Explore BrainMass

# Hypothesis Testing

### 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

### Inferences from Two Proportions

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

### Solving Hypothesis Testing Problems

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

### Statistical Significance and Effect Size

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

### Level of Significance

A small shirt producer, is concerned that the mean weight of their classic shirt is not greater than 3.0 pounds. It can be assumed that the population standard deviation is .9 pounds based on past experience. A sample of 310 hats is selected and the sample mean is 3.15 pounds. Using a level of significance of .05, is there ev

### Test Hypothesis for Population Proportions

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

### Steven collected data from 20 college students on their 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 ind

### Performing One Tailed or Two Tailed Hypothesis Test

a. In a similar study using a sample of n = 9 participants, the individuals who wore the shirt produced an average estimate of M= 6.4 with SS = 162. The average number who said they noticed was 3.1. Is the estimate from the participants significantly different from the actual number? Test the null hypothesis that the true mean i

### Test of Significance

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.

### Fictitious Statistical Study

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

### Hypothesis Testing and Spending Money on Video

Clayton believes that the individuals in their target group (those with higher incomes) would be willing to spend at least fifteen dollars on a video, and he wants you to test that hypothesis.

### Five Steps of Hypothesis Testing: Statistics

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

### Cross Tabulation Containing Absolute and Relative Frequencies

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

### Two-tailed hypothesis test, using a .05 significance level

Using AIU's survey responses from the AIU data set, complete the following requirements in the form of a 2-page report: TEST #1 Perform the following two-tailed hypothesis test, using a .05 significance level: -Intrinsic by Gender -State the null and an alternate statement for the test Use Microsoft Excel (Data Anal

### Level of Significance

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

### What is the relationship between confidence intervals and hypothesis testing? How are they the same? How are they different?

What is the relationship between confidence intervals and hypothesis testing? How are they the same? How are they different?

### CNP Bank Stat

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

### Distribution at the 5% level of significance

For this data below: At the 5% level of significance, does the distribution of colors in M&Ms bag agree with the official theoretical (production) distribution? Does the distribution of colors agrees with the official theoretical color distribution. Data: Color Milk Chocolate M&M's Cyan blue 3 Orange 4 Green 2 Brigh

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

### Sketching a Distribution - Question

Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and wakingâ?"even if they are not exposed to the usual pattern of sunlight. To test this notion, eight paid volunteers were placed (indivi

### Case Study Regression Equations

See the attached file. The case study is a written report, and it should include an introduction, your responses to the questions being asked, and a conclusion. Remember, the case study is more than just a collection of Excel output, and it should be written in complete, grammatically correct sentences. You should submit two

### House Pricing and Resale Value Problems

The national median sales price for new single-family homes is \$230,000 (The Associated Press, March 25, 2006). Assume that the following data were obtained for sales of existing single-family homes in Houston and Boston. Greater than \$230,000 Equal to \$230,000 Less than \$230,000 Houston 11

### Cholesterol Statistics

You work as a consultant for a firm that specializes in workplace health. You have recently been put on a team that has been hired by a company with 80 employees, half men and half women that are considering instituting an employee wellness program as they have specific concerns over obesity and cholesterol levels among their e

### Hypothesis Test for the Correlation Coefficient R

For the accompanying data set (a) draw a scatter diagram (b) compute the correlation coefficient rounded to three decimal places and (c) determine rather there is a linear relation between x and y Data Set x 2 6 6 7 9 y 8 7 6 9 5