See the attached fil 10.9 A problem with a telephone line that prevents a customer from receiving or making calls is disconcerting to both the customer and the telephone company. The data in the file PHONE represent samples of 20 problems reported to two different offices of a telephone company and the time to clear these
What is the statistical assumption? What would be considered the null hypothesis? The alternative hypothesis? Use the following information: The test of interest in this problem is the t-test for comparing two population means, the population mean hours worked last week for males and the population mean hours worked last
1. If you use a 0.10 level of significance in a (two-tail) hypothesis test, what is your decision rule for rejecting a null hypothesis that the population mean is 500 if you use the Z test? 2. Do students at your school study more, less, or about the same as at other business schools? Business Week reported that at the top
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 degF . In his article, Shoemaker uses the data from the JAM
1. HO: µ = 70 H1: µ > 70 ? = 20, n = 100, xbar = 80, ? = .01 a) calculate the value of the test statistic b) set up the rejection region. c) determine the p-value d) interpret the results attach file please 2. Draw the operating characteristic curve for n = 10, 50, and 100 for the following test: Ho: ? = 400
Is there a significant relationship between the death of infants by race and the cause of death? Infant deaths and mortality rates for the top 3 leading cause of death for African Americans, 2007. (Rates per 100,000 live births) Cause of Death # African African American Non-Hispanic Non-Hispanic Afric
A home improvement store recently purchased a new paint color-mixing machine. The machine is rated to produce 6 gallons of mixed paint every minute. The store's manager suspects that the machine is underperforming. In order to test his hypothesis, the manager tests the machine's output by mixing 10 randomly chosen colors and me
1) Test of two means. You should select a hypothesis you are interested in testing and then use a test of two means to test this hypothesis. For example, you may be interested in testing whether the GPA of females is higher than that of males in that class. One is going to draw the inference by using a random sample with repl
Consider the samples x1, ..., xN which satisfy the following model (see the attachment). x_n - sqrt(0) + w_n; n = 1, ..., N where [w_n] is i.i.d. with corresponding pdf f(w). We are interested in distinguishing between the two hypothesis Ho: theta = 0 and H1: theta > 0. Examine whether a locally optimum test exists that ca
The quality control director for a clothing manufacturer wants to study the effect of machines on the breaking strength (in pounds) of wool serge material. A batch of the material is cut into square-yard pieces, and these are randomly assigned, 12 each, to the three machines chosen specifically for the experiment. The results ar
The manufacturer of Boston and Vermont asphalt shingles knows that product weight is a major factor in the customer's perception of quality. Moreover, the weight represents the amount of raw materials being used and is therefore very important to the company from a cost standpoint. The last stage of the assembly line packages th
A clinical psychologist is treating 25 patients with clinical depression. She wants to find out whether these patients score differently than the general population on an emotional response scale with a population mean, ?= 9.5. She is only interested in whether there is a difference, but not in the direction of the difference a
1) The average salary of managers in the advertising industry is $180,000 per year. Suppose we would like to take a sample of managers at a new company ABC, to see whether the mean annual salary is different from that of the industry. State the null and alternative hypotheses. 2) Suppose a sample of 40 managers at ABC showed
Please reference attachments to answer the following: Choose Data1 or Data2, and work the following problems: The number of dummy variables is the number of levels of the categorical variable less one because the one left out is quantified by the intercept. Each coefficient of the dummy variables effects a shift in the in
The data in below represent the closing value of the Dow Jones Industrial Average (DJIA) over the 29 year period from 1979 through 2007. Year Coded Year DJIA 1979 0 838.7 1980 1 964.0 1981 2 875.0 1982 3 1046.5 1983 4 1258.6 1984 5 1211.6 1985 6 1546.7 1986 7 1896.0
Smoking in the United States: Does the survey of the previous question provide good evidence that less than ¼ of all American adults smoked in the week prior to the survey? a. State the hypotheses to be tested b. If your null hypothesis is true, what is the sampling distribution of the sample proportion p-hat? Sketch this d
Ten people were give two tests of balance, first while standing on level ground, and then while standing on a 30 degree slope. Their scores follow. Set up the appropriate variables, and enter the data into SPSS. Participant 1 2 3 4 5 6 7 8 9 10 Score standing on level ground 56 50 41 65 47 50 64 48 47 55 Score standing on
I'm having problems with these questions. I would like to have the explanations along with solutions. 1. Foa, Rothbaum, Riggs, and Murdock (1991) conducted a study evaluating four different types of therapy for rape victims. The Stress Inoculation Therapy (SIT) group received instructions on coping with stress. The Prolong
Question: The amount of water consumed each day by a healthy adult follows a normal distribution with a mean of 1.20 liters. A sample of 10 adults after the campaign shows the following consumption in liters: - 1.34 1.32 1.38 1.40 1.70 1.40 1.32 1.90 1.38 1.36 At the 0.10 significance level, can we conclu
At the time she was hired as a server at the Grumney Family Restaurant, Beth Brigden was told, "You can average $72 a day in tips." Assume the population of daily tips is normally distributed with a standard deviation of $2.45. Over the first 34 days she was employed at the restaurant, the mean daily amount of her tips was $73.0
A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor vehicle accident in the previous two years. At the .05 level, you are testing whet
Scenario: The manager of a package courier service believes that packages shipped at the end of the month are heavier than those shipped early in the month. As an experiment, he weighed a random sample of 20 packages at the beginning of the month. He found that the mean weight was 20.25 pounds and the standard deviation was 5.84
Question: Three assembly lines are used produce a certain component for an airliner. A random sample of six hourly periods are chosen for each assembly line and the number of components produced during these periods for each line is recorded. The output from a statistical software package is: Summary: Groups A - Count-6, Su
Attached is a simple spreadsheet I've compiled about the 21 commercial aircraft accidents in the US since 1972 that have at least one survivor and one death. I need help coming up with some good stats. Meaning, please look at the data and crunch the numbers to determine where/if it is safer to sit in the front or the back during
I need help understanding the results. I can't interpret the results and their differences. I attached the whole project so you can see what I am talking about. Results Section : a. The data should be explained in narrative form including what (of importance) was or was not statistically significant. c. Ad
In 2006, Visa wanted to move away from its long running television advertising them of "Visa, it's everywhere you want to be." During the Winter Olympics, Visa featured Olympians in commercials with a broader message, including security; check cards, and payment technologies such as contactless processing. One of the first comme
3. A chemical engineer is investigating the effect of process operating temperature on product yield. The study results in the following data; use your knowledge of least squares regression to construct a linear model for predicting yield from temperature. These data apply throughout question 3. Temp(Celsius) Yield (
Please explain how hypothesis testing is related/compared to our legal system.
Using the attached article, please help me respond to the following questions: 1. What is the main purpose and hypothesis of the study? 2. Develop a pictorial representation of the relationship between the variables that the authors studied. Include the level of measurement (nominal, ordinal, interval/ratio) for each identi
What is an important similarity between the uniform and normal probability distributions? A. The mean, median and mode are all equal. B. The mean and median are equal. C. They are negatively skewed. D. About 68% of all observations are within one standard deviation of the mean. The distribution of the annual incomes of a