1. Periodically, Merrill Lynch customers are asked to evaluate Merrill Lynch financial consultants and services (2000 Merrill Lynch Client Satisfaction Survey). Higher ratings on the client satisfaction survey indicate better services, with 7 the maximum service rating. Independent samples of service ratings for two financial co
Birdie Golf Equipment Birdie Golf Equipment is a major manufacturer of golf equipment. Management believes that that Birdies market share could be increased with the introduction of a new cut-resistant, longer-lasting golf ball. Therefore, the research group at Birdie has been investigating a new golf ball coating designed
6 problems : Microwave Repair Costs, Gas Mileage, Do You Eat Breakfast? Do Free Samples Work? Physical Science Assessment Tests, Salaries
23. Microwave Repair Costs A microwave oven repairer says that the mean repair cost for damaged microwave ovens is less than $100. You work for the repairer and want to test this claim. You find that a random sample of five microwave ovens has a mean repair cost of $75 and a standard deviation of $12.50. At a = 0.01,do you have
Using our data set from Unit 1, compose an email to the head of the American Intellectual Union which discusses the following: Begin your email to AIU by first providing an overview of the database, i.e. a story. Be sure to include information about how you would use the concept of probabilities to apply to profiles for
What are the steps in formal hypothesis testing? Make at least two explanatory comments about each step.
4. A survey was conducted to compare the proportion of male and female adults, 25 years or older, who have completed four or more years of college. It was found that among 350 females, 100 completed four or more years of college, and among 400 males, 115 completed four or more years of college. At sigma = 0.02, is the proportion
A machine is adjusted so that when under control, the amount of sugar filled in a bag is normally distributed with a mean amount of 5 pounds. To check if the machine is under control, six bags were picked at random and their weights (in pounds) were found to be as follows: 5.3, 5.1, 4.9, 5.4, 4.9, 5.3 At the 5% level of signif
What test of differences is appropriate in each of the following situations and why ? (a) Average campaign contributions of Democrats, Republicans, and Independents are to be compared. (b) Managers and supervisors have responded "yes," "no," or "not sure" to an attitude question. Their answers are to be compared. (c) On
Formulate a hypothesis statement regarding the research issue. Perform the five-step hypothesis test on the data. Explain which non parametric test you used to analyze your data and why you choose that test. Interpret the result of your test. My null hypothesis is the salary of baseball players does not depend on the
Please help with the following problem. Question: A new car is designed to run a mean of at least 50 000 kilometers before its first tune-up. Tests with 30 cars show a sample mean of 49 500 kilometers and a sample standard deviation of 1000 kilometers. a. Develop the null and alternative hypotheses most appropriate fo
A candidate must gather at least 8,000 valid signatures on a petition before the deadline in order to run in an election. One candidate turns in 10,000 signatures right before the deadline, but it's always expected that some percentage of them are invalid. Elections officials take the random sample of 100 signatures and thorough
Market researchers would like to know if customers prefer a well-known brand over a generic brand of soft drink. They give a large sample of people the two drinks to taste in a random order and ask them which one taste better. They find that 70% of people say the branded one and researchers compute a p-value of .02. Interpret th
Over the last year the absentee rate at a large corporation averaged 8.2 days absent with a standard deviation of 6 days. One department with 40 employees had an absentee rate of 12 days per employee. During an investigation the department head argued as follows "if you took 40 employees at random from the corporation, there is
a. State the hypotheses and identify the claim b. Find the critical value c. Compute the test value d. Make the decision e. summarize the results and explain where the differences in the mean are Question # 1 Number of State Parks The number of state parks found in selected states in three different regions of the country
13 statistics review questions: confidence intervals, sampling, hypotheses, Type I and Type II errors
1. An appropriate 95% confidence interval for mu has been calculated as (- 0.73, 1.92) based on n = 15 observations from a population with a normal distribution. The hypotheses of interest are H0 : mu = 0 versus Ha: mu <> 0. Based on this confidence interval ... 3. An analyst, using a random sample of n = 500 families, obtai
14. Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking?even if they are not exposed to the usual pattern of sunlight. To test this notion, eight paid volunteers were placed (indiv
DATAS ATTACHED ? Two or More Sample Hypothesis Testing Paper Use the numerical data from one of the data set ? Develop one business research question from which you will formulate a research hypothesis that will test two or more populations. o Formulate both a numerical and verbal hypothesis statement regarding your rese
The solution provides step by step method for the calculation of test statistic for a number of hypothesis testing problems . Formula for the calculation and Interpretations of the results are also included.
II Solve each problem below. Be sure to show essential calculations. 11. The following statements refer to the alternate hypothesis. In the space provided, in symbolic form using H0, and H1 , write the null and alternate hypothesis. a. The mean pulse of lawyers is different from 90 beats per minute. H0: ____________________
You are trying to get an important new customer to buy a product that you produce. Their decision to buy depends on the speed at which you can produce the product once they have placed the order. Currently it takes you 70 hours on average to produce the product with a standard deviation of 8 hours. From historical data you have
What are the factors that determine the choice of the appropriate statistical technique?
10.30 In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents, while the fleet of yellow fire trucks made 135,035 runs and had 4 accidents. At alpha = .01, did the yellow fire trucks have a significa
Consider the following hypothesis test: H0: u>= 1.25 Ha: u< 1.25 A sample of 49 provides a sample mean of 1.19 and a previous population standard deviation of 0.14. Answer the following questions: a. At a=0.01, what is the critical value? b. Compute the value of the test statistic t. c. What is the p-value? d.
An automobile manufacturer stated that it would be willing ot mass produce electrically powered cares if more than 30% of potential buyers indicate they would purchase the newly designed electric cars. In a sample of 500 potential buyers, 160 indicated they would buy such a product. Should the manufacturer produce the new elec
A sample of 64 account balances from a credit card company showed an average balance of $1,040. A previously determined population standard deviation is $200. Test to determine if the mean of all account balances is significantly different from $1,000. Use a 0.05 level of significance. (may use traditional or p-value method)
11. In order to test to see if there is any significant difference in the mean number of units produced per week by each of three production methods, the following data were collected: Method I Method II Method III 182 170 160 170 192 156 185 190 179 a. Compute the overall sample mean . b.
52. 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 p
31. A new weight-watching company, Weight Reducers International, advertises that those who join will lose, on the average, 10 pounds the first two weeks with a standard deviation of 2.8 pounds. A random sample of 50 people who joined the new weight reduction program revealed the mean loss to be 9 pounds. At the .05 level of sig
The following information is available. H0: 10 H1: > 10 The sample mean is 12 for a sample of 36. The population standard deviation is 3. Use the .02 significance level. (a) State the null hypothesis and the alternate hypothesis. (b) State the decision rule. (c) Compute the value of the test statistic. (d) What is your
Candies manufactured by Cherrie Chocolate Candies Co, are supposed to weigh at least 2.00 ounces. A sample of 100 candies yields the following results. Sample mean: 1.98 ounces Sample standard deviation: 0.10 ounces Does the sample data present sufficient evidence to conclude that the average weight is in fact less than 2.0
The president of Crooked Arrow National Bank wants to determine whether more than 60% of the banks loans are made to persons residing in Crooked Arrow. A random sample of 500 loans is selected with 320 being made to persons residing in Crooked Arrow. a. Does the sample data provide evidence to conclude the more than 60% of th