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# Hypothesis Testing

### Formulate and Test Hypothesis

A medical school claims that more than 32% of its students plan to go into general practice. It is found that among a random sample of 130 students, 46 of them plan to go into general practice. a. Formulate the hypotheses to test the medical school's claim. b. Test these hypotheses and draw a conclusion about the claim. Us

### Electricity consumption by single-family homes in two separate countries

A large public utility company wants to compare the consumption of electricity during the summer season for single-family houses in two counties that it services. For each household sampled, the monthly electric bill is recorded with the following results: (Note the italicized X below should have a line above it.) X \$115

### Statistics

A sample of 12 homes sold last week in St. Paul, Minnesota, is selected. Can we conclude that as the size of the home (reported below in thousands of square feet) increases, the selling price (reported in \$ thousands) also increases? Home Size Selling Home Size Selling (thousands Price (thousands of

### Is there evidence that the proportion of wine drinkers in the West who prefer the new white wine is larger than the corresponding proportion of wine drinkers in the East?

To market a new white wine, a winemaker decides to use two different advertising agencies one operating in the East and one in the West. After the white wine has been on the market for 8 months, independent random samples of wine drinkers are taken from each of the two regions and questioned concerning their white wine preferen

### Effect of birth control on exercise capacity

A physiologist wishes to study the effect of birth control pills on exercise capacity. Five female subjects who have never taken the pill have their maximal oxygen uptake measured during a treadmill session. The five subjects then take the pill for a specified length of time and their uptakes are measured again, as given below

### Identify each of the random variables as continuous or discrete. Find the expected value of the profit in a \$1,000 portfolio. Find the standard deviation of the profit. Find the probability that: No student at the table smokes. Make a control chart for the above data. Find the probability that the snowpack is less than 60 inches. Find a 99% confidence interval for the population mean duration of telephone calls initiated on cellular car phones. State the null and the alternate hypothesis. Compute the z or t value of the sample test statistic.

Problem 1) Identify each of the random variables as continuous or discrete. a) The number of cows in a pasture. b) The number of electrons in a molecule. c) The voltage on a power line. d) The volume of milk given by a cow per milking. e) The distance from Caper Canaveral to a point chosen at random in the Sea of

### Hypothesis testing to determine earnings in tips

At the time she was hired as a server, Beth 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 Beth conclude that she is earning an average of mor

### School of Public Health

Hypothesis testing and t-tests 1. A researcher randomly assigns subjects with hypertension to one of three drug doses, then measures the heart rate of each group after administering the drug. The purpose of the study is to see what effect the drug has on heart rates. What are the independent variable(s) and dependent variable

### Calorie Watchers

Calorie Watchers has low-calorie breakfasts, lunches, and dinners. If you join the club, you receive two packages meals a day. CW claims that you can eat anything you want for the third meal and still lose at least five pounds the first month. Members of the club are weighed before commencing the program and again at the end of

### Hypothesis Testing

(The table is the student's t values generated by Minitab Version 9.2. Do not show sketches) --- Statistics Problems#1 Marketing: Shopping Time - How much customers buy is a direct result of how much time they spend in the store. A study of average shopping time in a large national house ware store gave the following info

### How to write a research report using grounded theory

The topic I am treating now is based on using qualitative analysis based on grounded theory to investigate the topic "Mature student studying at University". Please could you shed some light on how to go about writing a report on this, especially on Abstract, introduction, Methods result/discussion section .

### Statistics - Required sample size for the automotive industry

(See attached file for full problem description) --- 1. Use the below data to compute the sample size required for the Automotive Industry 2. Describe the independent and dependent variables 3. Include final recommendations related to defining and explaining the problem and stating the hypotheses that will be tested ---

### Higher Taxes survey - Hypothesis Testing

Show all work. State H0 and H1 where appropriate. (Use a 95% confidence level unless another level is specified.) Answers must be with reasons Exhibit T1: According to a 1992 survey, a 40% of the American population would support higher taxes to pay for health insurance. A state government is considering offering a health i

### Hypothesis test

A medical board approved the average stay in the hospital for patients that have a particular operation as 6.0 days. However, the insurance company the claims that the average hospital stay for patients has been substantially longer than 6.0 days. To examine this claim a sample of 100 patients who had this operation in the last

### Hyopthesis testing and Z-Distribution

1. A new process has been implemented and it is stated to have an average cycle time of 120 seconds. A sample of 50 cycles yielded an average cycle time of 115 seconds, with a standard deviation of 2 seconds. A. Set up the null and alternative hypothesis B. Test your hypothesis using a level of significance of 0.05 A new proc

### The owner of Maumee Motors wants to study the relationship between the ages of a car and its selling price...

The owner of Maumee Motors wants to study the relationship between the ages of a car and its selling price. Listed on the attached worksheet is a random sample of 12 used cars sold at Maumee Motors during the last year. If we want to estimate selling price based on the age of the car, which variable is the dependent and whi

### PROBLEM SOLVING

(See attached file for full problem description) --- Deb is the owner and manager of Deb's Specialty Coffees and Desserts, a small Oregon firm that roasts coffee beans and retails bulk beans to grocery stores, as well as desserts targeted to health conscious consumers. Deb is curious as to whether her new publicity campaign

### Rejection Rate Hypothesis

It is suspected that the rejection rate for a plastic-cup-molding machine is dependent on the temperature at which the cups are molded. A series of short tests is conducted to examine this hypothesis with the following results: Temperature Total Production Number Rejected T1 150

### The Gibbs Baby Food Company wishes to compare the weight gain of infants...

The Gibbs Baby Food Company wishes to compare the weight gain of infants using their brand versus their competitor's. A sample of 40 babies using the Gibbs products revealed a mean weight gain of 7.6 pounds in the first three months after birth. The standard deviation of the sample was 2.3 pounds. A sample of 55 babies using

### Statistics Study Questions

(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

### Hyopthesis testing

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

### 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 experience different from that claimed by the manufacturer at the .05 significance level? Set this up using the five step hypothesis testing procedure and 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 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

### At what point does the possibility that an event is more than coincidence become obvious?

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

### Case: Hostile Attitudes and Coronary Prone Personality by Weeks and Waterhouse (1991) and related questions

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

### Hypothesis testing and Regression

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

### Hypothesis test

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

### Hypothesis test - expanding economy

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

### Hyopthesis testing

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

### Hypothesis Testing and Tests for Independence for a construction company

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

### Hypothesis testing question

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