nfidence interval for the value of the parameter. A sample of 10 Latin American countries was obtained to find out what is invested in sports, that is, in promoting h performance, infrastructure, physical activity programs, promotion, salaries and scholarships. The information in lions of dollars is as follows: 30.3, 842.4, 213, 169.3, 62.1, 52.5, 233, 65.3, 32.8, 50.2. Based on this information, uld you ensure that the variance with respect to the average investment is greater than 60,516 million dollars? Use ha=5%.
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- A school administrator wants to determine the number of seniors who drive to school at least 3 days per week. Out of the 420 seniors, she randomly chooses 30 of them,and she asks each if they drive to school at least 3 days per week. A total of 18 of them, which is 60%, respond yes. Identify the population Identify the sample. Is the value 60% a statistic or a parameter? Defend your answer. Is the administrator certain that 60% of all seniors drive to school at least 3 days per week? Why or why not?Do the states that voted for McCain have a different average percent of heavy drinkers than the states that voted for Obama in the 2008 election? 1. To answer the question of whether McCain states and Obama states have different average percent, heavy drinkers, we will use a 2 sample t-test. Why? 2. What should the hypotheses be for this test?A SAMPLE OF EMPLOYEES IS SELECTED AND IT IS FOUND THAT 50% OWN COMPUTER. iS THIS A PARAMETER OF STATISTIC AND WHY?a SAMPLE OF SENIORS IS SELECTED AND IT IS FOUND THAT 50% OWN A CAR> iS THIS A STATISTIC OR PARAMETER AND WHY?
- In Exercises 5–20, conduct the hypothesis test and provide the test statistic and the P-value and/or critical value, and state the conclusion. Bias in Clinical Trials? Researchers investigated the issue of race and equality of access to clinical trials. The following table shows the population distribution and the numbers of participants in clinical trials involving lung cancer (based on data from “Participation in Cancer Clinical Trials,” by Murthy, Krumholz, and Gross, Journal of the American Medical Association, Vol. 291, No. 22). Use a 0.01 significance level to test the claim that the distribution of clinical trial participants fits well with the population distribution. Is there a race/ethnic group that appears to be very underrepresented?In Exercises 9–16, (a) write the claim mathematically andidentify and (b) find the critical value(s) and identify the rejectionregion(s), (c) find the standardized test statistic z, (d) decide whether to reject orfail to reject the null hypothesis, and (e) interpret the decision in the context of theoriginal claim. If convenient, use technology to find the standardized test statistic. A research center claims that at least 40% of U.S. adults think the Census count is accurate. In a random sample of 600 U.S. adults, 35% say that the Census count is accurate. At ⍶ = 0.02 is there enough evidence to reject the center’s claim?A pollof 2000 randomly selected students in grades 6 through 8 was conducted and found that 48% enjoy playing sports. Is the 48% result a statistic or a parameter?
- The article “Evaluation of Criteria for Setting Speed Limits on Gravel Roads” (S. Dissanayake, Journal of Transportation Engineering, 2011:57–63) measured speeds of vehicles on several roads in the state of Kansas. On South Cedar Niles, 73 vehicles were observed, and 49 of them were exceeding the speed limit. Can you conclude that more than 60% of the vehicles on South Cedar Niles exceed the speed limit?Decide whether the following results from a statistical study represent a sample statistic or a population parameter After the presentation by the United way representative, 67 of the night’s 300+ attendees were interviewed about their reaction. Of the 67 people interviewed 79% said they were motivated to donate more of their time and/or money to helping nonprofit organizations.Which of the elements of a test of hypothesis can and should be specified prior to analyzing the data that are to be used to conduct the test?
- A research team is hired to investigate the prevalence of periodontal disease in a rural countywith a low average socio-economic status. The team is given the task of surveying the area, andproviding a brief examination of participants to correctly identify cases of periodontal diseaseand estimate an overall prevalence. If the team identifies an overall prevalence of above 25%, thesponsoring organization is to initiate an active campaign promoting healthy dental practice. Outof 2,879 participants surveyed, 589 were identified to have periodontal disease. A) Conduct a formal test for detecting if the prevalence of periodontal disease in the sample issignificantly different from the minimum prevalence for intervention. Use an alpha level of 0.01.B) Interpret your conclusions.a) A small-town mechanic says that 8% his customers come in for an oil change. When 1000 samples were drawn from his records, it was found that 6.5% of these came in for an oil change. What is the target population? Does the value 8% refer to the parameter or to the statistic? Is the value 6.5% a parameter or a statistic? c) State which sampling method used in the following scenarios Select the first 19 customers who enter building. Select 40 students in each district in proportion of how many students are in each district. Randomly select 30 customers by assigning each customer a number, then selecting customers based on which number appears in a random numbers table. Take note of every fifth car passing over a bridge. d) State one similarity and one difference between quota sampling and stratified random sampling.c please survey of 1000 adults from a certain region asked, "If purchasing a used car made certain upgrades or features more affordable, what would be your preferred luxury upgrade?" The results indicated that 58% of the females and 51% of the males answered window tinting. The sample sizes of males and females were not provided. Suppose that of 600 females, 348 reported window tinting as their preferred luxury upgrade of choice, while of 400 males, 204 reported window tinting as their preferred luxury upgrade of choice. Complete parts (a) through (d) below. a. Is there evidence of a difference between males and females in the proportion who said they prefer window tinting as a luxury upgrade at the 0.05 level of significance? State the null and alternative hypotheses, where π1 is the population proportion of females who said they prefer window tinting as a luxury upgrade and π2 is the population proportion of males who said they prefer window tinting as a…