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Hypothesis Testing

Levels of Significance and Hypothesis Testing

9.54 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 standard

1) At the .01 significance level, is there a difference in the mean number of times men and women order take-out dinners in a month? What is the p-value? 2) At the .05 significance level, is there a difference in the mean waiting time?

27. A recent study focused on the number of times men and women who live alone buy take-out dinner in a month. The information is summarized below Statistic Men Women Sample mean 24.51 22.69 Population standard deviation 4.48 3.86 Sample size 35 40 At the .01 significance level, is there a difference in the mean number

P-Value of Weight Loss

31. A new weight-watching company, Weight Reducers International, advertises that those who join will lose, on the average, 10 pounds the first two weeks with a standard deviation of 2.8 pounds. A random sample of 50 people who joined the new weight reduction program revealed the mean loss to be 9 pounds. At the .05 level of

10 statistics multiple choice questions

1. A large department store examined a sample of the 18 credit card sales and recorded the amounts charged for each of three types of credit cards: MasterCard, Visa and Discover. Six MasterCard sales, seven Visa and five Discover sales were recorded. What are the degrees of freedom for the F statistic? A. 18 in the numerato

Appropriate Hypothesis for Arizona Sports Bar

A professional auto racing driver was given training in competition driving techniques. His driving times in seconds on five different race tracks were recorded before and after the training. At the 0.01 level of significance, was the training beneficial? State and conduct an appropriate hypothesis test. Track Befor

Statistics Professional Auto Racing Drivers

A professional auto racing driver was given training in competition driving techniques. His driving times in seconds on five different race tracks were recorded before and after the training. At the 0.01 level of significance, was the training beneficial? State and conduct an appropriate hypothesis test. Track Befor

Description of Hypothesis Testing

The average price of regular gasoline in the continental US 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 US. The price of gasoline in the eleven western states of the US (Daily Fuel Gauge Report) on the same day

Candidate of a Party being a Projected Winner

Problem In a certain county, two candidates are running for a county office. A couple of hours into the voting, a thousand of the votes cast have been counted and the candidate belonging to party X is leading with 51% of the 1000 votes counted so far. The local TV station wants to determine if a winner can be projected. A cand

Statistics Problems and Hypothesis Testing

This is a question concerning the use of hypothesis testing: A political action committee decided to poll its membership to determine if they were in favor of a certain potential law, similar to gun control. The results that came back were 125 in favor of the law, and 120 against. Given that the crew at the center would use t

Testing Hypothesis Problems and System Increase Error

Suppose a new production system will be implemented if a hypothesis test support the conclusion that the new system increase production. a) state the appropriate null and alternative hypotheses if the mean production of the current system is 400 units per hour. b) what is Type I error in this situation? what are the conseq

Finding a P-Value: Flu Example

In a sample of 476 adults selected randomly from one town, it is found that 9 of them have been exposed to a particular strain of the flu. Find the P-value for a test of the claim that the proportion of all adults in the town that have been exposed to this strain of the flu is 8%. Choose from the following: a) .0262 b) .

Chapter 9 - Hypothesis Testing

I am currently struggling understanding how to get the right answers for my hypothesis testing chapter 9. Please provide steps on how to obtain the solution? I believe I'm missing several steps: Doan & Seward edition 9.7 Calculate the test statistic and p-value for each sample. b. H0: &#960; &#8805; .50 versus H1: &#960; <

Statistical analysis on family dental expenses

Please show the solutions step by step and word-process formulas using Equation Editor. 1. Annual family dental expenses for the families of a random sample of ten employees of a company are given below. You can assume the family dental expenses for the employees of the company are normally distributed. $450, $390, $550, $1

Find the P value for the indicated hypothesis test

In a sample of 47 adults selected randomly from one town, it is found that 9 of them have been exposed to a particular strain of the flu. Find the P value for a test of the claim that the proportion of all adults in the town that have been exposed to this strain of the flu is 8%.

Appropriate Hypothesis Test and Test Statistic

The Dick Tracy Co. has developed micro-miniaturized circuitry that will enable them to produce a wristwatch-sized video-telecommunicator. Research and development costs are believed to be high, and the company is uncertain whether it should proceed. The company has a strategic alliance with Cells-R-Us, a national provider of cel

Hypothesis testing political polls

Political polls typically sample randomly from the U.S population to investigate the percentage of voters who favor some candidate or issue. The number of people polled is usually on the order of 1000. Suppose that one such poll asks voters how they feel about the President's handling of the crisis in the financial markets. The

Statistics Problems

Please help by providing solutions and SHOW WORK to help understand the set up for the problems. Distribution tables are attached for ease. -------------------------------------------------------------------------------------------- 1. In Week 1 of RES/342 we determined the optimal sample size, n, using a three variable formu

Calculating frequencies and testing a hypothesis

2 problems that I need help with. ----------------------------------- # 4) A legal researcher is studying the age distribution of juries by comparing them with the overall age distribution of available jurors. The researcher claims that the jury distribution is different from the overall distribution; that is, there is a no

Null and Alternative Hypothesis for a Set of Problems

An entomologist writes an article in a scientific journal which claims that fewer than 11 in then thousand male fireflies are unable to produce light due to a genetic mutation. Use the parameter p, the true proportion of fireflies unable to produce light. Choices: Ho p =0.0011 H1 p > 0.011 H0 p>0.0011 H1 P< or = 0.011

Math Term Expression

Could you please help me express the written in math terms, and also provide charts or graphs to represent? During the past three (May, June and July) a vast amount of employees been absent from Greg's Grand Corporation. The amount of absences in one department has caused great concern in Greg's Grand Corporation's management

Samples - Perform hypothesis testing ...

Perform hypothesis testing on one variable's data(choose either the intrinsic or extrinsic Job Satisfaction)using 25 as our data set number. Perform a t-test by formulating a null and an alternative statement choosing an acceptable significance value, determining the appropriate critical value, selecting the test statistic and

Hypothesis testing on real estate data

STATISTICS Tasks: ? Decide on an issue that you wish to investigate and obtain the sample data that you will use. ? Decide on 5 questions (in everyday English) that you wish to answer. Note: At this stage, do not try to answer these questions. ? For each quantitative variable use Excel to analyze your data by o p

Show why you support Chrysler's claim by listing the p-value from your output. Test the claim about standard deviation. What action should Chrysler take to remedy complaints?

Chrysler Corporation agrees to allow you to randomly select 40 of its new Dodge Caravans to test the highway mileage. Chrysler claims that the caravans get 28mpg on the highway. Your results show a mean of 26.7 and a standard deviation of 4.2. You support Chrysler's claim. 1. Show why you support Chrysler's claim by listing t

Complete the following analysis on various hypotheses.

The team determined that to confirm the validity of their screening experiment they should compare the test score results for some students that were at both the high setting and low setting within the last three years. This would allow them to compare the impact of the factors for individual students. What I need to fi

Hypothesis Testing

The Non-Profit Times conducted a random sample of 126 U.S. non-profit companies at the beginning of 2005. The results reported that the average salary of an executive director of a nonprofit was $92,411 per year with a sample standard deviation of $25,326. A research team from a competing newspaper, which was skeptical of thes

Mutual funds Investors Examined

1. Periodically, Merrill Lynch customers are asked to evaluate Merrill Lynch financial consultants and services (2000 Merrill Lynch Client Satisfaction Survey). Higher ratings on the client satisfaction survey indicate better services, with 7 the maximum service rating. Independent samples of service ratings for two financial co