1. Suppose you want to test the claim that the mean does not equal 3.5. Given a sample size of n = 31 and a level of significance of when should you reject H0 ? a. Reject H0 if the standardized test statistic is greater than 2.33 or less than -2.33 b. Reject H0 if the standardized test statistic is greater than 1.645 or les
Nicotine in cigarettes. To determine whether the mean nicotine content of a brand of cigarettes is greater than the advertised value of 1.4 milligrams, a health advocacy group tests H0: ¹ = 1:4 Ha: ¹ > 1:4 The calculated value of the test statistic is z = 2:42. (a) Is the result significant at the 5% level? (b) Is the res
Using the data set attached, develop one business research question from which you will formulate a research hypothesis that will test two or more populations. Describe the results of a hypothesis test of two populations or more than two populations (ANOVA). Include the following: i. Formulate both a numerical and verbal h
You will be asked to determine the correct decision (Reject Ho or Fail to Reject Ho) for each of the following tests of hypotheses. 1. A hypothesis test at the 0.025 level of significance with a p-value for the sample of 0.0075. 2. A hypothesis test at the 0.01 level of significance with a p-value for the sample of 0.012
Does Lavastatin reduce the risk of heart attack? In a Texas Study, researchers gave Lovastatin to 2,325 people, and a inactive substitute to 2,081 people, with an average age of 58. After 5 years, 57 of the lovastatin group suffered a heart attack, compared with 97 for the inactive pill. The level of significance of the test
2) Minimize Z = 1.80S + 2.20T Subject to: 5S + 8T => 200 15S + 6T => 240 4S + 12T => 180 T => 10 S, T => 0 (a) What are the optimum values of the decision variables and Z?
1. Determine whether the hypothesis test for each claim is left-tailed, right-tailed, or two tailed. Explain your reasoning. Lung Cancer: A government report claims that the proportion of lung cancer cases that are due to smoking is 87% 2. Testing Claims. (a) write the claim mathematically and identify H0 and Ha. (b)
Chapter Exercises 9.54 Faced with rising FAX costs, a firm issued a guideline that transmissions of 10 or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44
Data Analysis 32. Consider a random sample of 100 households from a middle-class neighborhood that was the recent focus of an economic development study conducted by the local government. Specifically, for each of the 100 households, information was gathered on each of the following variables: family size, location of th
Using ratio or interval numerical data from the data set attached, develop the following: 1. Develop a research question 2. Formulate a research hypothesis and null hypothesis 3. Decide the type of test and level of significance 4. Calculate the standard error 5. Find the critical region 6. Perform the hypothesis te
Please state your null and alternative hypothesis for the following cases. Please explain how do you make that decision on which is alternative and which is null. Remember that it comes to the point that what a researcher would like to test for. For example, when I test to see if a sereal box weighs as it is stated, I am tes
1. Explain the difference between testing a single mean, testing the difference between two means from an "independent sample" and testing mean differences from a "dependent sample". 2. Choose a variable. You will be comparing the means of two groups to each other. Your sample will consist of 12 subjects in each group. You ma
PROBLEM # 3 A certain type of cable was advertised as having a breaking strength of 1000 pounds. A test of XX pieces of this cable was conducted and the mean breaking strength of this sample was XXX pounds with a sample standard deviation of XX pounds. Conduct a two-tail hypotheses test at alpha = .05 to determine if this samp
A legal researcher is studying the age distribution of juries by comparing them with the overall age distribution of available jurors. The researcher claims that the jury distribution is different from the overall distribution; that is, there is a noticeable age bias in jury selection in this area.The table shows the number of j
1. Given the following data from two independent samples from which the population standard deviation is known, conduct a two-tailed hypothesis test to determine if the first sample mean is smaller than the second sample mean, given a 0.01 level of significance. n1 = 42 n2 = 30 xbar1= 39 xbar2 = 25 sigma1=8 sigma2 = 6
The following sample data shows the quarterly earnings in millions for two US companies. Your research interest is finding if the average earnings for these companies are different. Justify your answer by doing a five step testing of the hypothesis at the 0.05-level of significance. Show all the steps of the calculations. Com
How do hypothesis-testing procedures differ for the population mean when the population standard deviation is known or unknown? What is the relationship between two-sided hypothesis tests for means and confidence intervals? Why would the population variability and the sample size affects the power of a test? How do the leve
Q1: What do you remember from the CLT and it's implications? Please touch up on them. Q2: Please explain how this theory is used in testing hypothesis. Q3: What are confidence intervals telling us? Q4: What region under the normal curve corresponds to Researcher's confidence? Q5: What are the area under the 2 tai
Testing Claims (a) Write the claim mathematically and identify Ho and Ha, (b) find the critical value(s) and identify the rejection region(s), (c) find the standardized test statistic, (d) decide whether to reject or fail to reject the null hypothesis, and (e) interpret the decision in the context of the original claim.
