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    Hypothesis Testing

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    relationship between political affiliation and amount contributed

    Refer to the following data. Political Affiliation Amount Contributed to Campaign $1-99 $100-999 $1,000 or more Republican 600 650 555 Democrat 900 880 645 Socialist 56 45 22 All others 29 25 21 a. The above set of data is an example of what? b. What makes this data non-parametric in nature? c. What test s

    Hypothesis Testing

    Research by the Illinois Banking Company revealed that only 10 percent of their customers wait more than five minutes to do their banking. Management considers this reasonable and will not add more tellers unless the proportion becomes larger than 10 percent. The branch manager at the Litchfield Branch believes that the wait i

    Significance Level and Hypothesis Testing

    Last year, television station WXYZ's share of the 10 P.M. news audience was approximately equal to, but not greater than, 25%. The station's management believes (and would like to claim for advertising purposes) that the current share is higher than last year's 25% share. In an attempt to substantiate this claim, the station s

    Hypotheses Testing Advertising Products

    A company that depends heavily on advertising for selling its products wants to know if its various advertising media have different effectiveness relative to the age of the customer. The company uses its warranty return cards to collect the following information: This is a table that lists type of advertisement first then it

    Statistic problem: Hypothesis Testing of running shoes

    Directions: Test the following hypotheses using the Traditional Method. You must show all the steps involved and the final statement must be phrased appropriately for the problem. A sports-shoe manufacturer claims that joggers who wear its brand of shoe will jog faster than those who don't. A sample of eight joggers is take

    Hypothesis Testing

    A statistician claims that the average score on a standardized test of students who major in psychology is greater than the average of students who major in mathematics. The results of the test, given to 50 students in each group, are shown below. Is there enough evidence to support the statistician's claim at a 1% level of si

    Test of hypotheses: At a level of significance of 2%, is there enough evidence to say the percentage has changed? At a level of significance of 1%, can the claim be rejected? At a level of significance of 5%, is there enough evidence to support the manager's claim?

    1. From past records, a hospital found that 37% of all full-term babies born in the hospital weighed more than 7 pounds 2 ounces. This year a sample of 100 babies showed that 23 weighed over 7 pounds 2 ounces. At a level of significance of 2%, is there enough evidence to say the percentage has changed? 2. A recent study s

    Probability distribution and hypothesis testing

    There are 4 entrances to a building in Philadelphia. The bldg maintenance super 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. At the .01 signficance level, is there a difference in the use of the four ent

    Null and Alternative Hypothesis

    Multiple Choice: All of the following are possible hypotheses surrounding nominal data except: a. The percentage of people favoring brand A is greater than the percentage favoring brand B. b. The average income of electricians exceeds the average income of carpenters. c. The number of households with term life insurance e

    Null and Alternative Hypothesis

    Given a two-tail test for the population mean, the null hypothesis contains a(n) __________ sign, and the alternative hypothesis contains a(n) ___________ sign. a. ¹, = b. =, ³ c. £, = d. =, ¹ Use the following information for questions 3 - 5. The Waterhole bar and grill decided to run a special offer of a fr

    2 True and False questions on hypothesis testing

    1) For any hypothesis test, if the value of a parameter being tested falls outside the confidence interval for the same level of a, the correct decision is to reject the null hypothesis. Is this True or False? 2) Irrespective of whether a two-tail or one-tail test is being conducted in order to compare two population means, t

    Null and Alternative Hypothesis

    The educational testing service (ETS) designs and administers the SAT exams. Recently the format of the exam changed and the claim has been made that the new exam can be completed in an average time of 120 minutes. A sample of 50 new exam times yielded an average time of 115 min. The standard deviation is assumed to be 2 minu

    Statistics help: Null and Alternative Hypotheses

    In an attempt to improve quality many manufacturers are developing partnerships with their suppliers. A local fast food burger outfit has partnered with its supplier of potatoes. The burger outfit buys potatoes in bags that weigh 20 lbs. It does not wish to accept underweight bags of potatoes. A sample of 40 bags shows an ave

    Null and Alternative Hypothesis

    10.21 An automobile company thinks that with new designs, it scars will last longer before having a problem. For this reason the company wishes to extend the warranty that comes with the vehicle in hopes of attracting more customers. Before making this change the idea is tested. Prior to the design changes, the cars lasted on th

