A sample of scores on an examination given in a particular class are: Men Women 72 81 69 67 98 90 66 78 85 81 76 80 79 76 80 77 At the .01 significance level, is the mean grade of the women higher than that of the men? Set up the 5-step hypothesis testing proce
(See attached file for full problem description) --- A. Circle the correct answer. 1. The null hypothesis is a claim about a. the size of the sample. b. the size of the population. c. the value of a sample statistics. d. the value of the population parameter. 2. when the null hypothesis is rejected, we conclude that
A financial analyst wants to compare the turnover rates, I percent, for shares of oil-related stocks versus other stocks, such as GE and IBM. She selected 32 oil related stocks and 49 other stocks. The mean turnover rate of oil-related stocks is 31.4 percent and the standard deviation 5.1 percent. For the other stocks, the mean
How do I set this up using the five step hypothesis testing procedure? How do you state your decision and recommendation without using statistical jargon. The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. The standard dev
At the time she was hired as a server at the Grumney Family Restaurant, Beth Brigden was told, "You can average more than $20 a day in tips." Over the first 35 days she was employed at the restaurant, the mean daily amount of her tips was $24.85, with a standard deviation of $3.24. At the .01 significance level, can Ms. Brigden
The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. The standard deviation of the mileage is 5,000 miles. The Crosset Truck Company bought 48 tires and found that the mean mileage for their trucks is 59,500 miles. Is Crosset's
The Spanish patients, two men and two women, were elderly and very ill. All four had undergone routine dialysis at the Hospital de la Princesa. Soon after, they began sweating and vomiting, some of them in excruciating pain. They died within a few hours of receiving treatment. Nothing seemed exceptional about the deaths of t
Please help me with the attached cases. Thanks! (See attached file for full problem description) FROM THE ATTACHED FILE: Introduction 1. In their discussion of the literature on hostility as a risk factor for coronary heart disease (CHD),, Weeks and Waterhouse suggested that the relationship between hostility
Fairfield Homes is developing two parcels near Pigeon Fork, Tennessee. In order to test different advertising approaches, they use different media to reach potential buyers. The mean annual family income for 75 people making inquiries at the first development is $150,000, with a standard deviation of $40,000. A corresponding
A recent national survey found that high school students watched an average (mean) of 6.8 DVD's per month. A random sample of 36 college students revealed that the mean number of DVD's watch last month was 6.2, with a standard deviation of 0.5. At the .05 significance level, can we conclude that college students watch fewer DV
I have studied 3 similar methods for testing hypotheses about population means -- a 1-sample test, and 2 versions of a 2-sample test (independent samples, and dependent samples). What are the key conceptual differences between these 3 methods? In other words, under what conditions do we choose each method for our analysis,
1. Bi-lo Appliance Stores has outlets in several large metropolitan areas. The general sales manager plans to air a commercial for a digital camera on selected local TV stations prior to a sale starting on Saturday and ending Sunday. She plans to get the information for Saturday - Sunday digital camera sales at the various outle
A study of 20 worldwide financial institutions showed the correlation between their assets and pretax profit to be .86. At the .05 significance level, can we conclude that there is positive correlation in the population?
Your director has banned the use of all artificial fingernails, claiming their use contributes to patient infections in the unit. After multiple discussions the director has allowed you to do a research study to determine if the use of artificial fingernails causes increases in infection rates. You would really like to prove tha
Test the hypothesis that a population mean is 14 against the alternate that it is NOT 14. Use an alpha of 1%. A sample of 500 will be taken. The sample standard deviation is 6.4. The computed sample mean is 14.7356. ? Use the full, formal, hypothesis testing model. ? Calculate the p-value. ? State your conclusions both in
Lester Hollar is Vice President for Human Resources for a large manufacturing company. In the recent years hr has noticed an increase in absenteeism that he thinks is related to general health of the employees. Four years ago, in an attempt to improve the situation, he began a fitness program in which employees exercise during t
Each month the National Association of Purchasing Managers publishes the NAPM index. One of the questions asked on the survey to purchasing agents is: Do you think the economy is expanding? Last month, of the 300 responses 160 answered yes to the question. This month, 170 of the 290 responses indicated they felt the economy was
A board of directors at the Anchor Pointe Marina is studying the usage of boats among its members. A sample of 30 members who have bots 10 to 20 feet in length showed that they used their boats an average of 11 days last July. The standard deviation of the sample was 3.88 days. For a sample of 40 members with 21 to 40 feet in le
A recent study compared the time spent by single and dual-earner couples. According to the records kept by the wives during the study, the mean amount of time spent together watching television among the single-earner couples was 61 minutes per day, with standard deviation of 15.5 minutes. For the duel-earner couples, the mean n
A study by a fast food restaurant designed to determine whether there was a relationship between the importance a store manager placed on advertising and the size of the store revealed the attached sample information. Important Not Important Small 40 52 Medium 106 47
A construction company wants to determine if the likelihood of having an injury is related to the type of worker. Over the past decade the company has had an average total workforce of 2560 workers. On average 601 of these were tradesmen, 381 were apprentices and the rest were labourers. During that decade there was a total of 4
Answer the following question: a). Is this a one- or two-tailed test? b). What is the decision rule? c). What is the value of the test statistic? d). What is your decision regarding Ho? e). What is the p-value? Interpret it. The following information is available. Ho:u< 10 H1:u> 10 The sample mean is 12 for a sa
1. A z-test is to be performed for a population mean. Express the decision criterion for the hypothesis in terms of _X , That is, determine for what values of _X the null hypothesis would be rejected. A hypothesis test is to be performed to determine whether the mean waiting time during peak hours for customers in a supermarke
A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights. The traffic department claims that a modification in the type of light will reduce these accidents. The county commissioners have agreed to a proposed experiment. Eight intersections were chosen at random, and
The owners of the Franklin Park Mall wished to study customer shopping habits. From earlier studies the owners are under the impression that a typical shopper spends 0.75 hours at the mall, with a standard deviation of 0.10 hours. Recently the mall owners added some specialty restaurants designed to keep shoppers in the mall l
A stock analyst wants to determine whether there is a difference in the mean rate of return for three types of stock: utility, retail, and banking stocks. The following sample information is collected. Rates of Return Utility Retail Banking 14.3 11.5 15.5 18.1 12 12.7 17.8 11.1 18.2 17.3
Refer to the baseball appendix (see attachment) a. Conduct a test of hypothesis to determine whether the mean salary of the teams was different from $50 million. Use the 0.5 significance level. b. Conduct a test of hypothesis to determine whether the mean attendance was more than 2,000,000 per team.
A recent article in the Wall Street Journal reported that the prime rate for large banks now exceeds 9 percent. A sample of eight small banks in the Midwest revealed the following prime rates (in percent): 10.1, 9.3, 9.2, 10.2, 9.3, 9.6, 9.4, 8.8 At the 0.01 significance level, can we conclude that the prime rate for
The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart. The mean assembly time for a random sample of 24 carts, using the new method, was 40.6 minutes, and the standard deviation of the sample was 2.7 minutes. Usi
The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. The standard deviation of the mileage is 5,000 miles. The Crosset Truck Company bought 48 tires and found that the mean mileage for their trucks is 59,500 miles. Is Crosse