Explore BrainMass

Hypothesis Testing

Hypothesis Testing and Normal Probability

Please show all work. A researcher is studying the wait time of patients entering the emergency room for a particular hospital in Miami. The researcher obtains the weight time (in minutes) for a sample of 15 individuals. The wait times for the 15 individuals are given in the table below: 125 91 128 81 134 135 123 86 82 12

Conclusions about tests of subjects in immunology study

In a sample of 49 adolescents who served as the subjects in an immunologic study, one variable of interest was the diameter of skin test reaction to an antigen. The sample mean and sample standard deviation were 21 and 11mm erythema, respectively. Can it be concluded from these data that the population mean is less than 30? Let

Statistics: Asperger's syndrome; Olympic marksmen

A researcher is studying nonverbal intelligence in elementary school students identified as having Asperger's syndrome (an autism spectrum disorder often characterized by higher verbal communication skills than individual's with autism). Specifically, the researcher wants to study whether students identified as having Asperger'

Hypothesis Test: Average Teacher Salaries

A researcher reports that the average salary of teachers is more than $50,000, A sample of 25 teachers has a mean annual salary of $51,000. At alpha=.05, test the hypothesis that teachers earn more than $50,000 a yr. The standard deviation of the sample of 25 teachers is $2,000. (be sure to show your graphic, hypothesis setup, i

Examining Null and Alternate Hypothesis

1. Set-up the hypothesis test for each study described below. (Just setup the null and the alternative hypothesis, and make sure the hypothesis is testable) a. The cure for patients using an old drug against disease X was 50%. A new drug purports to improve the cure rate for Disease X. Set up the hypothesis test b. A rese

Research Proposal

This is a brief research proposal designed to test a discipline-specific theory of your choice using measures with established validity evidence. The project will be completed in three assignments. Project 2, Part 1 focuses on the background and introduction of your proposal. Select a discipline-specific theory from the list

Part One of WLS in SPSS 19

Attached is data from 2004 to 2010. The work for 2010 is complete, but since I did not do all the work myself in SPSS I do not know the steps. Please outline the steps I need to click in SPSS 19 to complete the data for the other years just as it was for the year 2010 (what do I click in SPSS 19 to run this data?) Please check t

Statistics: Stratified sampling for large school district

See attached file. Assume that you are working on a team that has been commissioned by a large school district to collect and analyze data related to a recent curriculum experiment designed to improve student scores on state-wide standardized tests. The schools in this district are predominantly large, urban school

Develop the null hypothesis and the alternative hypothesis.

See attached file. State the statistical assumptions for this test. Using the data set you have selected, choose two continuous variables for which you would like to test a relationship. Develop the null hypothesis and the alternative hypothesis. Use SPSS to calculate a correlation coefficient and a simple linear regre

Hypothesis Testing of Mean: Sodium Content in Sports Drink

The sodium content of a popular sports drink is listed as 220 mg in a 32-oz bottle. Analysis of 10 bottles indicates a sample mean of 228.2 mg with a sample standard deviation of 18.2 mg. Calculate the t test statistic to test the manufacturer's claim to 4 decimals.

Hypothesis Testing Tutorial

Please help me to understand how to perform the given testing method: Perform the following hypothesis test using the 5 step hypothesis testing method: Null Hypothesis, Ho: b = 0 Alternate Hypothesis, Ha: b # 0 Mean = 1.87 Standard Deviation = 0.63 Sample Size = 3 Significance Level, alpha = 0.05

Test and Interpret Lifetime Value in California and Florida

See attached file. You are interested in understanding whether the average Lifetime Value (the net present value of all the transactions expected from a customer) for the customers in the Florida is significantly different from those in California. You suspect that the California LTV (Lifetime value) would be higher than in

Hypothesis Test

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

Hypothesis Testing: Difference Between Two Means

Please help with the following problem. For the paired data: Perform a hypothesis test for the difference of two means. Remember to show all steps and to explain, give an interpretation of the results. This is the hypothesis I am using; The claim that cars with mpg>29 have a lower mean weight than cars with mpg<=2

