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# Hypothesis Testing

### Hypothesis Testing: With a 0.05 level of significance, can we conclude that the mean age of the workforce has declined?

A big multinational corporation based in Toronto recently moved it's production facilities to Mexico. When the corporation was in Toronto, it had an older, experienced labour force with a mean age of 45 years. Now that it has moved to Mexico, the company wishes to find out if the average age of the workforce has declined. A samp

### Bounce Back

The makers of Bounce Back glass backboards for basketball gymnasiums have claimed that their board is at least as durable, on the average, as the leading backboard made by Swoosh Company. Products Testing Services of Des Moines, Iowa, was hired to verify this claim. It selected a random sample of 50 backboards of each type and s

### Inferential statistics /3073

Employer A states the average number of days missed in a year by each staff member is 4.0. Office personnel randomly sampled a portion of their attendance records to determine if this claim was accurate. For the previous year, the following data was obtained from the sample group, regarding absences for that year: 4, 4, 3, 2, 6,

### Hypothesis for Cereal Box Sellers

A cereal manufacturer sells boxes of cereal that list the weight as 19 oz. A random sample of 60 boxes was taken, with the contents carefully weighed. Assume a mean weight of (random variable?) x = 19.9 oz. and a standard deviation of s = 0.67 oz. resulted from the sample data. would this idicate that the actual mean weight,u of

### Conduting a test of hypothesis

A national car insurance company stated that in 1987, the average yearly car insurance cost for a family in the U.S. was \$931. In the same year, a random sample of 39 families in california resulted in a mean cost of X = \$975 with a standard deviation of = 30.50. Does this suggest that the average insurance cost for a family in

### Statistic problem- hypothesis

A nectarine-packing firm claims that the nectarines they ship have a mean weight of 5.22 ounces. A test on n = 10 randomly selected nectarines, gave the following results, in ounces: 5.94 5.15 5.73 6.31 5.63 5.04 5.10 5.03 5.13 5.21 Do the data indicated that the actual mean weight is less than the mean weight claimed by t

### Z-test on 52 sample to determine p-value and validate conclusion

Please see the paper enclosed. Perform a Z -test on a 52 sample class (26 samples in the paper + 26 samples in the 2nd attachment), and determine the p-value to validate the conclusion (decision). Please perform all the calculations similar to how it was done in the paper meaning not just giving me the result number but show

### Significance Level: Fairfield Homes

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 sam

### Estimate the p-value

The management of Discount Furniture, a chain of discount furniture stores in the Northeast, designed an incentive plan for salespeople. To evaluate this innovative plan, 12 salespeople were selected at random, and their weekly incomes before and after the plan were recorded. Sales Person Before After Sid Mahone \$320

### Ms. Lisa Monnin is the budget director for the New Process Company. She would like to compare the daily travel expenses for the sales staff and the audit staff. She collected the following sample information. Sales \$ 131 135 146 165 136 142 Audit \$ 130 102 129 143 149 120 139 At the .10 significance level, can she conclude that the mean daily expenses are greater for the sales staff than the audit staff? What is the p-value?

Ms. Lisa Monnin is the budget director for the New Process Company. She would like to compare the daily travel expenses for the sales staff and the audit staff. She collected the following sample information. Sales \$ 131 135 146 165 136 142 Audit \$ 130 102 129 143 149 120 139 At the .10 significan

### Decision rule, p-value

A sample of 65 observations is selected from one population. The sample mean is 2.67 and the sample standard deviation is 0.75. A sample of 50 observations is selected from a second population. The sample mean is 2.59 and the sample standard deviation is 0.66. Conduct the following test of hypothesis using the .08 significanc

### 3 different hypotheses statements based on the persived results of the survey

Using the enclosed survey (customer satisfaction survey for Hitachi Automotive products - enclosed), create at least 3 different hypothesis statements based on the perceived results of the survey. State both the null and alternative hypotheses for each hypothesis statement.