Deciding on a Distribution, decide whether you should use a normal sampling distribution or a sampling distribution to perform the hypothesis test. Justify your decision. Then use the distribution to test the claim.Write a short paragraph about the results of the test and what you can conclude about the claim. 37. Gas Mile
Testing Claims, (a) write the claim mathematically and identify Ho and Ha. (b) find the critical value(s) and identify the rejection region(s). (c) find the standardized test statistic. (d) decide whether to reject or fail to reject the null hypothesis. (e) interpret the decision in the context of the original claim. For e
5 groups 7 values in each group if ssa= 60 and sst = 210, what is SSW. A. what is MSA. B. what is msw C. what is the value of the test statistic F? A. Construct a ANOVA summary table and fill in all values in the table B. At the 0.05 level of signifance what us the upper-tail critical value from the F distribution c. St
Cooling method for gas turbines. During periods of high electricit demand, especially during the hot summer months, the power output from a gas turbine engine can drop dramatically. One way to counter this drop in power is by cooling the inlet air to the gas turbine. An increasingly popular cooling method uses high pressure i
Using and Interpreting Concepts Testing Claims Using P-values, (a) write the claim mathematically and identify Ho and Ha. (b) find the standardized test statistic and its corresponding area. (c) find the value. (d) decide whether to reject or fail to reject the null hypothesis. (e) interpret the decision in the context of
Using and Interpreting Concepts Testing Claims Using P-values In Exercises 33-38, (a) write the claim mathematically and identify and . (b) find the standardized test statistic and its corresponding area. (c) find the value. (d) decide whether to reject or fail to reject the null hypothesis. (e) interpret the decision in t
Please help with these questions: The Manager at a light bulb factory wants to determine whether there is any difference in the mean life expectancy of light bulbs manufactured on two different, whether there is any difference in the mean life expectancy of light bulbs manufactured on two different models of machines. The pop
Is there evidence that the population mean amount is different from 1.0 Gallon (use a=0.01)? Compute the P-Value and interpret its meaning.
The manager of a paint supply store wants to determine whether the mean amount of paint conatined in 1- gallon cans purchased from a nationally known manufacturer is actually 1 gallon. You know from the manufacturer's specifications that the standard deviation of the amount of paint is 0.02 gallon. You select a random sample o
TThe public relations department of the Social Security Administration. In an effort to design better advertising campaigns, your department decides to conduct a survey to find out the opinions people in the US have about the system. One of the questions asked and the results of each respondent's age are shown to the left. Yo
How do research questions frame studies? What type of wording would lead to a qualitative study? A quantitative one? How does a researcher determine how many hypotheses are needed for a particular study?
· What is the role of theory in research proposals? · What are the elements of a study plan? Where might a beginning researcher lose logical flow among elements in a study plan? Why might that happen? · What are the pros and cons of selecting an established theoretical or conceptual model or framework? What are the pros