A college class believes that the average grade average of psychology students and the average grade averages of biology students are different. The class found that the actual grade averages of a sample of 8 psychology students was 3.5 and the average grade average of a sample of 11 biology students was 3.2. What is the null hy
Question #1- Using your experience from previous or current employment, provide a business example where you could use a t-test to assist in a business decision. State the null and alternative hypothesis. The null and alternative should be the exact opposite of each other and the t-test will be looking for a difference between t
Are the following statements Ho: mu "greater than or equal to" 11 Ha: mu "greater than or equal to" 18 a valid pair of null and alternative hypothesis? A) No, there are no parameters contained in these statements B) No, the alternative hypothesis cannot contain numeric values C) No, these statements have overlap
Imagine that you have been contracted to create a test to assist in the admission process at a university. What factors would be considered and what steps would be taken to ensure reliability and validity of this test? Explain why these factors and steps are important.
A summary on the daily consumption of caffeine for a sample size of 49 adult women produced: Ð? = 49 X bar = 215 mg s = 235 mg range: 5 to 1176 1. Does it appear plausible that the population distribution of daily caffeine consumption is normal? Explain 2. Is it necessary to assume a normal population distribut
See attached data file. Assignment 6 Measuring Differences Between Two Means (1) Go to the Resources section in this syllabus and open the file restaurants.xls. This data file contains ratings for food, decor, service, and the price per person for a sample of 50 restaurants located in an urban area and 50 restaurants
Human Body Temperature: What's Normal? In an article in the Journal of Statistics Education (vol. 4, no. 2, 1996), Allen Shoemaker describes a study that was reported in the Journal of the American Medical Association.* It is generally accepted that the mean body temperature of adult humans is 98.6°F. In his article, Shoemaker
Problems 23 & 37 For each claim, assume the distribution of the population is approximately normal. 23. Microwave Repair Costs ◆ A microwave oven repairer says that the mean repair cost for damaged microwave ovens is less than $100.You work for the repairer and want to test this claim. You find that a random sample
Sethi and Seligman examine relationship between religious optimism and conservatism. Test differences if possible
An engineering firm is evaluating their back charges. They originally believed their average back charge was $1800. They are concerned that the true average is higher, which could hurt their quarterly earnings. They randomly select 40 customers, and calculate the corresponding sample mean back charge to be $1950. If the standa
Prepare an analysis of your selected article. Start by identifying and summarizing the hypothesis described in the article. Then explain whether the hypothesis was rejected or accepted, and what the implications of this finding are for the study. Use the following article: Job satisfaction of managers in tourism: Cases in the
The structure of a two-factor study can be presented as matrix with the levels of one factor determining the rows and the levels of the second factor determining the columns. With this structure in mind, describe the mean differences that are evaluated by each of the three hypothesis tests that make up a two-factor ANOVA.
1. Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation. Use a significance level of .05. R = -0.8444, n=5 Critical values: r =± 0.950, no significant linear correlation
(TCO 8) The mean age of school bus drivers in Denver is claimed to be 56.9 years. A hypothesis test is performed at a level of significance of 0.05 with a P-value of 0.03. Choose the best interpretation of the hypothesis test. Reject the null hypothesis; there is enough evidence to reject the claim that the mean ag
(TCO 11) A 15-minute Oil and Lube service claims that their average service time is no more than 15 minutes. A random sample of 40 service times was collected, and the sample mean was found to be 15.4 minutes, with a sample standard deviation of 3.2 minutes. Is there evidence to support, or to reject the claim at the alpha = 0.0
Please show all work. More men than women were randomly assigned to the Clardozan group. After a careful examination of the results, the pharmaceutical company wonders if gender influenced the results. Conduct a test to determine if there was a relationship between gender and group assignment using the .05 level of signific
What are the 3 Levels of Measurement and the 2 variables in any hypothesis statement?
Problem A The manager of a grocery store claims that the average time that customers spend in checkout lines is 20 minutes or less. A sample of 36 customers is taken. The average time spent on checkout lines for the sample is 24.6 minutes; and the sample standard deviation is 12 minutes. Conduct a hypothesis test (at 0.05 l
1. Last year, according to consumer group, the average passenger vehicle was driven 10.3 thousand miles with a standard deviation of 2 thousand miles before a claim of accident was made. A random sample of 225 passenger cars was collected by the auto insurance company which showed a mean of 10.1 thousand miles driven when a cl
Suppose a wedding photographer claims he can finish a bride's wedding photos in less than 7 days. You are given the following data from a sample. Sample size: 40 Population standard deviation: 1 Sample mean: 7.2 Formulate a hypothesis test to evaluate the claim. Which one is correct? A) Ho: µ = 7; Ha:
Suppose a wedding photographer claims he can finish a bride's wedding photos in less than 7 days. You are given the following data from a sample. Sample size: 40 Population standard deviation: 1 Sample mean: 7.2
1. (TCO 8) For the following statement, write the null hypothesis and the alternative hypothesis. Then, label the one that is the claim being made. A special insulation will lower your heating bills by less than $78. 2. (TCO 11) A 15-minute Oil and Lube service claims that their average service time is no more than 15 m
1. Assume that you plan to use a significance level of ? = .05 to test the claim that p1 =p2. Use the given sample sizes and numbers of successes to find the pooled estimate p. Round to the nearest thousandth n1 = 34 n2 = 414 x1 = 15 x2 =105 2. Assume that you plan to use a significance level of ? = .05 to test the
Validity is more critical to measurement than reliability. A valid measurement is reliable, but a reliable measurement may not be valid. Do you agree with these statements? Explain your answer. Provide examples to support your rationale.
Hope you can help me to understand and do this assignment. Thanks much. How does hypothesis testing contribute to the scientific knowledge base? What is one example of a null hypothesis statement?
See attached data file. At the .05 level of significance, is there evidence of a significant relationship between age group and where people get their news? If so, explain the relationship. In all cases, make sure to state the null and alternative hypotheses, your statistical decision based on the outcomes (reject or fail to
Explain what you know about hypothesis and hypothesis testing. Describe the five-step hypothesis-testing procedure? Discuss the concepts of Type I and Type II Errors? How do they relate to hypothesis testing?
Develop one business research question from which you will formulate a research hypothesis that will test 2 or more populations Prepare a paper describing the results of a hypothesis test of two populations or more than two populations Include the following in your paper: A-Formulate both a numerical and verbal hypot
Identify the null hypothesis and alternative hypothesis from a given claim, and determine how to express both in symbolic form. The formulas and data are attached. What is needed is to do is explain what is going on in the Excel spreadsheet; basically, make a translation of the math into english. --- Null Hypothesis The
What is the importance of the null hypothesis? Why has it been the backbone of mainstream hypothesis testing for decades? What are its limitations? What is the value of performing hypotheses tests to solve problems related to business and operations management? Provide specific examples.