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Hypothesis Testing

Statistics Review - Multiple Choice - Analysis of variance

1. Variance is... A. The average of the squared deviation from the mean. B. A measure of variability of data values about the mean. C. A measure of dispersion. D. All of the above. F. None of the above. 2. Analysis of variance means... A. We compute the variances of the variables observed in the study.

Testing of hypothesis for proportion

1-Testing for categories with different proportions. Here are the observed frequencies from four categories; 5,10,10,20. Assume that we want to use a 0.05 significance level to test the claim that the four categories have proportions of 0.20, 0.25, 0.25and 0.30, repectively a. What is the null hypothesis? b. What are the expec

Computer-interactive Data Analysis

1-Refer to the table below (Computer-interactive Data analysis) that lists the number of years that U.S president and popes and British monarch (since 1690) lived after their inauguration, election, or coronation. Determine whether the survival times for the three groups differ. See attachment for data. 2q-Archaeology: Skull

Determine whether there is differences among four tire brands

A Tire Company must determine which of four tire brands supplies the most amount of tire wear. It has been decided that all four tires are to be placed on each of eight cars. This design should allow us to compare tires without having differences in cars affect the comparison. Determine whether there is differences among the

Testing Procedures and Five-Step Hypothesis Testing

Need Help with the following exercises: I have attached the five-step hypothesis testing procedure 14. The null and alternate hypotheses are: H0: 1  2 H1: 1  2 A random sample of 15 observations from the first population revealed a sample mean of 350 and a sample standard deviation of 12. A random sample of 17 obse

T-tests , significance and variance

Refer to the real estate data which report information on the homes sold in Denver Colorado year at: http://highered.mcgraw-hill.com/sites/0073030228/student_view0/index.html .A. At the .05 significance level can we conclude that there is a difference in the mean selling price of the homes with a pool and hoes without a

Hypothesis testing problems - The Rocky Mountain

The Rocky Mountain district sales manager of Rath Publishing, Inc., a college textbook publishing company, claims that the sales representatives make an average of 40 sales calls per week on professors. Several reps say that this estimate is too low. To investigate, a random sample of 28 sales representatives reveals that the

Hypothesis test of a proportion

Please review the attached problem and help. A department store manager claims that at least 45% of persons who visited this store make a purchase. In a sample of 400 persons who visited the store 150 made a purchase. Test the manager's claim at the 3% significance level. a. State the null and alternate hypothesis. b. D

Z-test

Can you assist me in putting together a z test using the information below ... or if we use a different example? Due to increase in product demand, management needs to increase labor production hours by an estimated 270 hours. Any-Business currently has 30 production employees whose hourly wages varies from $7.50 - $8.50 per

P-Value Census

A 1990 census report revealed that the mean distance that U. S. citizens live from their birthplace is 50 miles and that the standard deviation is 15 miles. A random sample of 49 residents of your city yielded a mean distance of 56 miles. a. Set up the null and alternative hypotheses to test if the mean distance from residen

Risk of Drinking Water

In 1854, John Snow, a medical doctor hypothesized that there was a relationship between drinking water supply and cholera in London. The two major companies that supplied water to homes in London both got their water from the Thames River which runs through the city. The Lambeth Company pumped from upstream of London. The Southw

Two-Sample Tests of Hypotheses

Suppose you were the manufacturer of a new and improved light bulb that you claim has an average service life more than twice the life of your nearest competitor's product. You want to test your product to be sure. You test 500 of your bulbs in the lab and find that the average life of your bulbs is 2021 hours. Your competitor c

Statistics- Level of Measurement, parametric (P) or non-parametric (NP).

For the following questions, identify the level of measurement and whether the method to be used for the problem would parametric (P) or non-parametric (NP). Description of Problem a. From a written survey where the respondents were asked to rate an individual on a scale of 1 to 5, one group rated an individual a 3.7, anothe

Hypothesis testing problems

Work should be done in EXcel Refer to the Wage data which report information on the annual wages for a SAMPLE OF 100 WORKERS. ALSO INCLUDED ARE VARIABLES RELATING TO THE INDUSTRY, YEARS OF EDUCATION, AND GENDER FOR EACH OTHER WORKER.(data can be found at http://highered.mcgraw-hill.com/sites/0073030228/student_view0/inde

The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute. The quality-assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?