Steps in Hypothesis testing for critical region and critical values

12. Determine the critical region and critical values for z that would be used to test the null hypothesis at the given level of significance, as described in each of the following: A) Ho: µ &#8804; 22 and Ho: µ > 22, &#945; = 0.10 B) Ho: µ &#8805; 62 and Ho: µ < 62, &#945; = 0.05 C) Ho: µ = 65 and Ho: µ

Discussion Question: Use of hypotheses and hypothesis testing

See attached article. Review the following articles given under your week 1 Articles - Electronic Reserve Readings link, and write a short synopsis (200 -300 words) of the main points and learning takeaways. In your response, refer to your Seward text readings for week 1, to support your analysis. THE PURPOSE OF HYPOTHESES

Statistics test procedures, test statistic, p value, hypothesis testing

See attached files. 9. The state department of education is interested the length of time it takes students to graduate. As part of the study the department manager wants to determine whether the proportion of all female students graduating in 5 years or less ( out of all females who graduate) is significantly different from

Null and alternate hypothesis for mean income per person in the US

The mean income per person in the United States is $41,500, and the distribution of incomes follows a normal distribution. A random sample of 10 residents of Wilmington, Delaware, had a mean of $47,500 with a standard deviation of $10,600. At the .01 level of significance, is that enough evidence to conclude that residents of Wi

Test hypothesis, decision rule, value of test statistic

The mean income per person in the United States is $41,500, and the distribution of incomes follows a normal distribution. A random sample of 10 residents of Wilmington, Delaware, had a mean of $47,500 with a standard deviation of $10,600. At the .01 level of significance, is that enough evidence to conclude that residents of Wi

Normality of Private Four Year College Enrollment

Private Four-Year College Enrollment A random sample of enrollments in Pennsylvania's private four year colleges is listed here. Check for normality. 1350 1886 1743 1290 1767 2067 1118 3980 1773 4605 1445 3883 1486 980 1217 3587

Hypothesis Testing of Population Proportion and Level of Significance

According to the National Institute for Occupational Safety and Health, job stress poses a major threat to the health of workers. A national survey of restaurant employees found that 75% said that job stress had a negative impact on their personal lives. A sample of 100 employees of a restaurant chain finds that 68 answer Yes

Hypothesis Testing of Mean: Chronic Fatigue Syndrome

Patients with Chronic Fatigue Syndrome were tested, and then retested after being treated with fludrocortisone. The changes in fatigue after treatment were measured (based on data from "The Relationship between Neurally Mediated Hypotension and the Chronic Fatigue Syndrome" by Bou-Holaigah, Rowe, Kan, and Calkins, Journal of the

Test four colors of sticky boards in a field of oats to trap beetles

The presence of harmful insects in farm fields is detected by erecting boards covered with a sticky substance and then examining the insects trapped on the board. To investigate which colors are most attractive to cereal leaf beetles, researchers placed six boards of each of four colors in a field of oats. The data is listed bel


The Computer Anxiety Rating Scale (CARS) measures an individual's level of computer anxiety, on a scale from 20 ( no anxiety) to 100 (highest level of anxiety). Researchers at Miami University administered CARS to 172 business students. One of the objectives of the study was to determine whether there is a difference between th

Critical Value, Calculated Value, and P-Value

See the attached file. A national sales manager of an automobile supply chain claims that monthly sales of auto parts at on of the district office are an average of $5,285. The district manager believes the amount is too high. They authorize you to settle the dispute. You take a simple random sample (n=25) of the sales receip

Hypothesis testing : T test.

32. What probability value would be needed to complete the following probability distribution? x -5 -1 0 1 4 P(x) 0.13 0.25 0.12 0.30 25. An apartment building has the following apartments: 1 bedroom 2 bedroom 3 bedroom 1st floor 3 1 1 2nd floor 2 2 2 3rd floor 1 4 1 If an apartment is selected at random, what is