In a survey conducted by a website, employers were asked if they had ever sent an employee home because they were dressed inappropriately. A total of 2765 employers responded to the survey, with 964 saying that they had sent an employee home for inappropriate attire. In a press release, the website makes the claim that more than one-third of employers have sent an employee home to change clothes.   Do the sample data provide convincing evidence in support of this claim? Test the relevant hypotheses using  ? = 0.05.  For purposes of this exercise, assume that it is reasonable to regard the sample as representative of employers in the United States. (Round your test statistic to two decimal places and your P-value to four decimal places.) z  =    P-value  =    State your conclusion. Reject H0. We do not have convincing evidence that more than one-third of employers have sent an employee home to change clothes .Do not reject H0. We do not have convincing evidence that more than one-third of employers have sent an employee home to change clothes.     Reject H0. We have convincing evidence that more than one-third of employers have sent an employee home to change clothes. Do not reject H0. We have convincing evidence that more than one-third of employers have sent an employee home to change clothes

If a hurricane was headed your way, would you evacuate? The headline of a press release states, "Thirty-five Percent of People on High-Risk Coast Will Refuse Evacuation Order, Survey of Hurricane Preparedness Finds." This headline was based on a survey of 4,140 adults who live within 20 miles of the coast in high hurricane risk counties of eight southern states. In selecting the sample, care was taken to ensure that the sample would be representative of the population of coastal residents in these states.   (a) Use this information to estimate the proportion of coastal residents who would evacuate using a 98% confidence interval. (Round your answers to three decimal places.)     ,     (b) Write a few sentences interpreting the interval and the confidence level associated with the interval. Our estimate of the proportion of all coastal residents who( would, would not    )evacuate is within the confidence interval above. We are not 100% sure the true proportion is…

A nonprofit organization conducted a survey of 2110 metropolitan-area teachers regarding their beliefs about educational problems. The following data were obtained: 860 said that lack of parental support is a problem. 880 said that abused or neglected children are problems. 660 said that malnutrition or students in poor health is a problem. 100 said that lack of parental support and abused or neglected children are problems. 90 said that lack of parental support and malnutrition or poor health are problems. 130 said that abused or neglected children and malnutrition or poor health are problems. 30 said that lack of parental support, abuse or neglect, and malnutrition or poor health are problems. What is the probability that a teacher selected at random from this group said that lack of parental support is the only problem hampering a student's schooling? Hint: Draw a Venn diagram. (Round your answer to three decimal places.) Need Help? Watch It Talk to a Tutor

A radio news story claimed that half of all U.S. adults have Internet access. In a national poll about Internet usage (The Pew Internet Project), 12,638 U.S. adults were surveyed and it was found that 6413 of those surveyed had Internet access. At a 5% level of significance, perform a hypothesis test to test the claim made by the radio news story. The correct conclusion is: Group of answer choices half of all U.S. adults have Internet access. less than half of all U.S. adults have Internet access. The percentage of U.S. adults that have Internet access is not one-half. more than half of all U.S. adults have Internet access.

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A dentist wants to a conduct a survey via telephone to determine what percent of all adults in their city floss daily. Which of these is the best example of response bias?     Some people might not answer their phone after repeated calls.     People with unlisted phone numbers or people with cell phones might be left out of the sample.     Some people might refuse to tell a stranger on the phone about their flossing habits.     Some people might feel pressured to say they floss even though they don’t.

USA Today (Feb. 17, 2011) described a survey of 1,008 American adults. One question on the survey asked people if they had ever sent a love letter using e-mail. Suppose that this survey used a random sample of adults and 205 stated that they had written a love letter using e-mail. Is this evidence that more than 20% of American adults have written a love letter using e-mail? Use a level of significance of 5%. a) p: (3 decimal places) b) Complete the following areas. Label the critical value and test statistic on the curve and shade the rejection region(s). Họ: Hi: Type of Test: Test Statistic: (2 decimal places) Critical Value(s): (2 decimal places) P-Value: (4 decimal places) Reject or Fail to Reject:

The book Survey Responses: An Evaluation of Their Validity, by E. J. Wentland and K. Smith (Academic Press), includes studies reporting the accuracy of answers to questions from surveys. A study by Locander and others considered the question “Are you a registered voter?” Accuracy of response was confirmed by a check of city voting records. Two methods of survey were used: a face-to-face interview and a telephone interview. A random sample of 93 people were asked the voter registration question face-to-face. Seventy-nine respondents gave accurate answers (as verified by city records). Another random sample of 83 people were asked the same question during a telephone interview. Seventy-four respondents gave accurate answers. Assume that the samples are representative of the general population. (a) Let p1 be the population proportion of all people who answer the voter-registration question accurately during a face-to-face interview. Let p2 be the population proportion of all people who…

A real estate software program gives the estimated values of homes and lists characteristics of the homes. A prospective home buyer used the program to collect a sample of twenty-five homes and recorded the estimated value of the homes and how many bathrooms they contain. The prospective home buyer wants to investigate whether there is an association between the number of bathrooms a home contains and the estimated value of the home. Assuming all conditions for inference are met, which of the following significance tests should be used for the investigation?     A two-sample z-test for a difference between proportions A A linear regression t-test for slope B A matched pairs t-test for a mean difference C A two-sample t-test for a difference between means D A chi-square test of independence E

If a hurricane was headed your way, would you evacuate? The headline of a press release states, "Thirty-two Percent of People on High-Risk Coast Will Refuse Evacuation Order, Survey of Hurricane Preparedness Finds." This headline was based on a survey of 4,625 adults who live within 20 miles of the coast in high hurricane risk counties of eight southern states. In selecting the sample, care was taken to ensure that the sample would be representative of the population of coastal residents in these states. In USE SALT (a) Use this information to estimate the proportion of coastal residents who would evacuate using a 98% confidence interval. (Round your answers to three decimal places.) (b) Write a few sentences interpreting the interval and the confidence level associated with the interval. We are % confident that the proportion of all coastal residents who -Select-- v evacuate is within the confidence interval. If we were to take a large number of random samples of size 4,625, % of the…