A meteorologist stated that the average temperature during July in Chattanooga was 80 degrees. A sample of July temperatures over a 32-year period was taken. The correct set of hypotheses is _____.   a. H0: μ ≠ 80 Ha: μ = 80     b. H0: μ = 80 Ha: μ ≠ 80     c. H0: μ < 80 Ha: μ ≤ 80     d. H0: μ ≤ 80 Ha: μ > 80

B. Which of the following statements is/are true? (2 points) a) A sample is always identical to the population b) From a sample, we can usually calculate a population parameter exactly. c) A sample can be used to estimate population parameters. d) From a sample, we can usually calculate a sample statistic exactly.

A physician wants to copmaure the blood pressures of six patients before and after treatment with a drug. The blood pressures are as follows:  The physician wants to test if there is a significant change of the clood pressure before and after the drug at 0.05 level of significance. the absolute value of the test statistic and the absolute value of the test are, respectively: A. 0.7192 and 1.812 B. 0.7192 and 2.228  C. 1.6151 and 2.015  D. 1.6151 and 2.571

The National Highway Traffic Safety Administration reported the percentage of traffic accidents occurring each day of the week. Assume that a sample of 420 accidents provided the following data. Sunday Monday Tuesday Wednesday Thursday Friday Saturday 66 80 50 53 O Ho: Psun PMon PTue #Pwed * PThu * PFri * Psat * # # H₂: All proportions are equal. 48 (a) Conduct a hypothesis test to determine if the proportion of traffic accidents is the same for each day of the week. Use a 0.05 level of significance. State the null and alternative hypotheses. Ho: : Not all proportions are equal. H₂: Psun * PMon * PTue * Pwed * PThu * PFri * Psat */ OH: Not all proportions are equal. Ha: Psun = PMon=PTue=Pwed=PThu = PFri = Pat = H₂ : Not all proportions are equal. = Ho: Psun PMon=PTue = Pwed=PThu Fri Sat = = 7 55 68 Find the p-value. (Round your answer to four decimal places.) p-value = Find the value of the test statistic. (Round your answer to three decimal places.) X State your conclusion. O Reject…

A medical journal published new medical research about diastolic blood pressure. Let the mean diastolic blood pressure reading be u mmHg. If a doctor wants to know if the new medical research discussed in the journal results in diastolic blood pressure readings that are, on average, less than 75 mmHg, what are the null and alternative hypotheses? Select the correct answer below: Ho: µ = 75; Ha:H 75 %3D O Ho: µ = 75; Ha: µ + 75

A national survey reports that the average number of screens (TVs, computers, tablets, and smartphones) in a single-family household 9.5. You believe that average may be different in Hartsville. State the null and alternative hypothesis for the claim that the average number of screens per household in Hartsville is not 9.5. Select your answer from one of the following options. a. ?0:?≥9.5??:?<9.5 b. ?0:?=9.5??:?≠9.5 c. ?0:?>9.5??:?≤9.5 d. ?0:?≠9.5??:?=9.5 e. ?0:?≤9.5??:?>9.5

A sample is selected from a normal population with µ = 54 and σ = 8. Which of the following samples would be considered extreme and unrepresentative for this population? A. M = 53 and n = 81 B. M = 52 and n = 36 C. M = 53 and n = 36 D. M = 52 and n = 81

Given Ho: μ = 25, Ha: μ# 25, and P = 0.049. Do you reject or fail to reject Ho at the 0.01 level of significance? O A. not sufficient information to decide B. fail to reject Ho O C. reject Ho

A reasearcher measured the body temperatures of a randomly selected group of adults. The summaries of the data he collected are in the accompanying tables. Estimate the average​ (or "normal") temperature among the adult population. Complete parts a through e below.   ​a) Check the conditions for creating a​ t-interval. Which​ condition(s) is(are)​ met? Select all that apply.     A. Randomization Condition   B. ​10% Condition   C. Nearly Normal Condition ​b) Find a 90​% confidence interval for the mean body temperature.   The 90​% confidence interval for the mean body temperature is ​(nothing​,nothing​). ​(Round to two decimal places as​ needed.) ​c) Explain the meaning of the interval. Choose the correct answer below.     A. There is 90​% ​confidence, based on the​ data, that the interval contains the mean body temperature.   B. There is 90​% ​confidence, based on the​ data, that the mean body temperature will always fall in the interval.   C.…

The commercial for the new Meat Man Barbecue claims that it takes 14 minutes for assembly. A consumer advocate thinks that the assembly time is lower than 14 minutes. The advocate surveyed 12 randomly selected people who purchased the Meat Man Barbecue and found that their average time was 13.5 minutes. The standard deviation for this survey group was 2.1 minutes. What can be concluded at the the a = 0.01 level of significance level of significance? You may assume the data are normally distributed.