On Friday, Wall Street traders were anxiously awaiting the federal government's release of numbers on the January increase in nonfarm payrolls. The early consensus estimate among economists was for a growth of 250,000 new jobs (CNBC, February 3, 2006). However, a sample of 20 economists taken Thursday afternoon provided a sampl
Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the Midwestern town of Webster City showed a sample mean annual consumption of 24.1 gallon
You're trying to explain null and alternative hypotheses to one of the senior managers at Company W and he's not "getting it" when you use snack food sales. Help him by thinking about a business problem in another organization or department. Formulate a null hypothesis and the corresponding alternative hypothesis that could be t
'Does mental health play a role in physical health?' 1. Briefly remind us of the two variables in your correlation and the operational definition of each. 2. State the null hypothesis and the alternative hypothesis (be sure to clearly label each one) for your correlation. 3. Explain what it would mean if we rejected the nu
Scenario 1 The vice president of operations for a veterinary supply company has designed a new quality control process that she believes will significantly reduce the reject rate in the packing line for bottles of equine glucosamine from its historical level of 32 units per 1,000. She now wants to implement a pilot of this pr
Use the traditional method to test the given hypothesis. Assume that the population is normally distributed and that the sample has been randomly selected. In one town, monthly incomes for men with college degrees are found to have a standard deviation of $650. Use a 0.01 significance level to test the claim that for men with
Identify the null Hypothesis, alternative hypothesis, test statistic, P-value, conclusion about null hypothesis, and final conclusion that address the original claim. Various temperature measurements are recorded at different times for particular city. The mean of 20 C is obtained for 40 temperatures on 40 different days. Ass
Test H0: pi1- pi2 <=0, HA: pi1- pi2 > 0 at alpha =.05 and 0.10 where p1=.08, p2=.05, n1 = 200 and n2 = 400. Indicate which test you are performing; show the test statistic and the critical values, and mention whether the test is one-tailed or two-tailed. Note that pi stands for the Greek letter representing population proport
Historically the average age of European soccer players is reported as 26 years with a standard deviation of 4 years. A random sample of 81 European professional soccer players has an average age of 27 years. We would like to decide if there is enough evidence to establish that average age of European soccer players has increase
1. Please give at least 4 example Hypothesis (and NULL) that should be tested for the attached survey, and explain why? Please note the questions on the survey are based upon surrounding the following six factors: ***Uncertainty Avoidance ***Individualism vs. Collectivism ***Power Distance ***Paternalism ***Masculinity
According to a recent study, when shopping online for luxury goods, men spend a mean of $2,401, whereas women spend a mean of $ 1,527. (Data extracted from R. A. Smith, " Fashion Online: Retailers Tackle the Gender Gap," The Wall Street Journal, March 13, 2008, pp. D1,D10.) Suppose that the study was based on a sample of 600 m
The Department of Economic and Community Development (DECD) reported that in 2009 the average number of new jobs created per county was 450. The department also provided the following information regarding a sample of 5 counties in 2010.
The Department of Economic and Community Development (DECD) reported that in 2009 the average number of new jobs created per county was 450. The department also provided the following information regarding a sample of 5 counties in 2010. County New Jobs Created In 2010 Bradley 410 Rhea 480 Marion 407 Grundy 428 Sequatc
Question 1: James and John want to see who catches the most fish on their fishing trips. It is hypothesized that the two brothers catch the same number of fish. James catches an average of 20 fish in 12 fishing trips with a standard deviation of 3 fish and John catches an average of 24 fish in 15 fishing trips with a standard de
3, 5, 5, 4, 6, 7, 7, 5, 9, 10, 12, 9, 6, 5, 7, 8, 7, 4, 11, 6, 8, 8, 10, 6, 7, 4, 4, 5, 7, 9 1. Calculate the mean of the totals. 2. Compare this mean to ?=4.14. Are they the same or different? 3. Use the hypothesis test for the difference of the two means at the 95% confidence level. 4. State the null hypothesis.
