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- You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 33%. You would like to be 90% confident that your estimate is within 1% of the true population proportion. How large of a sample size is required? Hint: Video [+] n =Based on historical data in Oxnard college, we believe that 32% of freshmen do not visit their counselors regularly. For this year, you would like to obtain a new sample to estimate the proportiton of freshmen who do not visit their counselors regularly. You would like to be 90% confident that your estimate is within 2% of the true population proportion. How large of a sample size is required? Do not round mid-calculation.n =can you figure out part C?
- Use the five steps in hypothesis testing. 1. Agriculture: Ground Water Unfortunately, arsenic occurs naturally in some ground water (Reference: UnionCarbide Technical Report K/UR-1. A mean arsenic level of parts per billion (ppb) is considered safe foragricultural use. A well in Texas is used to water cotton crops. This well is tested on a regular basis for arsenic. Arandom sample of 37 tests gave a sample mean x̄ = 7.2 ppb arsenic, with s= 1.9 ppb. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use a= 0.01Instructor-created question E Question Help Course Note Packet Chapter 9 Page 8 and 10 How do professionals stay on top of their careers? Of 1,000 surveyed members of a business networking website, 580 reported that they engaged in professional networking within the last month. At the 0.01 level of significance, is there evidence that the proportion of all site members who engaged in professional networking within the last month is different from 55%? State the null and alternative hypotheses. Hn На Calculate the test statistic. ZSTAT =O (Type an integer or a decimal. Round to two decimal places as needed.) What is the p-value? The p-value is (Type an integer or a decimal. Round to three decimal places as needed.) State the conclusion of the test. V the null hypothesis. There is V evidence conclude that the proportion of all site members who engaged in professional networking within the last month is different from 55%.Approximately 58% of all people are able to wink with both eyes. Is this percent different for people who wear glasses? A researcher tests 319 people who wear glasses and found that 204 could wink with both eyes. What can be concluded at the αα = 0.05 level of significance? For this study, we should use Select an answer z-test for the difference between two population proportions t-test for a population mean z-test for a population proportion t-test for the difference between two dependent population means t-test for the difference between two independent population means The null and alternative hypotheses would be: H0:H0: Select an answer μd p1 p μ1 μ Select an answer ≥ = ≠ ≤ H1:H1: Select an answer μ μ1 p p1 μd Select an answer < ≠ > = The test statistic ? z t = (round to 3 decimal places) The p-value = (round to 4 decimal places) The p-value is ? > ≤ αα. Based on this, we should Select an answer accept reject fail to reject the null hypothesis. Explain…
- The average starting salary of students who graduated from colleges of Business in 2009 was $48,400.A sample of 100 graduates in 2010 showed an average starting salary of $50,000. Assume the standarddeviation of the population is known to be $8000. We want to determine whether or not there hasbeen a significant increase in the starting salaries.Step 1. Statement of the hypothesis Step 2. Standardized test statistic formula Step 3. State the level of significance Step 4. Decision Rule (Draw a bell to show rejection zone) Step 5. Calculation of the statistic Step 6. ConclusionThe Kyoto Protocol was signed in 1997, and required countries to start reducing their carbon emissions. The protocol became enforceable in February 2005. In 2004, the mean Co2 emission was 4.87 metric tons per capita. In 2010, the CO2 emissions for a random sample of 44 countries were collected. Is there enough evidence to show that the mean Co2 emission is higher in 2010 than in 2004? State the random variable, population parameter, and hypotheses. a. The symbol for the random variable involved in this problem is ? v b. The wording for the random variable in context is as follows: Select an answer c. The symbol for the parameter involved in this problem is ? v d. The wording for the parameter in context is as follows: Select an answer e. Fill in the correct null and alternative hypotheses: Но: ? HA: f. A Type I error in the context of this problem would be Select an answer g. A Type Il error in the context of this problem would be Select an answerIn a sample of 40 people 65% are black. Test the null hypothesis that the population proportion of black = 0.4 against the alternative hypothesis that proportion is not equal to 0.4. Find the p-value. O A. 0.0578 O B.0.0012 OC.0.5271 O D. 0.2059