The McDonald Bridge between Halifax and Dartmouth is in need of structural repairs. Approximately 25, 000 vehicles cross this bridge every day. Transportation officials have decided to conduct a hypothesis test and will raise tolls to fund the repairs if there is evidence to suggest that the true mean number of cars per day using this bridge has increased. a. Write the null and alternative hypotheses about µ , the mean number of cars per day that cross the McDonald Bridge. b. For the hypotheses in part a, describe the Type I and Type II errors. c. If a Type I error is committed, who is more angry, the transportation officials or drivers and why? d. If a Type II error is committed, who is more angry, the transportation officials or drivers, and why?

According to a report on consumer fraud and identity theft, 20% of all complaints for a year were for identity theft. In that year, Rhode Island had 717 complaints of identity theft out of 3498 consumer complaints. Does this data provide enough evidence to show that Rhode Island had a higher proportion of identity theft than 20%? Test at the 5% level. State the hypotheses. Họ: p ? Ha: P Calculate the test statistic. Round to four decimal places. Calculate the standardized test statistic. Round to three decimal places. z = Find the p-value. Round to four decimal places. p-value = State your decision. O Since the p-value is less than .05, reject Ho. O Since the p-value is greater than .05, fail to reject Hg. O Since the p-value is less than .05, fail to reject Hg. O Since the p-value is greater than .05, reject Ho. Interpret the results. O At the 5% level of significance, there is enough evidence to show that the proportion of complaints due to identity theft in Rhode Island is more than…

State the conclusion based on the results of the test. According to the Federal Housing Finance Board, the mean price of a single-family home two years ago was $299,100. A real estate broker believes that because of the recent credit crunch, the mean price has increased since then. The null hypothesis is not rejected. Choose the correct answer below. O A. There is not sufficient evidence to conclude that the mean price of a single-family home has increased from its level two years ago of $299,100. O B. There is sufficient evidence to conclude that the mean price of a single-family home has decreased from its level two years ago of $299,100. C. There is sufficient evidence to conclude that the mean price of a single-family home has increased from its level two years ago of $299,100. O D. There is not sufficient evidence to conclude that the mean price of a single-family home has decreased from its level two years ago of $299,100.

A magazine reported that at the top 50 business schools in a​ region, students studied an average of 14.4 hours. Set up a hypothesis test to try to prove that the mean number of hours studied at your school is different from the reported 14.4 hour benchmark. Complete parts​ (a) through​ (c) below.       Question content area bottom Part 1 a. State the null and alternative hypotheses. Choose the correct answer below.     A. H0​: μ=14.4 H1​: X≠14.4     B. H0​: α≠14.4 H1​: α=14.4     C. H0​: α≠14.4 H1​: β=14.4     D. H0​: β=14.4 H1​: β≠14.4     E. H0​: μ≠14.4 H1​: X=14.4     F. H0​: μ=14.4 H1​: μ≠14.4     G. H0​: α=14.4 H1​: β≠14.4     H. H0​: β≠14.4 H1​: β=14.4     I. H0​: X≠14.4 H1​: X=14.4     J. H0​: α=14.4 H1​: α≠14.4     K. H0​: μ≠14.4 H1​: μ=14.4     L. H0​: X=14.4 H1​: X≠14.4   Part 2 b. What is a Type I error for your​ test?     A. Concluding that the mean…

Several studies showed that after eating a low-fat cereal for two meals a day​, subjects had lost some weight.A cereal companyfinanced this research. Identify what is wrong. Choose the correct answer below.     A. Since the research is composed of voluntary response​ samples, there may be key data points missing.   B. The data used in the studies is not reliable because it was not measured by the administrator.   C. It is questionable that the sponsor is a cereal company because this sponsor can be greatly affected by the conclusion.   D. It is not possible to take accurate measurements.

Question 2 > The average number of cavities that thirty-year-old Americans have had in their lifetimes is 7. Do twenty- year-olds have a different number of cavities? The data show the results of a survey of 14 twenty-year-olds who were asked how many cavities they have had. Assume that the distribution of the population is normal. 7, 8, 7, 7, 9, 7, 10, 9, 8, 10, 6, 9, 6, 8 What can be concluded at the a = 0.05 level of significance? %3D a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Но: |? Select an answer H1: Select an answer v c. The test statistic ? v = (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value is ? va f. Based on this, we should Select an answer v the null hypothesis. g. Thus, the final conclusion is that . The data suggest the populaton mean is significantly different from 7 at a = 0.05, so there is sufficient evidence to conclude that the…