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# Hypothesis Testing

### 5 Step Hypothesis Test for Bellevue Steel

The production manager at Bellevue Steel, a manufacturer of wheelchairs, wants to perform a second analysis of the number of defective wheelchairs produced on the day shift and afternoon shift. A sample of the production from 6 day shifts and 8 afternoon shifts revealed the following number of defects. At the 0.05 significanc

### Many Hypothesis Testing Problems

14. 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 waking-even if they are not exposed to the usual pattern of sunlight. To test this notion, eight paid volunteers were placed (indiv

### Hypothesis Testing of Mean: BMI

Identify the null and alternative hypothesis, test statistic, P-value,critical values and state the final conclusion that addreses the original claim: The trend of thinner Miss America winners has generated charges that the contest encourages unhealthy diet habits among young women. Listed below are body mass indexes (BM) fo

### Hypothesis test for mean spending habits of \$375

Families of size 4 spent a population mean of \$360 on a visit to an amusement park, standard deviation of \$50 in October 2000. Operators want to know whether families will spend more in 2001. In an April exit poll, 64 randomly selected families of size 4 were interviewed with the average amount spent by families in the sample

### Statistics Problems

2. For each of the following, indicate whether the factor influences the numerator or denominator of the z score and determine whether the effect would be to increase the value of z (further from zero) or decrease the value of z (closer to zero). In each case, assume that all other components of the z score remain constant. a

### Hypothesis Testing of Mean & Proportions

For the following four problems: 1. State the Null Hypothesis and the Alternative Hypothesis 2. Determine the test statistic. 3. Determine the P-value 4. Make a decision regarding the hypotheses based on the P-value and the Level of Significance. 1. In a recent year, some professional baseball players complained that u

### 5 Step Hypothesis Test

The following data represents the running time of films produced by 2 motion picture companies. Assume these are independent samples Company Time (in minutes) Company 1 102 86 98 109 92 Company 2 81 165 97 134 92 87 114 Test the null hypothesis that the average running time of th

### Upper and lower confidence intervals: Water treatment example

Most water treatment facilities monitor the quality of their drinking water on an hourly basis. One variable monitored is pH, which measures the degree of alkalinity or acidity in the water. A target pH level is 8.5. pH values below 8.5 is acidic and above 8.5 is alkaline, both of which are bad for health. A random sample of

### Business Statistics with 95% confidence intervals

1. Determine the minimum required sample size if you want to be 95% confident that the sample mean is within 3 units of the population mean given sigma = 7.8. Assume the population is normally distributed. 2. A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1050 hours. A homeowner selects 40 bulbs and

### Statistics: How do they enrich the results of a study? How can they misrepresent the results of a study?

Based on what we know about statistics and using your example, how do you believe statistics can enrich and represent the results of a study? How can statistics be used to misrepresent the results of a study? With these thoughts in mind: Write an example, a description of how you believe statistics can enrich and represen

### Short Feedback

1. describe the "third variable problem" as it relates to correlation and provide an example of how you might see this played out in your own field. 2. How does hypothesis testing contribute to the scientific knowledge base? Now that you have a general understanding of hypothesis testing, provide an example of how you might

### Hypothesis Testing in the article, Sekaran Research Process

See attached file. I have copied and pasted article because its too big for me to attach it. http://74.6.238.254/search/srpcache?ei=UTF-8&p=Motivating+Salespeople+to+Sell+New&fr=yfp-t-701&u=http://cc.bingj.com/cache.aspx?q=Motivating+Salespeople+to+Sell+New&d=4672628204834757&mkt=en-US&setlang=en-US&w=45df3d5a,639e8558&icp

### Two statistics questions: National average for BMI

The National average for BMI in US is 26.5 for females and 26.6 for males. Answer the following (assume we DO NOT know the standard deviation for the U.S. population for BMI) ... Is there a statistically significant difference in the BMI for females who are in "Excellent" or "very good" health from those who rate their health

### How to operationally define IV and DV

I need to figure how to operationally define my independent variable (IV), dependent variable (DV), null hypothesis, and alternative hypothesis. Here is the information: A medical researcher tests the effectiveness of new cancer medication on a sample of 1000 cancer patients. Half of the subjects are randomly assigned to

### Clinical Project: Analyze the test data for the assays given

See data file attached. CD4 % LYMPHOCYTES WBC (X1000/ul) HB (g/dl) PLATELETS (x1000/ul) MCV (f/l) A B C D E 1. Analyze the test data (for the assays given above A, B, C, C, D, E) at the 1, 5, 9 month time points. 2. Determine if the results for each assay at the respective