### Important information about Testing hypotheses of population mean

A recent article in theWall 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 .01 significance level, can we conclude that the prime rate for small banks als

### Standard deviation, significance

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

### Significance level

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

### The source of the statistics, the use of the statistics....

The article "The Age of Discontent" could be found at http://www.robertkotlermd.com/latimes.htm From the information that is provided in the article, identify the source of the statistic, the use of the statistic, and decide if the statistic might be misleading (and why or why not). Report the findings in 350-500 words.

### Hypothesis Testing

FIRST In 1990, 5.8% of job applicants who were tested for drugs failed the test. At the 0.01 level, test the claim that the failure rate is not lower if a random sample of 1520 current job applicants results in 58 failures. Work and steps must be shown. Write each step of hypothesis procedure SECOND The expense of movi

### hypothesis test - bottling machine functioning properly

Bubble Bottling Co. is operating an old machine that fills each one-liter plastic bottle of soda prior to capping. The average fill seems O.K., but the operator has reported lately that too many bottles seem either too full or too empty coming off the line. The problem, of course, could be the variation in the capacity of the bo

### What is a hypothesis test for the difference in two population proportions?

What are the requirements for applying the hypothesis test for the difference in two population proportions? What are the calculations (computations)?

### How is hypothesis testing utilized for business research?

How is hypothesis testing utilized for business research?

### The Five-step Process for Hypothesis Testing

The response to the question: "What is the five-step process for hypothesis testing? Is the order important? Why or why not?"

### The Waterhole bar and grill

Please see the attached file for full problem description. 1. Use the following information for questions a-b. The Waterhole bar and grill decided to run a special offer of a free fried zucchini appetizer with the purchase of a pitcher of beer and a sandwich for Monday nights only during the height of the baseball season. A

### Test the claim that each bag of the farmers potatoes are 60 pounds?

Problem: A farmer sells sacks of potatoes at a county fair. Each bag is labeled 60 pounds. The fair organizers employ a statistician to verify that all business is conducted accurately. The statistician selects 50 sacks of the farmer's potatoes and finds a sample mean of 57 pounds. The standard deviation is 8 pounds. Test the cl

### Statistics - Hypothesis testing - 2499

As a part of a survey on the use of Office Suites Software, the company doing the polling wanted to know whether its population was uniformly distributed over the following age distribution... Based on the data, do you think that the respondents are uniformly distributed over the age categories? (see attachment for full questi

### Alternative Hypothesis on Credit Card Benefits

The Thompson's Discount Appliance Store issues its own credit card. The credit manager wants to find whether the mean monthly unpaid balance is more than \$400... (see attachment for full question) The Thompson's Discount Appliance Store issues its own credit card. The credit manager wants to find whether the mean monthly u

### Statistics

T F 1. If the null hypothesis is stated that the average number of milligrams of sodium in a manufacturer's can of soup is 200 mg, an appropriate alternative hypothesis is that the average number of milligrams of sodium exceeds 200 mg. T F 2. If a null hypothesis is tested and rejected at the a = 0.05 level, the same null hypot

A study of tobacco quitting was done. The authors concluded that a significant preictor of maintaining cessation was forbidding smoking in the house, and gave the following supportive statistics: OR 1.95; C.I. 1.05-3.6; p<0.01 What is the exposure? What is the outcome? What does OR stand for? What does CI stand for? St

### Durbin Watson (d) Test

1(a) The Durbin Watson (d) statistic is defined as (see attached) Where u t is the OLS residual. Explain what hypothesis d tests. (b) Show that if the null hypothesis is true, d is approximately equal to 2. (c) The following equation was estimated by OLS on UK quarterly data Ct = − 370.87 + 0.916YDt + u t t = 1,

### Hypothesis - testing

I. The Dean of Students is interested in how long students spend commuting to school each day because the administration has been considering building dormitories. Since this college is highly selective and draws students from all the boroughs as well as the surrounding areas. A study was undertaken to see if the travel time is

### Hypothesis testing

1) The FMA Company has designed a new type of 16 lb. bowling ball. The company knows that the average man who bowls in a scratch league with the company's old ball has a bowling average of 155. The variance of these averages is 100. The company asks a random sample of 100 men bowling in scratch leagues to bowl