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Hypothesis Testing

Wilcoxon Rank Sum Test: Primary Care

Use the Wilcoxon rank rum test. Assume that the samples are independent. Also perform each of these steps. state the hypothesis and identify the claim find the critical value compute the test value make the decision summarize the results. Samples of enrollments from medical schools that specialize in research and in pr

Hypothesis Testing & Confidence Interval: M&M Candies

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

Emotional Responses to Classical Music

Steven collected data from 20 college students on their emotional responses to classical music. Students listened to two 30-second segments from "The Collection from the Best of Classical Music." After listening to a segment, the students rated it on a scale from 1 to 10, with 1 indicating that it "made them very sad" to 10 in

Hypothesis using a Paired-Sample Sign Test

It was thought that hypnosis would lower a person's desire to smoke. A researcher decided to investigate this hypothesis using a paired-sample sign test in which the number of cigarettes/day smoked by subjects was recorded before and after hypnosis. Given that the critical value for ten samples at a = 0.05 in a one-tailed test i

Hypotheses - "Overweight Individuals at McDonalds"

Billie wishes to test the hypothesis that overweight individuals tend to eat faster than normal-weight individuals. To test this hypothesis, she has two assistants sit in a McDonald's restaurant and identify individuals who order the Big Mac special for lunch. The Big Mackers as they become known are then classified by the ass

Hypotheses - "The Collection from the Best of Classical Music"

Steven collected data from 20 college students on their emotional responses to classical music. Students listened to two 30-second segments from "The Collection from the Best of Classical Music." After listening to a segment, the students rated it on a scale from 1 to 10, with 1 indicating that it "made them very sad" to 10 in

Null and alternative hypothesis problems.

Problem 1) 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. Problem 2) At one school, the average amount of time that tenth-graders spend watching telev

Conducting statistics for herbal remedies

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

Statistics on English composition course

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

A hospital group operates 33 clinics in Indiana and Illinois

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

Hypothesis Testing-ADHD

Create a research question centered around adhd and treatment effectiveness, the independent and dependent variables you would study, an explanation of whether a one- or two-tail test is most appropriate, your testable null and alternative hypothesis, and an explanation of which alpha level you would select and a justification o

Determining a significant difference at the 0.05 level

1. A researcher wants to see if there is a relationship between birth order and personality. A sample of n = 100 people is obtained, all of whom grew up in 3-child families. On the basis of the frequencies shown below, can the researcher conclude that there is a significant difference at the .05 level? 2. In an ESP experime

Qualitative Analysis: Average Price of Gasoline

The average price of regular gasoline in the continental U.S. states and the District of Columbia was $3.74 on August 18, 2008. Alaska and Hawaii are not included as the gas prices there are much higher than the continental U.S. The price of gasoline in the eleven western states of the U.S. on the same day is given below. Test t

Hypothesis Testing: SPSS Tables

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

Sample Mean for a Normal Population

A random sample is selected from a normal population. The population mean is ?=60 and the population standard deviation is ?=15. After a treatment is given to the members of the sample, the sample mean is M=65. The sample size is n=25. The hypothesis test: H0: ?=60 H1: ?= <>60 ?=0.05 Give reason why or why not the sample

Corporate Finance

Q-1a. You run a small Internet business and are concerned about customer support service levels on the Help Desk. You want to know how many calls per day are handled by your help desk staff. You collect the data at left over a 90-day period. Use appropriate descriptive statistics to make sense of this data. Use an appropri

Null Hypothesis

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

Business Statistics

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

Statistics

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.

Information Regarding Organ Transplantation for Different Years

Listed below is information regarding organ transplantation for three different years. Based on these data, is there sufficient evidence at a= 0.01 to conclude that a relationship exists between year and type of tranplant? Year Heart Kidney/Pancreas Lung 2003 2056 870 1085 2004

Null hypothesis, alternative hypothesis

(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

Model for random stock price using excel.

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

Rejection Region

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?

perform the null hypothesis

A car dealership is worried that Hondas are getting lower sales than Hyundai. Two independent random samples have been selected 630 observations from population 1 (Hondas) and 610 from population 2 (Hyundai). The sample means obtained are X1(bar)=$46 k and X2(bar)=$47 k. It is known from previous studies that the population vari

Testing Hypothesis Claim

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

Inferences from Two Samples

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