#1. An investigator wants to estimate caffeine consumption in high school students. How many students would be required to ensure that a 95% confidence interval estimate for the mean caffine intake(measured in mg) is within 15 units of the true mean? Assume that the standard deviation in caffine intake is 68 mg. #2. Consid
Question 1: What is a type I and type II errors in hypothesis testing? What would be examples of each? Explain Question 2: What is the difference between statistical significance and practical significance? Why is statistical significance not necessarily of practical important difference to a business decision? Provide a
Identifying Type I and II error that corresponds to the given hypothesis. The percentage of households with at least two cell phones is less than 60%. (i) Type I error (in the words of the problem): (ii) Type II error (in the words of the problem):
1. Find the critical z values. In each case, assume that the normal distribution applies Left-tailed test, α =0.05 2. Α = 0.005; H1 is p ≠ 0.20 3. Use the given information to find the P-value The test statistic in a two-tailed test is z= -1.63 4. With H1:p<0.32, the test statistic is z=-1.90 5.
We know from past research that very satisfied customers give the XYZ-Box video game system a satisfaction rating on our rating scale that is at least 42. Suppose that the manufacturer of the XYZ-Box wishes to use a random sample of 65 satisfaction ratings to provide evidence supporting the claim that the mean satisfaction ratin
A researcher asks whether attending a private high school leads to higher or lower performance on a test of social skills when compared to students attending public schools. A sample of 100 students from a private school produces a mean score of 71.30. The population mean (m) for students from public high schools is 75.62. The p
What is the purpose for post tests? A. To determine how much difference exists between the treatments. B. To determine which treatments are significantly different. C. To determine whether or not a Type I error was committed. D. None of these choices are correct.
Describe the five steps of hypothesis testing. Compare Type I and Type II errors and give specific examples for each. Which error should be minimized the most and first? Compare Type I and Type II errors and give specific examples for each. Which error should be minimized the most and first?
Dr. H wants to conduct a statistical test that will show her new medication to be effective in decreasing violence in criminals. a. What is the null hypothesis? b. What is the alternate hypothesis? She statistically shows that her medication decreases violence in criminals, but in actuality, it has no effect. c. What type
Read the passage below, and then consider the following scenario. A physician is trying to decide whether to prescribe medication for cholesterol reduction in a 45-year-old female patient. The null hypothesis is that the patient's cholesterol is less than the threshold of treatable hypercholesterolemia. However, a sample of
Identifying errors: Write sentences describing type I and type II errors for a hypothesis test of the indicated claim. 1) ER Visits: A hospital spokesperson states that 2% of emergency room visit by college undergraduates are for alcohol-related health problems. Identifying tests: Determine whether the hypothesis test for
The average gasoline price of one of the major oil companies has been $1.25 per gallon. Recently, the company has undertaken several efficiency measures in order to reduce prices. Management is interested in determining whether their efficiency measures have actually reduced prices. Answer the following questions for a hypothesi
A researcher studying stress is interested in the blood pressure measurements of chief executive officers (CEOs) of major corporations. He believes that the mean systolic blood pressure, , of CEOs of major corporations is different from mm Hg, which is the value reported in a possibly outdated journal article. He plans to perf
A sample of 200 items will be taken and the population standard deviation is σ; = 10. Use α = .05. Compute the probability of making a Type II error, if, unbeknownst to the tester, the real mean is 18. Show all work and include a sketch that represents β.
Show how and if genetically modified foods are different from non-genetically modified (NGM) foods. Assume you are continuing your analysis of GM and NGM foods, and answer the following questions: 1. What would be the practical negative impact if your hypothesis test incurred a Type I Error? What would be the practical neg
A man is on trial accused of murder in the first degree. The prosecutor presents evidence that he hopes will convince the jury to reject the hypothesis that the man is innocent. This situation can be ...there is moreshow problem A man is on trial accused of murder in the first degree. The prosecutor presents evidence that he hop
A corporation owns a factory that produces sulfuric acid. Because of changing conditions, the plant's output is quite variable. The company's president has observed that the output is normally distributed with a mean of 8,200 pieces per hour. He recently has been informed that the government is considering a new law that would
I would like you help to explain this problem... 9.13 In the U.S. legal system, a defendant is presume innocent until proven guilty. Consider a null hypothesis H o. that the defendant is innocent, and an alternative hypothesis H 1 that the defendant is guilty. A jury has two possible decisions: Convict the defendant(i.e., do
Explain what is meant by sampling error, response error, and non-response error in survey research
CoffeeTime has made great strides in gaining market share in Mumbai. In order to maximize our profit potential in this challenging market, it will be necessary to carefully analyze predictors of increased revenue so that we do not spend on unnecessary advertising or raise prices out of proportion to the market. Therefore, we hav
The feasibility of constructing a profitable electricity-producing windmill depends on the mean velocity of the wind. For a certain type of windmill, the mean would have to exceed 20 miles per hour in order for its construction to be warranted. The determination of a site's feasibility is a two stage process. In the first sta
These are non-statistical testing questions For each, identify the hypotheses, define Type I and Type II errors, and discuss the consequences of each error. In setting up the hypotheses, you will have to consider where to place the "burden of proof" 11.1 It is the responsibility of the federal government to judge the safety
The Oasis Chemical Company develops and manufactures pharmaceutical drugs for distribution and sale in the United States. The pharmaceutical business can be very lucrative when useful and safe drugs are introduced into the market. Whenever the Oasis research lab considers putting a drug into production, the company must establ
A significance test is used to prevent a machine from under filling or overfilling quart bottles. On the basis of a sample, the null hypothesis is rejected and the machine is shut down for inspection. A thorough examination reveals there is nothing wrong with the filling machine. From a statistical standpoint, was there
Using null hypothesis and alternative hypothesis if juries must make a decision about the guilt or innocence of a defendant: Suppose you are on a jury of a murder trial. It is obviously a mistake if the jury claims the suspect is guilty when in fact he/she is innocent. a. What type error would this be? b. What is the other t
1. A Type II error is committed when a) we reject a null hypothesis that is true. b) we don't reject a null hypothesis that is true. c) we reject a null hypothesis that is false. d) we don't reject a null hypothesis that is false. 2. A Type I error is committed when a) we reject a null hypothesis that is true. b) we
A man is on trial accused of murder in the first degree. The prosecutor presents evidence that he hopes will convince the jury to reject the hypothesis that the man is innocent. This situation can be modeled as a significance test with the following hypotheses: Ho: The defendant is innocent H1: The defendant is not innocent S
Solutions to Network Model problems related to Cost Minimization, and Shortest route algorithm are given with step by step explanation in easy to understand language. Please see the problems if you need solutions to such type of problems. I assure, if you need solutions to such type of problems, you can use these solutions as mo
How might type I and type II errors relate to quality control and risk management in differing industries?For example, manufacturing pharmaceuticals versus shoes? Which industries might opt toward one error over another and why? Description on the following: Type I error -- Wrongful Rejection (Alpha risk) Type II error -- W
Please help by giving substantive definitions to help me understand the following statistics terms. F distribution F test independent sample paired comparison paired samples paired t test pooled estimate pooled proportion pooled variance two-sample tests Type I error and Type II error.