1. A maker of golf balls has developed a new ball technology and is interested in estimating the mean difference in driving distance for this new ball versus its existing best-seller. To conduct the test the developers selected six professional golfers and had each golfer hit each ball one time. The distances travelled were:
Sunny- I have increased the bid to 15 credits. Please ensure that you complete all work in minitab and you send me the file. If possible, please email me your word document and minitab file to [email address removed by system]. Thank you. Brad Sunny- Here is the case study and minitab data set reposted and assigne
Write a claim: A taxicab company claims that the mean travel time between two destinations is about 21 minutes. You work for the bus company and want to reject this claim. How would you write the null and alternative hypotheses?
Example 1: Suppose data on retail prices of a cholesterol reducing drug were collected from randomly selected Pharmacies of two states (16 pharmacies from State1 and 13 from State 2) with the following values: State 1 State2 125.05 145.32 137.56 131.19 142.5 151.65 145.95 141.55 117.49 125.99 142.75 126.29 121.99 139.19
Consider the following hypothesis test: HO: µ ≥ 80 Ha: µ < 80 A sample of 100 is used and the population standard deviation is 12. Compute the p-value and state your conclusion for each of the following sample results. Use a = .01. a) x = 78.5 b) x = 77 c) x = 75.5 d) x = 81
1. A chef in a restaurant that specializes in pasta dishes was experiencing difficulty in getting brands of pasta to be al dente-that is, cooked enough so as not to feel starchy or hard but still feel firm when bitten into. She decided to conduct an experiment in which two brands of pasta, one American and one Italian, were cook
1. If you use a 0.05 level of significance in a (two-tail) hypothesis test, what will you decide if Z stat = -0.76? 2. In the U.S. legal system, a defendant is presumed innocent until proven guilty. Consider a null hypothesis, H0, that the defendant is innocent, and an alternative hypothesis, H1, that the defendant is guilty. A
1.An independent test agency is interested in determining whether the mean number of color pages printed using name-brand cartridges exceeds the mean number of color pages printed by generic cartridges. A random sample of 6 users were given both a name-brand cartridge and a generic cartridge and they used their printers until
Hypothesis Testing: What is the general process that one should follow in conducting a hypothesis test?
Explain the notion of hypothesis testing. What is the general process that one should follow in conducting a hypothesis test?
1) Test equally likeliness of random numbers. a. Use Excel to generate 500 random digits per the instructions below. 1. Click on fx and from the Math&Trig category, choose RANDBETWEEN and click OK. 2. In the bottom of the dialog b
1. During a natural gas shortage, a gas company randomly sampled residential gas meters in order to monitor daily gas consumption. On a particular day, a sample of 100 meters showed a sample mean of 250 cubic feet and a sample standard deviation of 50 cubic feet. The manager for the gas company believes that the company may not
1. If we have a sample size of 100 and the estimate of the population proportion is 0.10, the mean of the sampling distribution of the sample proportion is: A. 0.0009 B. 0.10 C. 0.03 D. 0.90 E. 0.09 2. When carrying out a large sample test of H0: m =10 vs. Ha: m # 10 by using a p-value, we reject H0 at level of signif
**A sample size of 900 is not large enough to conclude that the sampling distribution of p is a normal distribution, when the estimate of the population proportion is .995. True or false **If the population is normally distributed then the sample mean is also normally distributed even for small sample size. True or false **F
A study wants to examine the relationship between student anxiety for an exam and the number of hours studied. The data is as follows: Student Anxiety Scores Study Hours 5 1 10 6 5 2 11 8 12 5 4 1 3 4 2 6 6
A sample size of 16 was randomly drawn from a normal population. The mean of these 16 cases was 47.6875 and the sample standard deviation was 19.0883. At an alpha level of .05, does the mean of the population differ significantly from 60?
A leasing firm claims that the mean number of miles driven annually, u, in its leased cars is less than 13,340 miles. A random sample of 13,239 cars leased from this firm had a mean of annual miles driven. It is known that the population standard deviation of the number of miles driven in cars from this firm is 1680 miles. Assu