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?
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
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
Fishing question Assume the condition of Normality is met for the problem below. I also want to know the following elements: (Please do not use the Student t test, nor a Chi-square test) Two-tailed test ok? 1. The U.S. Fish and Wildlife Service's report on the bass population of North American lakes indicated average we
Attached is a 5 step hypothesis test. I have tried to work through this and am stuck on step 4 and 5. I am not 100% sure I am using the correct test statistic and am totally lost on step 4. This test is being done on only one sample. The sample is below: 2.05 2.06 2.07 2.07 2.08 2.11 2.14 2.15 2.16 2.17 2.18 2.
The Damon family owns a large grape vineyard in western New York along Lake Erie. The grapevines must be sprayed at the beginning of the growing season to protect against various insects and diseases. Two new insecticides have just been marketed: Pernod 5 and Action. To test their effectiveness, three long rows were selected and
Following are the quantities and prices for the years 2000 and 2003 for Kinzua Valley Geriatrics. Use 2000 as the base period. a. Determine the simple price indexes. b. Determine the simple aggregate price indexes for the two years. c. Determine Laspeyres' price index. d. Determine the Paasche price index. e. Determi
The use of cellular phones in automobiles has increased dramatically in the last few years. Of concern to traffic experts, as well as manufacturers of cellular phones, is the effect on accident rates. Is someone who is using a cellular phone more likely to be involved in a traffic accident? What is your conclusion from the follo
The null hypothesis and the alternate are: H0: The cell categories are equal. H1: The cell categories are not equal. a. State the decision rule, using the 0.05 significance level. (Round to 3 decimal places.) b. Compute the value of chi-square. (Round answer to 4 decimal places.) c. What is y
1) Perform the five-step hypothesis test on your data. 2) Describe the results of your tests and compare the results to the results of the test performed for your previous Hypothesis Testing Paper. See attached files for full additional information.
In the mid-1990s, Colgate-Palmolive had developed a new toothpaste for the U.S. market, Colgate Total, with an antibacterial ingredient that was already being successfully sold overseas. However, the word antibacterial was not allowed for such products by the Food and Drug Administration rules. So Colgate-Palmolive had to come
See attached file for full problem description. Problem 1 You own a radio station and you have three salespeople. Below is a listing of their sales for the last eight weeks. Please use α .05 to decide if there is a difference in the means. Problem 2 Research the area where you live, or any other city you like. Fin
12. The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds. a. What is the value of the population mean? What is the best estimate of this value? b. Explain why we need to use