gene for low MAOA activity and the other half have the gene for high MAOA activity. The researchers have the subjects self-rate their aggressive behavior over the last 6 months. 1. Given the scenario above, what are the null and alternative hypotheses? 2. Experimental design:a. What are the independent and dependent variables in this study? b. How many levels of each independent variable are there? c. What type of factorial ANOVA is this?A study investigates the effects of a Method's course and sex of student on willingness to believe in ESP ten years after college. This study has: two independent variables two dependent variables O two cells in its design two possible interactions to evaluateThe manager of Gilley’s Ice Cream Parlor needs an accurate forecast of the demand for ice cream. The store orders ice cream from a distributor a week ahead; if the store orders too little, it loses business, and if it orders too much, the extra must be thrown away. The manager believes that a major determinant of ice cream sales is temperature (i.e., the hotter the weather, the more ice cream people buy). Using an almanac, the manager has determined the average daytime temperature for 10 weeks, selected at random, and from store records he has determined the ice cream consumption for the same 10 weeks. These data are summarized as follows: a. Develop a linear regression model for these data and forecast the ice cream consumption if the average weekly daytime temperature is expected to be 85 degrees. b. Determine the strength of the linear relationship between temperature and ice cream consumption by using correlation.
- Example 4.7 Out of 1800 candidates appeared for a competitive examination 625 were successful; 300 had attended a coaching class and of these 180 came out successful. Test for the association of attributes attending the coaching class and success in the examination.Teaching Duties. Contingent faculty members in higher education are non-tenure track faculty, adjuncts, postdocs, lecturers, or instructors. R. Bowden and L. Gonzalez researched whether contingent faculty members are different from tenure-track faculty members with regards to teaching, research, and service in the article “The Rise of Contingent Faculty: Its Impact on the Professoriate and Higher Education” (Journal of Applied Research in Higher Education, Vol. 4, No. 1, pp. 5–22). A hypothesis test was conducted to decide whether the mean number of classes taught for credit per semester was less for contingent faculty than for tenure-track faculty. a. identify the variable. b. identify the two populations. c. determine the null and alternative hypotheses. d. classify the hypothesis test as two tailed, left tailed, or right tailed.7-1 #9 Gas, Charcoal, or Wood Pellets? A consumer research organization1 had 114 staffers taste chicken that had been cooked on grills heated by gas, charcoal, and wood pellets. They report that 41 of them (36%) preferred the gas grilled chicken, 39 (34%) picked charcoal, and the remaining 34 (30%) went with wood pellets. Does this information provide enough evidence to conclude that one type of grill heat is preferred over another?4 “Which Grill Makes the Tastiest Food?”, Consumer Reports, May 2020. What is the expected count for each cell? What is the chi-square statistic? (round to two decimal places)What is the p-value? (round to three decimal places)Choose the right conclusion from the following list:A. Do not reject H0. No evidence that one type is preferred over another.B. Do not reject H0. We have evidence that one type is preferred over another.C. Reject H0. No evidence that one type is preferred over another.D. Reject H0. We have evidence that one type is preferred over…
- A tenet of the scientific method is that -------------------------------allow researchers to examine mental processes and behavior in an empirical, scientific manner.Preventing heart attacks: Medical researchers performed a comparison of two drugs, clopidogrel and ticagrelor, which are designed to reduce the risk of heart attack or stroke in coronary patients. A total of 6663 patients were given clopidogrel, and 6740 were given ticagrelor. Of the clopidogrel patients, 654 suffered a heart attack or stroke within one year, and of the ticagrelor patients, 577 suffered a heart attack or stroke. Can you conclude that the proportion of patients suffering a heart attack or stroke differs between ticagrelor and clopidogrel? Let p, denote the proportion of patients suffering a heart attack or stroke with clopidogrel and p, denote the proportion of patients suffering a heart attack or stroke with ticagrelor. Use the a=0.01 level of significance and the P-value method with the TI-84 Plus calculator. Part 1 of 4 State the null and alternate hypotheses. Ho: H : This hypothesis test is a (Choose one) v test. Español Find the P-value. Round the answer to four…Subject Location Reading Math Science Is achieving a basic skill level related to the location of the school? The results of a random sample of students by the location of school and the number of students achieving basic skill levels in three subjects is shown in the contingency table. At a = 0.01, test the hypothesis that the variables are independent. Complete parts (a) through (d). Urban 48 41 39 Suburban 70 63 64 (a) Identify the claim and state the null and alternative hypotheses. Ho: Skill level in a subject is location. Ha: Skill level in a subject is location. The is the claim. (b) Calculate the test statistic. If convenient, use technology. %3D (Round to three decimal places as needed.) (c) Decide to reject or fail to reject the null hypothesis. Then interpret the decision in the context of the original claim. Choose the correct conclusion below. O A. Reject the null hypothesis. There is not enough evidence to reject the claim that skill level in a subject is independent of…
- Preventing heart attacks: Medical researchers performed a comparison of two drugs, clopidogrel and ticagrelor, which are designed to reduce the risk of heart attack or stroke in coronary patients. A total of 6728 patients were given clopidogrel, and 6678 were given ticagrelor. Of the clopidogrel patients, 573 suffered a heart attack or stroke within one year, and of the ticagrelor patients, 672 suffered a heart attack or stroke. Can you conclude that the proportion of patients suffering a heart attack or stroke is greater for ticagrelor? Let p₁ denote the proportion of patients suffering a heart attack or stroke with clopidogrel and p2 denote the proportion of patients suffering a heart attack or stroke with ticagrelor. Use the a= 0.05 level of significance and the P-value method with the TI-84 Plus calculator. Part: 0 / 4 Part 1 of 4 State the null and alternate hypotheses. Ho: H₁ : This hypothesis test is a (Choose one) ▼ test. OAutomobile racing, high-performance driving schools, and driver education programs run by automobile clubs continue to grow in popularity. All these activities require the participant to wear a helmet that is certified by the Snell Memorial Foundation, a not-for-profit organization dedicated to research, education, testing, and development of helmet safety standards. Snell “SA” (Sports Application) rated professional helmets are designed for auto racing and provide extreme impact resistance and high fire protection. One of the key factors in selecting a helmet is weight, since lower weight helmets tend to place less stress on the neck. The following data show the weight and price for 18 SA helmets (SoloRacer website). Helmet Weight (oz) Price ($) Pyrotect Pro Airflow 64 239 Pyrotect Pro Airflow Graphics 64 277 RCi Full Face 64 201 RaceQuip RidgeLine 64 203 HJC AR-10 58 291 HJC Si-12 47 699 HJC HX-10 49 890 Impact Racing Super Sport 59 346 Zamp FSA-1 66 202 Zamp…
