Hypothesis testing
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Hypothesis Testing
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Alternative Hypothesis Testing Claims
Please see the attached file. 4. (a) What is the meaning of the term "null hypothesis". (b) How do you know when to perform a "left-tailed" test in a hypothesis-testing situation versus a "right-tailed" or "two-tailed" test? 5. A hypothesis test is used to tes
Hypothesis Testing
A bond analyst is analyzing the interest rates for equivalent municipal bonds issued by two different states. At= .05, is there a difference in the interest rates paid by the two states? State A State B Sample size 80 70 Mean interest rate (%) 3.7 4.25 Sample variance
Hypothesis Testing
66% of students at a university live on campus. A random sample found that 20 of 40 male students and 40 of 50 of female students lived on campus. At the .05 level of significance, is there sufficient evidence to conclude that a difference exists between the proportion of male students who live on campus and the proportion of
Alternative Hypothesis
A researcher wanted to determine if using an octane booster would increase gasoline mileage. A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster. Miles /Gal Without Miles / Gal With 21.2 23.8 25.4 25.6 2
Test Value
A pharmaceutical company is testing the effectiveness of a new drug for lowering cholesterol. As part of this trial, they wish to determine whether there is a difference between the effectiveness for women and for men. At = .05, what is the test value? Women Men Sample size 40 70 Mean effect 7 6.75 Sample variance
Applied Statistics: Dallas fire trucks, Lovestain drug, student exams, concession stands
10.30 In Dallas some fire trucks were painted yellow instead of red to heighten their visibility. During a test period, a fleet of fire red trucks 153,348 runs and had 20 accidents. While the fleet of yellow trucks made 135,035 runs and had 4 accidents At a (P [Rejecting the null hypothesis |Null hypothesis is true]). =.01 did t
Variation of Hypothesis
My problem is as follows and is presented in attached Excel file.I tried to cut and past in this descripton box, but all symbols did not transfer, so please refer to the attachment. The following hypotheses are given: H0: 12 ≤ 22 H1: 12 > 22 A random sample of 5 observations from
Test of Hypothesis-Difference Between Means
A South American custom candy producer wants to know if the mean daily consumption of regular sugar sweetened candy eaters is less than that of artificial sweetened candy eaters. Assume the standard deviation for those regular sugar sweetened candy eaters is 1.20 candy products per day and 1.36 for those individuals eating the c
Test of Hypothesis using a Sample
Marconi Shipping Company packages their shipments in 50 ton containers. History has shown that the shipping department reports that the distribution of container weights follows the normal distribution, and the standard deviation of this process is 3 tons per container. At the end of each day, the shipping coordinator weighs 10
Hypothesis Test for the Average Salaries of a College Graduates
A college wishes to make the claim that 50% of it's graduates earn more than $70,000 ten years after graduation. The distribution of salaries of these graduates is completely unknown. A sample of 15 ten year alumni were surveyed and they reported their salaries to be (see attached). Is there evidence, at the 5% significance
Probability & Stat
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Solution to four hypothesis testing problems
Problem #5 Reis, Inc. Reis, Inc., a New York real estate research firm, tracks the cost of apartment rentals in the United States. In mid-2002, the nationwide mean apartment rental rate was $895 per month (The Wall Street Journal, July 8, 2002). Assume that, based on the historical quarterly surveys, a population standard de
A lab technician is tested for her consistency by taking multiple measurements of cholesterol
A lab technician is tested for her consistency by taking multiple measurements of cholesterol levels from the same blood sample. The target accuracy is a standard deviation of 1.2 or less. If 20 measurements are taken and their standard deviation is 1.8, is there enough evidence to reject the claim that her standard deviation
Hypothesis Testing for Grade Point Averages
16.26 Below are grade point averages for 25 randomly chosen university business students during a recent semester. Research question: At α = .01, are the median grade point averages the same for students in these four class levels? GPA Grade Point Averages of 25 Business Students Freshman Sophomore Junior Senior (5 stude
