Question 1 The SAT scores of entering freshmen at X University have a normal distribution with mean μ1 = 1200 and standard deviation σ1 = 90, while the SAT scores of entering freshmen at Y University have a normal distribution with mean μ2 = 1215 and standard deviation σ2 = 110. Independent random samples
1) Find the expected values of the following probabilities...... 2) In a population of test scores not known to be probability distributions.... 5) Using the sample limit theorem...... 8) The null hypothesis that --- equals 75 for a sample of 25 subjects.... 9) Test the null hypothesis that ---- equals 50 for a sampl
Need a comparison between unemployment and import export data for the four different countries (China, Chile, Canada, and United States). Using the dataset attached (AISE CIA Global Demographics) and reviewing the tabs in the excel document. Use the five step hypothesis testing procedure. I am writing a paper that states
For each of the following scores, use the one-tail five percent (5%) criteria and determine if the occurrence of the score would be considered relatively likely or unlikely? a. 18 b. 24 c. 25 7. For a two-tailed test or nondirectional hypothesis, the researcher is interested in results that occur in either tail of the nor
Using numerical data from one of the 2005 Real Estate data set, develop one business research question (The research question is "Is an Average size house is 2000 square feet?") from which you will formulate a research hypothesis that will test two or more populations. Prepare a paper describing the results of a hypothesis t
Read the attached case study and complete the following: 1. Prepare a report exploring the data your team collected for the management of SJGR. This report should contain the results of the various data exploratory data analyses tools such as scatter charts, histograms, correlation coefficients, etc. and the interpretation of
We analyze whether the true mean discharge of wastewater per hour from an industrial plant exceeds the company claims of 1000 gallons. For the decision in the one-sided test using a=0.05: A) If the plant is not exceeding the limit, but actually the M=1000, there is only 5% chance that we will conclude that they are exceeding
What are areas of ethical concerns for researchers? What are the primary concerns in each area?
1.A researcher collects infant mortality data from a random sample of villages in a certain country. It is claimed that the average death rate in this country is the same as that of a neighboring country, which is known to be 17 deaths per 1000 live births. To test this claim using a test of hypotheses, what should the null and
Same sex marriages was legalized across Canada by the Civil Marriage Act enacted in 2005. Is this supported by the majority, or a minority, of the Canadian population. A poll conducted for the Globe and Mail newspapers in July 2005 of 1000 Canadians asked whether this bill should should stand or be repealed. The response were 55
Instructions In this project, examine if the two independent groups of participants obtained significantly different scores on the dependent variable in the data set. Additionally, examine the normality of distribution of scores, and the homogeneity of variance across the two independent groups. (1) Calculate a t-test for
Perform hypothesis testing on one variable's data. (Choose either the intrinsic or extrinsic column.) Perform a t-test by formulating a null and an alternative statement, choosing an acceptable significance value, determining the appropriate critical value, selecting the test statistic and determining its value from the sample d
A researcher has reason to be that, for an experiment with 50 points, a 95% prediction interval would be of width 4. If the researcher wishes to run a more precise experiment that will result in a 95% prediction interval of width 2, then the researcher will require: A) 200 points B) More than 200 points C) 50 po
1) SafeRoad Stores is redesigning the checkout lanes in its stores throughout the country. Two designs have been suggested. Tests on customer checkout times have been conducted at two stores where the two new systems have been installed. A summary of the sample data follows: System A System B Sample size
Please view the attached files. 1. Data File ERWAITING contains the waiting times in minutes for 15 randomly selected patients at a hospital main emergency room facility and at three satellite facilities. a. At the .05 level of significance, is there evidence that the mean waiting time at the main facility is more than o
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard devi
Martin Motors has in stock three cars of the same make and model. The president would like to compare the gas consumption of the three cars (labeled car A, car B, and car C using four different types of gasoline. For each trial, a gallon of gasoline was added to an empty tank, and the car was driven until it ran out of gas.
An estimated regression coefficient is 10 with a standard error of 5. The null hypothesis is that the partial regression coefficient equals one. What is the value of the t-statistic for testing the null hypothesis of the regression coefficient? A) 1 B) 2 C) 1.8 D) 0.5
There are four entrances to the Government Center Building in downtown Philadelphia. The building maintenance supervisor would like to know if the entrances are equally utilized. To investigate, 400 people were observed entering the building. The number using each entrance is reported below.
Exercise 23 A real estate agent in the coastal area of Georgia wants to compare the variation in the selling price of homes on the oceanfront with those one to three blocks from the ocean. A sample of 21 oceanfront homes sold within the last year revealed the standard deviation of the selling prices was $45,600. A sample of 18
The president of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies. He selects a sample of 15 families, some with only a single insured driver, others with several teenage drivers, and pays each family a stipend to contact the two companies and ask for a price q
Use the following information to answer questions: A manufacturer of automobile transmissions uses three different processes. The management ordered a study of the production costs to see if there is a difference among the three processes. A summary of the findings is shown below. Process 1 Process 2 Process 3 Total Proce
1. (10) The CEO for the Red White and Blue T-Shirt Company expects quality garments produced with a minimum of defective garments. Further, he expects the same quality work from his employees regardless of whether they work in the day or in the evening. To test productivity quickly, he has his shift foremen record the number
Jerry's Bargain Department Store spent $50,000 on a training program to improve sales effectiveness of its employees. Below is a table of the before and after sales amounts for a random sample of employees who took the training program. Assume that data is recorded for an equal period of "before"-"after" time. Use the 1% level f
A consumer watchdog organization wants to see whether Bank N in the northern part of a state has a higher default rate than Bank S in the southern part of that same state. Researchers for the group sample the proportion of defaults on loans at both banks. Out of 100 loans for Bank N, they find 30 have defaulted; out of 100 lo
Identifying H0and Hr in ex 5-12 , examine the given statement , then express the null hypothesis H0 and alternative hypothesis H1 in symbolic form. 6. The mean IQ of statistics students is at least 110. 8. The percentage of men who watch golf on tv is not 70%, as is claimed by the Madison Advertising Company. Finding C
1) Recall that "very satisfied" customers game system a rating that is at least 42. Suppose that the manufacturer of the XYZ- box wishes to use the 65 satisfaction ratings to provide evidence supporting the claim that the mean composite satisfaction rating for the XYZ=box exceeds 42. a) letting µ represent the mean composit
In testing the equality of the two means below, what is the test statistic? (Use the unequal variances formula) Sample 1 Sample 2 Sample size 9 12 Sample mean 80 115 Sample variance 550
Many elementary school students in a school district currently have ear infections. A random sample of children in two different schools found that 16 of 42 at one school and 21 of 36 at the other had this infection. At the .05 level of significance, is there sufficient evidence to conclude that a difference exists between the
Using the z table in Table E of Appendix C, determine the critical value for the left-tailed test with a = 0.02. A) 2.05 B) - 2.33 C) - 2.05 D) 2.33