The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute. The quality-assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the .05 si

Hypothesis Testing: Example Problem

Refer to the Baseball 2005 data set(just 46) at, which report information on the 30 major League baseball teams for the 2005 season. (See attachment). Can also be found at: http://highered.mcgraw-hill.com/sites/0073030228/student_view0/index.html a. Conduct a test of hypothesis to determine whether the mean salary of th

Multiple choice question from hypothesis testing

In chronological order, state the 5 steps of the standard procedure for hypothesis testing: 1. 2. 3. 4. 5. Except as directed, check the single best answer. 6. Which of the following could be a valid null hypotheses? A. &#956; &#8805; 27.9 B. &#956; < 27.9 7. Which of the following can be reject

Null Hypothesis

Please use Excel-----In addition, to showing printouts, state the results of the hypothesis test in terms of the question using complete sentences and examples( I did the other 3?but was'nt so sure about these). 1. The Mac burgher restaurant chain claims that the mean waiting time of customers for service is 3 minutes and a

One sample Hypothesis - testing proportions

A recent article in USA Today reported that a job awaits only one in three new college graduates. The major reasons given were an overabundance of college graduates and a weak economy. A survey of 200 recent graduates from your school revealed that 80 students had jobs. At the .02 significance level, can we conclude that a large

Decision Rule and Test Statistics

16. Given the following hypothesis: ho:µ=400, h1: µ&#8800;400 For a random sample of 12 observations, the sample mean was 407 and the sample standard deviation 6. Using the .01 significance level: 1. State the decision rule. 2. Compute the value of the test statistic. 3. What is your decision regarding the null hypothes

Statistics - Hypothesis Testing Questions Responses

See attached file for full problem description. 1. In city D, 141 of the 300 randomly selected customers were aware of product; whereas in city O, 125 of 250 randomly selected consumers were aware of the product. Based on these data, the 95% margin of error is .084 or 8.4%. a. form the 95% confidence interval of the differen

Ethics is Statistics

Explain how important it is to report your data honestly and not manipulate the data in an attempt to prove your hypothesis. In addition, explain why it is important to ensure that your participants understand fully the extent of the research before you begin.

Hypothesis Testing: Evaluating the P-Value

Question: Determine the p-value for each of the following hypothesis-testing situations: a. H0: p = 0.25 and Ha: p does not = 0.25; z test value = 1.84 b. H0: u >/= 13.5 and Ha: u < 13.5; t test value = -1.94 d.f. = 10

Perform hypothesis testing on one variable's data.

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, selecting the test statistic and determining its value from the sample data, comparing the observed value to the cri

Point Estimate of the Population Mean and Margin of Error

How do I calculate the point estimate of the population mean and the margin of error for a 90% confidence interval. If I were given the example of lengths of running distances for 30 people (miles), such as 12, 18, 20, 15, 6, 8, 9, 10, 2, 1, 12, 33, 20, 18, 15, 15, 6, 9, 9, 10, 10, 12, 22, 24, 6, 7, 8, 8, 9, 10.

Two probability and hypothesis testing questions

Question 5: The weight of bags "checked in" is normal, with a mean of 30 pounds and a standard deviation of 9 pounds. a) What is the probability that a randomly selected bag will weigh more than 48 pounds? b) What is the probability that the total weight of 4 bags will be more than 192 pounds? c) Find the probability th

formal 5-step hypothesis testing model

An associate asks for your help in deciphering the following Anova table, indicating that a test of means was performed on the average age of people at three different locations. Unfortunately the person leaves before you can get any further explanation or detail, but you know the results must be presented before senior staff w

Compare insurance amounts and customer satisfaction among BankTen customers

See attached data file. Before you write your report for Cindy, use the Customer Data template in Materials below to work with the data, as follows: Estimate the total market size of the insurance business for the target population (i.e., estimate the total dollar volume of the insurance business done by the entire popula