At the 0.05 level, can you conclude that the mean number is greater than 67? l:_:l Estimate the pvalue. -:I Listed below is the annual rate of return (reported in percent) for a sample of 12 taxable mutual funds. 4.63 4.15 4.76 4.79 4.65 4.52 4.70 5.86 4.42 4.51 4.24 4.52 Using the 0.05 significance level, is it reasonable to conclude that the mean rate of return is more than 4.50%? Click here for the Excel Data File a. What is the decision rule? (Round your answer to 3 decimal places.) _:|:I b. Compute the value of the test statistic. (Round your answer to 3 decimal places.) _:| The Buffalo, New York, Chamber of Commerce wants to estimate the mean time workers who are employed in the downtown area spend getting to work. A sample of 15 workers reveals the following number of minutes spent traveling. 14 24 24 19 24 7 31 29 26 23 23 28 16 15 21 Click here for the Excel Data File Develop a 98% condence interval for the population mean. (Round your answers to 2 decimal places.) _:-:|I Most air travelers now use e-tickets. Electronic ticketing allows passengers to not worry about a paper ticket, and it costs the airline companies less than paper ticketing. However, recently the airlines have received complaints from passengers regarding their e- tickets, particularly when connecting flights and a change of airlines were Involved. To investigate the problem, an Independent watchdog agency contacted a random sample of 20 airports and collected information on the number of complaints the airport had with e-tickets for the month of March. The Information is reported below. 14 15 16 12 12 14 13 16 15 14 At the 0.05 significance level, can the watchdog agency conclude the mean number of complaints per airport is less than 15 per month? Conduct a test of hypothesis and Interpret the results. Click here for the Excel Data File a. What assumption is necessary before conducting a test of hypothesis? Uniform population. Normal population. The mean and standard deviation are known. The population is very large. None needed. c-1. What is the decision rule? (Negative amount should be Indicated by a minus sign. Round your answer to 3 decimal places.) Reject HO: | 2 15 when the test statistic is c-2. Compute the value of the test statistic. (Negative amount should be Indicated by a minus sign. Round your answer to 2 decimal places.) Value of the test statistic c-3. What is your decision regarding the He? O Reject O Do not rejectThe manager of Tea for Us has been ordering stock based on the assumption that 40% of her customers prefer black teas, The following hypotheses are given: H0: p= 0,40 l-I1:p 1'5 0.40 She sampled 144 of her customers and found that only 30% of those preferred black teas. At the 0.10 significance level, can the null hypothesis be rejected? a. State the decision rule. (Negative answer should be indicated by a minus sign. Round the final answers to 2 decimal places.) (Click to select) v H0 (Click to select) v H1 if z > or z State the decision rule for 0.05 significance level. (Round your answer to 3 decimal places.) Reject HO if t> Compute the value of the test statistic. (Round your answer to 3 decimal places.) Value of the test statistic