### Hypothesis for amount of real estate taxes in sample; type 2 error, difference in the means

See attached file. Consider the file data on Taxes that is included in worksheet P2 on the exam template. This data represents property taxes paid by 170 residents that live in a small town. Assume this file to be the entire population. Answer the following questions: a. A local politician in this town ha

### 10 Statistics problems: Random samples, sample size, 5 step hypothesis, rejection region

Also see attached file. Interval Lower Limit Points 1 A random sample of 35 days taken at a large hospital shows that an average of 44 patients was treated in the emergency room per day. The standard deviation of the population is 6. Find the 99% confidence interval of the mean number of ER patients treated

### Statistical Testing, Significance Levels for Clinical test data

Please read the attachment carefully before attempting the problem. Minitab is the preferred program for analysis. Excel is not acceptable. CD4 % LYMPHOCYTES WBC (X1000/ul) HB (g/dl) PLATELETS (x1000/ul) MCV (f/l) A B C D E 1. Analyze the test data (for the assays given above

### Hypothesis Testing for Ford Motor Taurus; Random sample of 300 beer drinkers

Ford Motor Company wishes to estimate the mean dollar amount of damage done to a new model Taurus as a result of a 10 mph crash into the rear bumper of a parked car. 36 Tauruses are test crashed into parked cars and the dollar amount of damage done to each is recorded. The results are: a. Does the sample data provide evid

### Do the Princess or Carnival Cruise Passengers Tip Better?

A tour guide in the Bahamas wonders whether Princess or Carnival cruise passengers tip better. Pr: x-bar=\$15 s=3 n=15 cc: x-bar=\$18 s=5 n=19 What is Ho and Ha? What is the test statistic? Find P and write conclusion.

### Feedback about the "third variable problem"

1. Describe the "third variable problem" as it relates to correlation and provide an example of how you might see this played out in your own field. 2. How does hypothesis testing contribute to the scientific knowledge base? Now that you have a general understanding of hypothesis testing, provide an example of how you might

### Hypothesis Test: Difference Between Population Portions in automobile engine assembly

Two teams of workers assemble automobile engines at a manufacturing plant. Quality control personnel inspect a random sample of the teams assemblies and judge each assembly to be acceptable or unacceptable. A random sample of 127 assemblies from team 1 shows 12 unacceptable assemblies. A similar random sample of 98 assemblies

### Statistics: Analyze AIU's data set for job survey information

See attached data set file. Using AIU's survey responses from the AIU data set, complete the following requirements in the form of a report: Perform a two-tailed hypothesis test on both the intrinsic and the extrinsic variable's data, using a .05 significance level. Begin by creating a null and an alternate statement.

### Statisitcs: Managerial Economics

6. From the following table giving the quantity demanded of a commodity (Y), its price (X1), and the consumers income (X2) from 1986 to 2005, a) estimate the regression equation of Y on X1 and X2, b) test at the 5 % level for the statistical significance of the slope parameters, c) find the unadjusted and the adjusted coefficien

### Statistics: test the hypothesis

See attached data files. 1. Data File ERWAITING contains the waiting times in minutes for 15 randomly selected patients at a hospital main emergency room facility and at three satellite facilities. a. At the .05 level of significance, is there evidence that the mean waiting time at the main facility is more than one hour?

### Stats Excel

1 "Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standar

### Hypothesis Test - Paired Samples

In a two-population test, when will you use paired samples? Provide an example and state the Null and the Alternative hypothesis for the examples in symbolic form.

### Time required to prepare a federal income tax return

AARP reported on a study conducted to learn how long it takes individuals to prepare their federal income tax return. The data contained in the file named TaxReturn are consistent with the study results. These data provide the time in hours required of 40 individuals to complete their federal income tax return. Using past yea

### Data Analysis of US Bureau of Labor Statistics

See attached files. I. I chose a published database containing government data; U.S. Bureau of Labor Statistics. The chosen file must have several variables in order to conduct the required analysis stated below. Bureau of Labor Statistics (See attachment) Table 1. Mass layoff events and initial claimants for unemploymen

### Sekaran Process: Generate data, test hypothesis

Using the information from attached files prepare to test the hypothesis (Step 8 of the Sekaran process) using simulated data: Search and identify the surveys, assessment tools or instruments you would consider to gather data on the variables that are contained within the same hypothesis you have been using for your IP1 and I