You want to know if there is a difference in price between imported and domestic beers. You go to your local supermarket and record the sales price and country of origin of 68 different beers. A t-test is run, the results of which appear below. Values Attached! 1.Why would it be better to use a one-tailed test in this
Two boats the prada (Italy) and the oracle (USA) are competing for a spot in the upcoming Americans cup race.
Two boats the prada (Italy) and the oracle (USA) are competing for a spot in the upcoming Americans cup race. They race over a part of the course several times. Below are the sample times in minutes at the .05 significance level. Can we conclude that there is a difference in their mean times? Prada (Italy) 12.9, 12.5, 11.0,
A recent study of 100 elementary school teachers in a southern state found that their mean salary was $32,100 with a standard deviation of $3,500. A similar study of 100 elementary school teachers in a western state found that their mean salary was $ 34,500 with a standard deviation of $3,200 Test the claim that the salaries of
Indicate the analytical approach and test stats that would be used to test your hypothesis on gas prices. 20 2.63 20 2.64 25 2.64 30 2.65 31 2.65 15 2.65 22 2.65 Column1 Column2 10 2.65 16 2.66 Mean 20.7 Mean 2.649 18 2.67 Standard Error 2.081932863 Standard Error 0.003480102
Find the test statistic, find the critical values of x2 and limits containing P-value, then determine whether there is sufficient evidenceto support the given alternative hypothesis H1: variance is not equal to 18, alpha = 0.05, n =25, s = 22 Determine the test statistic (round to nearest thousandth) Use a chi square tabl
Please see attached file for full problem description. A researcher wants an answer to the following question: Does the correlation of .34 between extracurricular activities and academic achievement represent a true relationship. The null hypothesis is there is no relationship between extracurricular activities and academic a
1. Based on a large number of recorded birth weights, the mean birth weight of babies born in the general population of the US is established at approximately 115 ounces. A sample of 50 birth weights was drawn randomly from the population consisting of all babies born to mothers who consumed two or more drinks per day during the
I'm not sure where to start. Please see attached file for full problem description. John Wood works as a ranger for the Texas state police force. Lately, he has noticed an alarming trend toward higher recidivism rates by criminals in several southwestern counties in Texas. Law enforcement agencies are concerned about the e
Please see attached file for full problem description and the data to do the hypothesis. Please show all work and write the analysis. Thanks Quick Stab Collection Agency (QSCA), is a bill-collecting agency. The company specializes in collecting small accounts. The marketing department has just suggested that QSCA adopt
A random sample of 85 utility stocks was taken to compare the amount of their annual dividends to the annualized yields of the dividends. The data are given in following Table (see attachment) a. Find the correlation coefficient. b. Can we conclude that the variables are positively associated within the population of a
Find the test statistic, p-value and critical value and state a final conclusion. Caim: The mean IQ score of statistics professors is less than 120 sample data: n=40, mean of the values in a sample = 117, assume that the standard deviation = 14 and the significance level = 0.05 Calculate the test statistic ( round to ne
Suppose a study is conducted to test the claim, at a 0.01 significance level, that less than 75% of college students spend less than $250 per semester on text books. A survey of 700 students found that 71% spent less than $250 per semester on texts List the claim using the P-value method Determine the p-value (round to fo
The waiting time to place an order at a branch of a fast-food chain during the lunch hour has had population mean of 3.55 minutes, with a population standard deviation of 1.1 minute. Recently, in an effort to reduce the waiting time, the branch has experimented with a system in which there is a single waiting line. A sample of
1. A random sample of 10 college students was drawn from a large University. Their ages are 22, 17, 27, 20, 23, 19, 24, 18, 19, and 24 years. What is the required condition to test to determine if we can infer that the population mean is not equal. What graphical device can you use to check to see if that required condition
You are the manager of a restaurant for a fast food franchise. Last month, the mean waiting time at the drive-through window, as measured from the time a customer places an order until the time the customer receives the order, was 3.7 minutes. The franchise helped you institute a new process intended to reduce waiting time. Yo
Do out-of-state motorist violate the speed limit more frequently than in-state motorists? This vital question was addressed by the highway patrol in a large eastern state. A random sample of the speeds of 2,500 randomly selected cars was categorized according to whether the car was registered in the state or in some other stat
Could you please provide assistance with the document I have attached? Thanks. 30. There are four auto body shops in a community and all claim to promptly serve customers. To check if there is any difference in service, customers are randomly selected from each repair shop and their waiting times in days are recorded. The o
How could I writa a hypothesis to determine whether the variances of two populations are equal?
There are four auto body shops in a community and all claim to promptly serve customers. To check if there is any difference in service, customers are randomly selected from each repair shop and their waiting times in days are recorded. The output from a statistical software package is: Summary Groups Count Sum Aver
10. The manager of a computer software company wishes to study the number of hours senior executives spend at their desktop computers by type of industry. The manager selected a sample of five executives from each of three industries. At the .05 significance level, can she conclude there is a difference in the mean number of hou
The bad debt ratio for a financial institution is defined to be the dollar value of loans defaulted divided by the total dollar value of all loans made.
Please see attached file for full problem description. 1) The bad debt ratio for a financial institution is defined to be the dollar value of loans defaulted divided by the total dollar value of all loans made. Suppose that a random sample of seven Ohio banks is selected and that the bad debt rations (written as percentages)
State DMV records indicate that of all vehicles undergoing emissions testing during the previous year, 70% passed on the first try. A random sample of 200 cars tested in a particular country during the current year yields 156 that passed on the initial test. Does this suggest that the true proportion for this country during the
1. For a specific confidence interval, the larger the sample size, the smaller the maximum error of estimate will be. T 2. An estimator is consistent if, as the sample size decreases, the value of the estimator approaches the value of the parameter estimated. ____ T/F 3. When we reject the null hypothesis, we are c
Find the critical t-value that corresponds to c = 0.95 and n = 16.
Type I and Type II Errors In this scenario, (1) formulate both a null and (2) research hypothesis and give an example of both a (3) Type I and (4) Type II error. Scenario: You are Supervisor or Research for Doggie Heaven Biscuit Company. Your scientists have developed a new dog biscuit for the treatment of doggie breath. I
Can you provide some pros and cons of using descriptive and inferential statistics to make managerial decisions.
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.
There are 4 questions in word file and 1 question in excel file. Please show all work. Thanks 5. 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 T
The following are the GMAT scores and the GPA's of a random sample of 6 students in a graduate school
You must first determine which type of test this problem requires: Is it: A two sample independent sample tests: z or t depending upon the size of the samples (> or < 30 - both must be) or a two sample dependent tests: z or t depending upon the size of the samples (> or < 30 - both must be) - most of our work here is with t
Please see attached file for full problem description. Please help with the areas in red, thanks! Frequency Hypothesis Test #4) Does it seem to you that people tend to be absent more on some days of the week than on others? Recently, a major biotechnology firm collected data with the hope of determining whether or not it
The average gasoline price of one of the major oil companies has been $2,25 per gallon. Recently, the company has undertaken several efficiency measures in order to reduce prices. Management is interested in determing whether their efficiency measures have actually reduced prices. That is, the alternative hypothesis is that