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
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 out put from a statistical software package is Summary Gro
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,
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 the .
The Mac Burger 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 Mac burger that the mean waiting time was 2.75 minutes. At the .05 sig
A statistics teacher wants to see whether there is a significant difference in the variances of the ages between day students and night students. A random sample of 31 students is selected from each group. The data are given below. Test the claim that there is no difference in the variability of age between the two groups. Use s
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
CD camera produces a new camera that claims can take an average of at least 8 photographs per second. A test of 37 randomly selected cameras found a sample mean of 7.7 photos/sec. The population standard deviation is known to be 0.65 photos/sec. Does the sample data present sufficient evidence to reject the manufacturer's claim
The publisher of Golf Illustrated has found through past experience that 75% of its subscribers renew their subscriptions. The publisher selects a random sample of 200 subscribers and finds that 139 plan to renew their subscriptions. Does the sample data provide sufficient evidence to conclude that less than 75% of subscriber
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
4. Determine the p-value for each of the following hypothesis-testing situations: a. H0: p = 0.25 and Ha: p =/= 0.25; z test value = 1.84 b. H0: u> 13.5 and Ha: u < 13.5; t test value = -1.94 d.f. = 10
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
I am having problem figuring out how to complete the following problems. A college baseball coach read in a sports magazine that the average fastball speed of all the pitchers who competed last year in the college world series was 90.4 mph. The 16 pitchers who tried out for the school's team this year averaged 88.2 mph, and t
PiggyBank has narrowed its options down to two incentive plans: A. cash back when the consumer makes an online purchase; and B. cash back when the consumer makes a purchase at a clothing store. The bank doesn't know whether consumers would shop online more than at clothing stores. Information Experts has placed you in a grou
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
I need some assistance with the attached document. Thanks. 18. 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
How could I writa a hypothesis to determine whether the variances of two populations are equal?
1. Test the hypothesis that the treatment means are equal. Use the .05 significance level. Sample data is provided in the attachment. a. State the null hypothesis and the alternate hypotheses. b. What is the decision rule? c. Compute SST, SSE, and SS total. d. Complete an ANOVA table. e. State your decision regarding the n