1. a) What is a hypothesis? Specifically, is it a statement about the population or the sample? b) What is the purpose of hypothesis testing? c) How is the role of the null hypothesis different from that of the research (alternative) hypothesis? d) Provide an example of a hypothesis test you could conduct at work
When an election for political office takes place, the television networks cancel regular programming and instead provide election coverage. When the ballots are counted, the results are reported. However, for important offices such as president or senator in large states, the networks actively compete to see which will be the f
Ravencheck Resources, Inc. is a brokerage of ten salespeople. A productivity survey of the firm's employees indicated the following data: Sales Representative Number of units Sold Number of Sales
1. For the following scores, X Y 3 6 6 1 3 4 3 3 5 1 a) Find the regression equation for predicting Y from X b) Calculate the predicted Y value for each X 2. For the following scores X Y 1 6 4 1 1 4 1 3 3
I have to develop a research design for a pretend study. It will be quantitative to study the effects of linguistic modification on nursing exams for one year. The original exam and the modified exam will be randomly assigned to students (native English speakers and English as a second language students). There would be scores f
Construct a 95% confidence interval for the proportion of red candies. Using your same data determine if the proportion of green candies in a package of M&Ms is different than what is claimed by the company. List null and alternative hypothesis, the test-statistic and the p-value. If you wanted to estimate the proportion of
Although there is a popular belief that herbal remedies such as ginkgo biloba and ginseng may improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research. In a typical study, a researcher obtains a sample of n=36 participants and has each person take the herbal supplements e
A local college requires an English composition course for all freshman. This year they are evaluating a new online version of the course. A random sample of n=16 freshman is selected and the students are placed in the online course. At the end of the semester, all freshman take the same English composition exam. The average sco
Please show all steps: A hospital group operates 33 clinics in Indiana and Illinois. A study was conducted to estimate the difference in mean time spent per visit for men and women. Previous studies indicated that the standard deviation is 11 min, for men and 16 min. for women. A random sample of 100 men and 100 women at the
You are interested in understanding whether the average Lifetime Value (the net present value of all the transaction expected from a customer) for the customers in the Floridais significantly different from those in California. You suspect that the CaliforniaLTV (Lifetime value) would be higher than in Florida. In order to tes
A telemarketing company wants to find out if people are more likely to answer the phone between 8pm and 9pm than between 7pm and 8pm. Out of 96 calls between 7pm and 8pm, 72 were answered. Out of 105 calls between 8pm and 9pm, 90 were answered. Using a one-sided hypothesis test with a 90% confidence level, which of the follow
Explain the difference of your outlook on statistics after having studied it for whatever period of time you have done so as oppose to the time before taking up the study. (At least 1 Paragraph) Give at least three examples and explain: How can statistics be used in everyday life. (At least 2 Paragraph) In your opinion, w
Using the Internet, students will access information and statistics about professional basketball teams. They will use these data to explore relationships between player characteristics and their performance on the basketball court. I provided an example of the NBA project in the attched documents.
(a) Write the Claim mathematically and identify Ho and Ha (b) Find the critical value(s) and identify the rejection region(s) (c) Find the Standardized test statistics. (d) Decide whether to reject or fail to reject the null hypothesis In a sample of 1788 of home buyers, you find that 637 home buyers found their real estate
Financial analysts often use the following model to characterize changes in stock prices: Pt = Po*e^(u-0.5s^2)t+s*Z*t^0.5 where Po = current stock price Pt - price at time t u - mean (logarithmic) change of the stock price per unit time s = (logarithmic) standard deviation of price change Z = standard normal random var
I need some help with the following questions: How is the rejection region defined and how is that related to the z-score and the p value? When do you reject or fail to reject the null hypothesis? Why do you think statisticians are asked to complete hypothesis testing?
A personal director in a particular state claims that the mean annual income is greater in one of the state's counties (county A) than it is in another county (county B). In county A, a random sample 17 residents has a mean annual income of $42,000 and a standard deviation of $8500. In County B, a random sample of 8 residents
1. Refer to the sample data given below: The mean tar content of a simple random sample of 25 unfiltered king-size cigarettes is 21.1 mg, with a standard deviation of 3.2 mg. The mean tar content of a simple random sample of 25 filtered 100 mm cigarettes is 13.2 mg with a standard deviation of 3.7 mg. Assume that the two sampl
A student of the author surveyed her friends and found that among 20 males, 4 smoke and among 30 female friends, 6 smoke. Give two reasons why these results should not be used for a hypothesis test of the claim that the proportions of male smokers and female smokers are equal. Given a simple random sample of men and a simple ra
1. Examine the given statement: The proportion of people aged 18-25 who currently use illicit drugs is equal to 0.20 (or 20%). Now, express the null hypothesis H0 and alternative hypothesis H1 in symbolic form. Be sure to use the correct symbols µ, p, and for the indicated parameter. 2. Refer to the following data: Two-tai
Explain the relationship between statistical significance and effect size.
A taxi company manager is trying to decide whether the use of radial tires instead of regular belted tires improves fuel economy
1. A taxi company manager is trying to decide whether the use of radial tires instead of regular belted tires improves fuel economy. Twelve cars were equipped with radial tires and driven over a prescribed test course. Without changing drivers, the same cars were then equipped with regular belted tires and driven once again over
Please help with the following problem. I need to test the hypothesis (? = 0.05) that the population proportions of red and brown are equal (pred = pbrown). You are testing if their proportions are equal to one another, NOT if they are equal to one another AND equal to 13%. NOTE: These are NOT independent samples, but we w
A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.
For this activity you will undertake an analysis based on a self-designed fictitious study that utilizes statistical methodologies. You will first develop a fictitious problem to examine, it can be anything. For example, maybe you want to look at whether scores on a standardized college placement test (like the SAT) are related
A researcher predicts that listening to music while solving math problems will make a particular brain area more active. To test this, a research participant has her brain scanned while listening to music and solving math problems, and the brain area of interest has a percentage signal change of 58. From many previous studies
See the attached file. "It is a well-established fact of American political life that young voters are not dependable voters. In a close election, however, the support of even low-turnout groups can be decisive. Thus, Obama's campaign team apparently decided that his visits to college campuses this week could pay off if he is
I need some help with the following assignment: In an attempt to determine whether or not special training increases the speed with which assembly line workers can do an assembly job at AMTEL Inc., 25 workers are timed performing the task. Then, they are given a special training course designed to increases their assembly eff
Refer to data attachment 1. Century National Bank Refer to data. When Mr. Selig took over as president of Century several years ago, the use of debit cards was just beginning. He would like an update on the use of these cards. Develop a 95 percent confidence interval for the proportion of customers using these cards. On the
Say you think your positive pairs trade returns are due to pairs trades you made on small stocks (measured by market capitalization). Describe how would you test this hypothesis? What regression equations would you use, and what would your null and alternative hypotheses be on the coefficients? If your positive pair trade re