Assuming that the population variances are equal for male and female Grade Point Averages (GPAs), use the following sample data to test whether the averages are different at the 0.05 level of significance. Male GPA's Female GPA's Sample Size 17
A test was conducted to determine whether gender of a spokesperson affected the likelihood that consumers would prefer a new product. A survey of consumers at a trade show employing a female spokesperson determined that 60 out of 200 customers preferred the product, while 72 of 180 customers preferred the product when a male sp
Given the following data from two independent samples, conduct a one-tailed hypothesis test to determine if the first sample mean is larger than the second sample mean, given a 0.05 level of significance. n1 =45 n2 = 36 xbar1=64 xbar2 = 60 s1=15 s2 = 12
Conduct a one-tailed hypothesis test given the information below. A certain brand of fluorescent light tube was advertised as having an average illumination life-span of 2,000 hours. A random sample of 64 bulbs burned out with a mean life-span of 1,970 hours and a sample standard deviation of 80 hours. With a 0.05 level of
Please solve the following problem using the 5 step procedure for hypothesis testing. A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02. For the October 26 evening showing of the same movie, for a sample of 25 purchases the
Please solve the following problem using the 5 step procedure for hypothesis testing. To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in. The first 25 papers showed a mean score of 77.1 with a standard deviation of 19.6,
Please solve the problem using the 5 step procedure for hypothesis testing. In a Texas study,researchers gave lovastatin to 2,325 people and an inactive substitute to 2,081 people (average age 58). After 5 years, 57 of the lovastatin group had suffered a heart attack, compared with 97 for the inactive pill. (a) State the
Jerry's Bargain Department Store spent $50,000 on a training program to improve sales effectiveness of its employees. Below is a table of the before and after sales amounts for a random sample of employees who took the training program. Assume that data is recorded for an equal period of "before"-"after" time. Use the 1% leve
A manufacturer of hard hats for construction workers is concerned about the mean and the variation of the forces its helmets transmit to wearers when subjected to a standard external force. The manufacturer desires the mean force transmitted by helmets to be 800 pounds (or less), well under the legal 1000-pound limit, and desir
For the following problems follow these steps a state the hypotheses and identify the claim b find the critical value(s) c compute the test value d make the decision e summarize the results Product sales distribution A company owner wishes to determine whether the number of sales o
Heights of baseball players A researcher wants to compare variances of heights in inches of major league players with those in the minor league baseball a sample 25 players from each league variances for heights of each league are 2.25 and 4.85 respectively. At α = 0.10, is there a significant difference between the varian
Please see the attached file.
A computer manufacturer is about to unveil a new, faster personal computer. The new machine clearly is faster, but initial tests indicate there is more variation in the processing time. The processing time depends on the particular program being run, the amount of input data, and the amount of output. A sample of 16 computer run
The Telecommunications industry achieved a more rapid increase in ROI during its initial 75 years in existence than the Oil & Gas industry achieved. Which business sector, Oil & Gas or Telecommunications, achieved the greater ROI as their relative business sector matured?" Assuming level of significance α= .05 3. Cal
Please help with the following problem. There are two Chevrolet dealers in Jamestown, New York. The mean weekly sales at Sharkey Chevy and Dave White Chevrolet are about the same. However, Tom Sharkey, the owner of Sharkey Chevy, believes his sales are more consistent. Below is the number of new cars sold at Sharkey in the l
A computer manufacturer is about to unveil a new, faster personal computer. The new machine clearly is faster, but initial tests indicate there is more variation in the processing time. The processing time depends on the particular program being run, the amount of input data, and the amount of output. A sample of 16 computer run
In a study of how managers attempt to manage earnings, researchers analyzed a sample of 515 earnings- management attempts from a survey of experienced auditors. The frequency of effects is summarized in the table shown. Research question: At α = .01, is the effect on earnings independent of the approach used? Current-Perio
A well-known automotive magazine took three top of the line mid size automobiles manufactured in the United States, test-drove them, and compared them on a variety of criteria. In the area of gasoline mileage performance, five automobiles of each brand were each test-driven 500 miles; the miles per gallon data obtained follow. U
Please use Excel to solve the statistics problem. It is EXTREMELY important that you use EXCEL and prepare a written discussion of problem to accompany the numerical calculations. You should attach the Excel file. A large candy manufacturer is concerned that the mean weight of their Chunky Chocolate Crisp bar is not greater t
An entrepreneur owns two hotels, one in the western region of a certain state and the other in the eastern region. He thinks that the average amount spent by guests for lunch at his Friendly Café-West is less than $34.50, the average amount spent for lunch by guests at his similar Friendly Café-East. A random sample of 100 l
1) How can you tell, from a verbal hypothesis statement, whether you are conducting a one-tailed or two-tailed test? 2) Suppose you were the manufacturer of a new and improved light bulb that you claim has an average service life more than twice the life of your nearest competitor's product. You want to test your product to b
Suppose the company that has produced "Get Slim X" now produces an even better diet pill. This new and improved version is called "Get Super Slim X." Health researchers say that the mean weight loss after taking this pill for six months should be 7 pounds. A random sample of 49 people, who want desperately to lose weight, tak
Given the Life expectancy data for the countries of the E.U., can we conclude that the mean Life Expectancy in the U.S. is greater than the mean Life expectancy in the E.U.? Bring to mind a real-world situation or problem that could be addressed using a single-sample t test. For this situation or problem: Clearly identif
Given the Life expectancy data for the countries of the E.U., can we conclude that the mean Life Expectancy in the U.S. is greater than the mean Life expectancy in the E.U.? ? Bring to mind a real-world situation or problem that could be addressed using a single-sample t test. For this situation or problem: o Clearly ide
See the attached file. Businesses are increasingly placing orders online. The Performance Measurement Group collected data on the rates of correctly filled electronic orders by industry (Investor's Business Daily, May 8, 2000). Assume a sample of 700 electronic orders provided the following results. See attachment for table.
The American Bankers Association collects data on the use of credit cards, debit cards, personal checks, and cash when consumers pay for in-store purchases (The Wall Street Journal, December 16, 2003). In 1999, the following usages were reported. In Store Purchase Percentage Credit Card= 22% Debit Card=
M&M/MARS, makers of M&M Chocolate Candies, conducted a national poll in which more than 10 million people indicated their preference for a new color. The tally of this poll resulted in the replacement of tan-colored M&Ms with a new blue color. IN the brochure "Colors," made available by M&M/MARS Consumer Affairs, the distribut
The standard deviation in the 12-month earnings per share for 10 companies in the airline industry was 4.27 and the standard deviation in the 12-month earnings per share for 7 companies in the automotive industry was 2.27 (Business Week, August 14, 2000). Conduct a test for the equal variances at a=.05. What is your conclusion
Media Matrix and Jupiter Communications gathered data on the time adults and the time teens spend online during a month (USA Today, September 14, 2000). The study concluded that on average, adults spend more time online than teens. Assume that a follow-up study sampled 26 adults and 30 teens. The standard deviations of the time
A study is performed in a large southern town to determine whether the average weekly grocery bill per four person family in the town is significantly different from the national average. A random sample of the weekly grocery bills of four person families in this town is given in the attached file. a. Assume that the national