1 Identify H0 and H1 The mean top of knee height of a sitting male is 20.7 in. 2 Identify H0 and H1 High school teachers have incomes with a standard deviation that is less than $20,000. 3 Find critical values Two-tailed test; a =0.01. 4 Find critical values Left-tailed test; a =0.05. 5 Find critical values
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Use the Internet or other resources to find an example of a research article in a professional journal of interest to you, and not in daily periodicals or weekly publications. Prepare a synopsis of the article including the following: a. Define the business research and its purpose. b. Explain the business problem(s) under i
Question 1 For the given data, find (a) the point estimate of the population mean and (b) the margin of error for a 90% confidence interval. Lengths of work commute of 32 people (in miles): 12 9 7 2 8 7 3 27 21 10 13 3 7 2 30 7 6 13 6 14 4 1 10 3 13 6 2 9 2 12 16 18 Question 2 a. Find the critical value of tc for the
A sample of employees at a large chemical plant was asked to indicate a preference for one of three pension plans. The results are given in the following table. Does it seem that there is a relationship between the pension plan selected and the job classification of the employees? Use the .01 significance level. Pension Pla
What is the difference between practical significance and statistical significance? Can you give me an example?
A sample of 60 college students was given a special training program designed to improve their time management skills. One month after completing the course the students were contacted and asked whether the skills learned in the program were effective. A total of 42 responded yes. At the .05 significance level, can we conclude t
Question 1 Which one of the following statements is true to perform a z-test for the difference between two population mean μ1 and μ2? a. Three conditions are required to perform such a test. b. The samples must be independent and selected randomly. c. Sample size must be at least 30. d. All of the above. Ques
Question 1 Which one of the following statements is true to perform a z-test for the difference between two population mean mu1 and mu2? a. Three conditions are required to perform such a test. b. The samples must be independent and selected randomly. c. Sample size must be at least 30. d. All of the above. Question 2
A computer manufacturer offers a help line that purchasers can call for help 24 hours a day, 7 days a week. Clearing these calls for help in a timely fashion is important to the company's image. After telling the caller that resolution of the problem is important the caller is asked whether the issue is "software" or "hardware"
Question 1 Multiple Choice In testing hypotheses, the researcher initially assumes: the alternative hypothesis is true. the null hypothesis is true errors cannot be made the population parameter of interest is known Question 2 Multiple Choice The rejection and non rejection regions are divid
1. Whenever hypotheses are established such that the alternative hypothesis is ">", then this would be a _______. two-tailed test Type II test one-tailed test Type I test 2. If x is uniformly distributed over the interval 8 to 12, inclusively (8 ≤x ≤12), then the P(9 ≤x ≤11) is ______
1. Suppose you are working with a data set that is normally distributed with a mean of 400 and a standard deviation of 20. Determine the value of x such that only 1% of the values are greater than x. 353.4 446.6 405 400.039 2. When the rod shearing process at Stockton Steel is "in control" it produces rods
1. Ophelia O'Brien, VP of Consumer Credit of American First Banks (AFB), monitors the default rate on personal loans at the AFB member banks. One of her standard's is "no more than 5% of personal loans should be in default." On each Friday, the default rate is calculated for a sample of 500 personal loans. Last Friday's sample c
What is the importance of hypothesis testing for independence of variables using two-way tables? Is there an example of this for a better understanding?
1. For any normal distribution, any value less than the mean would have a _______. a) negative probability of occurring b) negative z-score c) positive z-score d) negative variance 2. The diameter of 3.5 inch diskettes is normally distributed. Periodically, quality control inspectors at Dallas Diskettes randomly se
? Description of data analysis procedures o Selection/justification of your basic statistical approach o Test(s) of assumptions underlying the statistical approach o Any modification made based on your test(s) of assumptions ? Description of findings o Summary table comparing groups o Accompanying narrative stateme
How do we go about interpreting the results of various types of statistical tests in health care research?
Statistics Study Questions: Multiple choice questions on t distribution, z distribution, hypothesis, chi-squared distribution, confidence level, margin of error, critical value, degrees of freedom, sample size
Question 1 Which level of confidence would produce the widest confidence interval? A. 98% B. 90% C. 95% D. 99% Question 2 What is the margin of error if c = 0.9, s = 1.5, n = 50 A. 1.645 B. 0.1 C. 0.349 D. 0.049 Question 3 For a sample less than 30 we can use t-distribution only if A. The population is nor
What is the F critical value to be used at the 0.05 level of significance with 7 numerator degrees of freedom and 12 denominator degrees of freedom? What is the chi-square critical value with 12 degrees of freedom for a 0.05 probability? What is the exact probability of a value that fits a chi-square distribution with 17 d
A manager hopes to improve the sales figures for 10 employees by sending them to a motivational seminar. To test the effectiveness of this seminar, the manager compares the sales figures for each salesperson for the month immediately prior to the seminar and the month immediately following it. Employee before after H
For the following set of data, test the hypothesis that the average is 10. Run a test of that hypothesis and present the conclusion. x 8.9 9.7 10.3 8.5 10.4 9.3 9.8 7.1 10.6 11.1
Can you show me an example of this? I am a nurse, can you show me an example from the health care field to help me to understand this?
Why do statisticians shudder at the word "prove" and use words like support, accept the H1, and reject the Ho etc.?
What is a "p" value and why do we need it? (Hint: What does it give us in addition to our alpha?)
Explain the difference between a 1 and a 2 tailed test. When is each used?
From the 18 readings I calculated that the mean time was 65.37 minutes and the standard deviation was 8.2, which was pretty close to the claim in the newspaper. But was it enough difference to call him a fraud? What I needed was an hypothesis test! I used the "Student's t Distribution" because I have a small sample. I let my
1. Compute the critical values for a 2-tailed z-test with alpha = 0.01. Explain your answer. Sample mean = 78.47 Population mean = 75.8 Population standard deviation = 7.5 Standard error of the sample mean = .898 n= 100 2. We had to determine the critical value of z to make our accept/reject decision; In this analysis
A door manufacturer wants to monitor the performance of a new painting process, which has been designed to apply paint with a mean thickness of 0.7mm, by detecting any departure from this target. One hundred doors will be randomly chosen from a day's production, and the thickness of paint on each of the 100 doors will be measure
At .05 significance level, is there a difference in the distribution of heart attacks based on the amount smoked?
Note: Assume the condition of Normality is met for problem below. A study is made of men over the age of 50. Each man is classified as to whether or not he has had a heart attack and the amount that he smokes at the present time. The following results were obtained for a sample of 300 men. Heart Attack Amount smoked