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. Using
Under what conditions would a manager wish to utilize hypothesis testing?
1. The following are the GMAT scores and the GPA's of a random sample of 6 students in a graduate school. During a "cram" weekend the students learned several GMAT applications. With a 0.05 level of significance did the GPAs increase? BEFORE AFTER
A national survey of restaurant employees found that 75% said work stress had a negative impact on their personal lives. A sample of 100 employees from a popular restaurant chain finds that 68 answer "Yes" when asked, "Does work stress have a negative impact on you personal life?" Is there a eason to believe the restaurant chain
(See attached file for full problem description) --- 1. The manager of the BiLo Supermarket in Mt. Pleasant, Rhode Island, sampled the following information on the number of times a customer visits the store during a month. The responses of 51 customers were. If EXCEL is used, please import the information into this test d
HI, I am having difficulty understanding statistics. I had just completed a paper in which I made a statistical comparison using gas prices in 1975 and 2006. The gas prices were in today's dollars. I need to do a small sample size statistic with the same info and I'm lost. Could you walk me through this with the 5 step hypoth
Drugstore.com was the first e-commerce company to offer Internet drugstore retailing. Drugstore.com customers were provided the opportunity to buy health, beauty, personal care, wellness, and pharmaceutical replenishment products over the Internet. At the end of 10 months of operation, the company reported that 44% of orders wer
AOL Time Warner Inc.'s CNN has been the longtime ratings leader of cable television news. Nielsen Media Research indicated that the mean CNN viewing audience was 600,000 viewers per day during 2002 (The Wall Street Journal, March 10, 2003). Assume that for a sample of 40 days during the first half of 2003, the daily audience was
Reis, Inc., a New York real estate research firm, tracks the cost of apartment rentals in the United States. In mid-2002, the nationwide mean apartment rental rate was $895 per month (The Wall Street Journal, July 8, 2002). Assume that, based on the historical quarterly surveys, a population standard deviation of s = $225 is rea
To determine confidence interval of mean and test if there is significant difference between means. See attached file for full problem description.
(See attached file for full problem description) a) In an experiment to determine the effects of drought conditions on a certain variety of potato, the following data on crop yield (g/plant) was obtained: TREATMENT SAMPLE SIZE MEAN YIELD STANDARD DEVIATION WATERED 6 376 78.4 UNWATERED 12 234 65.8 Does the data suggest
A) An iron foundry asserts that the mean weight of the castings it produces is 20.0 kg. The weights of a sample of 10- castings are: 19.8 20.3 20.6 21.1 19.3 19.6 20.1 20.8 21.1 21.3 Assuming that the weight of a casting has an approximately normal distribution, test whether or not the assertion is correct. b) The poli
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 price home size selling price
Fran's Convenience Marts are located throughout metropolitan Erie, Pennsylvania. Fran, the owner, would like to expand into other communities in northwestern Pennsylvania and southwestern New York, such as Jamestown, Corry, Meadville, and Warren. As part of her presentation to the local bank, she would like to better understand
1. The mean weight for a certain type of fish is known to be 28.0 ounces with a standard deviation of 2.5 ounces . A game warden catches and weighs 30 fish from a certqin pond to check if they are larger than the mean stated above. If the mean of the sample is 30.9 ounces is this evidence of a significantly larger population of
1.Why would you use a small sample to draw inference about a large population? Test of a single proportion: 2. What is the difference between a sample parameter (X-bar and s) and a proportion parameter (p)? Test of two populations, large sample size (z-statistics) 3. When would you use two population test with a larg
What are the 5 hypothesis steps? 1. 2. 3. 4. 5. 2. 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, an
I'm having difficulty understanding hypothesis testing. I need some assistance putting together a hypothesis test for comparing 1970s gasoline prices and 2006 gasoline prices. I need to find out if they are actually higher overall now as compared to 30 years ago. What formula should I use? And how should I put it into the five-s
Please see the attached file. --- Question 12 Choose the statement that best applies to the following example and SPSS output. Dana wishes to assess whether vitamin C is effective in the treatment of colds. To evaluate her hypothesis she decides to conduct a 2-year experimental study. She obtains 30 volunteers from u
The question asks the appeal of audiotapes for walking tours of eight major cities. The issue is if all the tapes are equally appealing, and what is distinctive about the p-value. SSTR = 7,102 SSE = 10,511 r = 8 ni = 20 MSTR = SSTR/(r-1) = 7102/7 = 1014.57 MSE = SSE/(n-r) = 10,511/(160-8) = 69.15 F(7,152) = 14.67
Two boats were tested for possible contenders in the American Cup Races. Ho: µ1- µ2 = 0 H1: µ1 - µ2 ne 0 where ne means "not equal" Is one boat faster on average, than the other?
Are Japanese managers more motivated than American managers? A randomly selected group of each were administered the Sarnoff Survey of Attitude Toward Life, which measures motivation for upward mobility. The scores are summarized below> (see chart in attached file). Referring to the table, suppose that the test statistic i
The table below compares the prices of two online grocery stores. (see attached table) Using the table, which of the following is the correct calculation of the t statistic needed to test the null hypothesis that there is no difference in the average price of items at the two stores? A. -0.011 B. -0.541 C. -1.746
Assembly line workers are randomly assigned to two groups with 21 workers in each group. Each group receives a different training program and then their scores on an assembly task are compared. The "F" statistic for the variance in the two groups is 0.178. Using a 0.05 level of significance, what are the critical values for rej
Let p1 represent the population proportion of U.S. Senate and Congress (House of Representatives) democrats who are in favor of a new modest tax on "junk food". Let p2 represent the population proportion of U.S. Senate and Congress (House of Representative) republicans who are in favor of a new modest tax on "junk food". Out of
1. For the data given, predict the sales when square footage is 2.6 and number of stores is 1950. 2. For the output interpret coefficient of determination and adjusted coefficient of determination, show how adjusted coefficient was calculated. 3. Identify p-values for the slopes. What do you conclude about significance of
1. _____ variation is the sum of explained variation plus the sum of unexplained variation. 2. The error term in the regression model describes the effects of all factors other than the independent variables on y (response variable). TRUE OR FALSE? 3. If we increase the number of independent variables in a multiple regre
2.A recent article in USA Today reported that a job awaits only one in three new college graduates. The major reasons given were an overabundance of college graduates and a weak economy. A survey of 200 recent graduates from your school revealed that 80 students had jobs. At the .02 significance level, can we conclude that a lar
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute. The quality-assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the .05 signi
Two hundred managers from various levels were randomly selected and interviewed regarding their concern about environmental issues. The response of each person was tallied into one of three categories: no concern, some concern, and great concern. The results were: Level of Management No Concern Some Concern Great