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.
Exercises 17–20 are based on data sets included in Appendix B. The complete data sets can be found at www.TriolaSlats.com.
17. Admissions for Birth Data Set 4 “Births” includes the days of the weeks that prospective mothers were admitted to a hospital to give birth. A physician claims that because many births are induced or involve cesarean section, they are scheduled for days other than Saturday or Sunday, so births do not occur on the seven different days of the week with equal frequency. Use a 0.01 significance level to test that claim.
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- 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?arrow_forwardExercises 1–5 refer to the sample data in the following table, which summarizes the last digits of the heights (cm) of 300 randomly selected subjects (from Data Set 1 “Body Data” in Appendix B). Assume that we want to use a 0.05 significance level to test the claim that the data are from a population having the property that the last digits are all equally likely. What are the null and alternative hypotheses corresponding to the stated claim?arrow_forwardI need help identifying the p- value of this hypothesis testarrow_forward
- At the 5% significance level, does it appear that price of bus trips per week, population or average rate to park your personal vehicle can be removed from the model as unnecessary? In responding, construct and test any appropriate hypothesis.arrow_forwardIn Exercises 1–5, use the following survey results: Randomly selected subjects were asked if they were aware that the Earth has lost half of its wildlife population during the past 50 years. Among 1121 women, 23% said that they were aware. Among 1084 men, 26% said that they were aware (based on data from a Harris poll). Biodiversity Identify the null and alternative hypotheses resulting from the claim that for the people who were aware of the statement, the proportion of women is equal to the proportion of men.arrow_forwardWhat is step 5 of hypothesis testing ?arrow_forward
- Utilizing the previous table: A sample of 25 cities have been classified as high or low on their homicide rates and on the number of handguns sold within the city limits. Was the null hypothesis rejected or accepted?arrow_forwardCan you help me determine the test statistic, the P-value, and the conclusion for this hypothesis test?arrow_forwardUse the calculator to conduct a hypothesis test for the percentage of women who are in the directory. (Stage 1).Should you reject the claim? What is the level of significance? (Hint: 1-PropZTest)arrow_forward
- Exercises 1-5 refer to the sample data in the following table, which summarizes the last digits of the height cm of 300 randomly selected subjects (from data set 1 " body data"). Assume that we want to use a 0.05 significance level to test the claim that the data are from a population having the property that the last digits are all equally likely. 1-what are the null and alternative hypotheses corresponding to the stated claim? 2-when testing the claim in Exercise 1, what are the observed and expected frequencies for the last digit of 7? 3-is the hypothesis test left-tailed, right-taled, or two-tailed? 4-If using a 0.05 significance level to test the stated claim, find the number of degrees of freedom. 5-Given that the p-value for the hypothesis test is 0.501, what do you conclude? Does it appear that the height were obtained through measurement or that the subjects reported their heights? Last digit 0 1 2 3 4 5 6 7 8 9 Frequency 30 35 24 25 35 36 37 27 27 24arrow_forwardChoose one problem, formulate the null and alternative hypothesis.arrow_forward4. The National Institute of Mental Health published an article stating that in any one-year period, approximately 9.5 percent of American adults suffer from depression or a depressive illness. Suppose that in a survey of 100 people in a certain town, seven of them suffered from depression or a depressive illness. Conduct a hypothesis test to determine if the true proportion of people in that town suffering from depression or a depressive illness is lower than the percent in the general adult American population.arrow_forward
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