Hypothesis testing for mean number of miles traveled for employees
As part of a study of corporate employees, the Director of Human Resources for PNC, Inc. wants to compare the distance traveled to work by employees at their office in downtown Cincinnati with the distance for those in downtown Pittsburgh. A sample of 35 Cincinnati employees showed they travel a mean of 370 miles per month, with
Study Habits - Hypothesis Testing
STUDENT 1 STUDENT 2 STUDENT 3 21 22 10 10 26 23 24 10 23 31 30 26 19 11 10 Need help running the 5 step hypothesis process
Hypothesis Testing
Please provide Detail (No excel). A metropolitan bus system sampler's rider counts on one of its express commuter routes for a week. Use the following data to establish whether rider ship is evenly balanced by day of the week. Let alpha = 0.05. Day Monday Tuesday Wednesday Thursday Friday Rider Count 10 34 21 57
Hypothesis Testing Mean Consumptions
Please see the attached file. The mean consumption of beef in 2000 by American adults was 63.5 pounds. A sample of 36 people recently taken yielded the following data, in pounds, on year 2007 beef consumption. Test the claim that the amount of beef consumption has changed since 2000.
Hypothesis Testing
The 65 students in a class at the University of Soda were given blinded evaluations of pairs of cola drinks. For the 65 comparisons of Coke and Pepsi making up the sample results, Pepsi was preferred 29 times. a. Is the above information sufficient for you to be completely certain that more than 50% of all students at that u
Hypothesis Testing
Please see the attached file. A hypothesis test is used to test a claim. You get 1.75 as your test statistic and 1.59 as your critical value for a right-tailed test. Which of the following is the correct decision statement for the test? A. Reject the null hypothesis B. Claim the null hypothesis i
Hypothesis Testing on One Variable
Perform hypothesis testing on one variable's data using the EXTRINSIC COLUMN. 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 determining its value from the sample data, comparing the obser
Z-Tests and T-Tests and Calculating Right-Tail P-Value
The Web-based company Oh Baby! Gifts has a goal of processing 95 percent of its orders on the same day they are received. If 485 out of the next 500 orders are processed on the same day, would this prove that they are exceeding their goal, using alpha = .025 (See story.news.yahoo.com accessed June 25, 2004.) An auditor review
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent
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 devi
Hypothesis Statement Formation: Case Study
Based on the attached data set information, it is required to form a hypothesis statement as outlined below. Thank you in advance for your help! 1. What data are you going to use? What sections of the data set are you going to use? Make sure it is ratio or interval numerical data you are going to use. 2. What is your r
Statistics Materials Covering Chi-Square Goodness
Please read the questions carefully and use Excel to solve the problems. Thank you. One hundred people were asked which of four brands of Cola they preferred... (The material covers Chi-Square Goodness of Fit Tests, Contingency Tables, One-Factor Analysis of Variance, and Two-Factor Analysis.) (Please use Excel to solve
Statistics: Solve Using Alpha Value
The web-based company Oh Baby! Gifts has a goal of processing 95 percent of its orders on the same day they are received. If 485 out of the next 500 orders are processed on the same day, would this prove that they are exceeding their goal, using a=.025?
At the 0.01 level of significance, is the true mean of fax transmissions greater than 10?
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 de
One Sample Hypothesis Testing for Research Issue
Please hep with the following assignment: Formulate both a numerical and verbal hypothesis statement regarding your research issue. Verbal: The average (mean) cost of a three bedroom home is less than or equal to $250,000. Null Hypothesis: Ho: u < $250,000 Alternate Hypothesis: Ha u > $250,000 We all know the av
Conducting Baseline Analysis
Data was collected from a random sample of eight men and 10 women currently undergoing treatment for hypertension. Each person reported the number of cigarettes smoked each day and each was assigned a numerical value representing their risk of cardiovascular disease (CVD). The risk assessment was a number from 0 - 100 and was ba