    Null and Alternative Hypothesis

    A. A company is thinking about setting up an onsite daycare program for its employees. The CEO has stated that she will do so only if more than 80% of the employees favor such a decision. Set up the null and alternative hypothesis to be tested. b. You are a connoisseur of chocolate chip cookies and you do not think that N

    Null and Alternative Hypothesis

    A vending machine that dispenses coffee into cups must fill the cups with 7.8oz of liquid. Before selling the vending machine to a college or business, the company tests the machine to be sure it is dispensing an average amount of 7.8oz of coffee. A sample of 20 amounts is shown below. The amount of coffee dispensed is assumed

    Testing Hypotheses about a Population Mean

    Fast Service, a chain of automotive tune-up shops, advertises that its personnel can change the oil, replace the oil filter, and lubricate any standard automobile in 15 minutes, on the average. The National Business Bureau received complaints from customers that service takes considerably longer. To check the fast service claim,

    Testing a hypothesis on the age of death for presidents

    Test the hypothesis that there is no difference in the age of the death for the United States Presidents and Vice Presidents. (see attachment for full question) Here are the ages of death for Presidents and Vice Presidents A - Presidents: 67, 90, 83, 85, 73, 80, 78, 79, 68, 71, 53, 65, 74, 64, 77, 56, 66,

    Hypothesis Testing Impacts

    Problems are attached in word format. The questions are posted below to provide quicker review. Thanks, Q1) Does gender impact the use of electronic mail (e-mail)? An insurance company studied the use of e-mail in its organization by counting the number of business-related e-mails generated by 10 men and 10 women matched o

    Variable Interest Sample Identified

    The New York Stock Exchange (NYSE) consists of listing of approximately 1,500 companies, which offer shares of company stock to the public. Stockbrokers are interested not only in the individual stocks, but also in general trends established by the market as a whole. They often base inferences upon the daily closing prices of

    Hypothesis Testing , Normal Distribution

    1) Hypothesis Testing A. For the statement: The mean amount of Pepsi in cans is at least 12 oz. Express the null hypothesis and the alternative hypothesis in symbolic form. B. Find the z value for the following : The claim is u(mu) =12, and the sample statistics include n =36, xbar = 12.19 and s = .11 C. Determine whether

    Hypothesis Testing: Null and Alternate Hypotheses, P Value

    Four Hypothesis Testing problems Problem 10.17: M&M/Mars claims that at least 20% of the M&M's in each package are the new blue color. Set up the null and alternate hypotheses to test this claim. Problem 10.18: The computer center at a university claims that the average amount of time that students spend on-line has incre

    Hypothesis Testing Actual Means

    5. In the past it took Kim 148.4 seconds to swim 200 meters. Kim wants to know if her average has changed. She records her time on 50 randomly selected occasions and computes the mean to be 147.8 seconds with a standard deviation of 2.3 seconds. a. Perform the appropriate test of hypothesis to determine whether Kim's average t

    Statistics - Correlation Coefficient and Hypothesis Testing

    Please provide step by step instructions on how to solve the following problems using actual numbers provided. Thanks 1) A student representative claims that 60% of the students favor a move to division 1. A random sample of 250 students were selected and 140 of them indicated they favored a move to division 1. a. Perform

    Hypothesis Testing- 508

    A. Attitude change is thought to result from the anxiety produced under conditions of cognitive dissonance. The data below represent the anxiety scores of subjects in a dissonance study. Assuming that anxiety is distributed with mean=10 and standard deviation=2 test whether this sample exhibited more anxiety than would be expect

    Using proportional relationships.

    Assume that male snakes of a particular species are all scaled versions of the same basic shape. (i) (a) Describe in words the sort of relationship that you might expect there to be between the volume and the length of a snake. What relationship would you expect there to be between the mass and the length of a snake ?.

    Confidence Interval of True Proportion

    A U.S. Travel Data Center survey of 1500 adults found that 42% of respondents stated that they favor historical sites as vacations. Find the 99% confidence interval of the true proportion of adults who favor visiting historical sites as vacations.

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