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Hypothesis Testing

P value calculation and interpretation

Gibbs Baby Food Company wishes to compare the weight gain of infants using its brand versus its competitor's. A sample of 40 babies using the Gibbs products revealed a mean weight gain of 7.6 pounds in the first three months after birth. For the Gibbs brand the population standard deviation of the sample is 2.3 pounds. A sample

4 questions on Hypothesis testing and SSR, SST

1.Explain how you decide what statement goes into the null hypothesis and what statement go into the alternative hypothesis. 2. What is a critical value? 3. What is Alpha and how is it related to the p-value?

Hypothesis Testing : analysis

Given the following hypothesis: H0: µ<10 H1: µ>10 For a random sample of 10 observations, the sample mean was 12 and the sample standard deviation 3. Using the .05 significance level: a. State the decision rule. b. Compute the value of the test statistic. c. What is your decision regarding the null hypothesis?

Significance Level

The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart. The mean assembly time for a random sample of 24 carts, using the new method, was 40.6 minutes, and the standard deviation of the sample was 2.7 minutes. Using

Hypothesis Testing

The president of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies. He selects a sample of 15 families, some with only a single insured driver, others with several teenage drivers, and pays each family a stipend to contact the two companies and ask for a price q

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

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: &#61555;12 &#8804; &#61555;22 H1: &#61555;12 > &#61555;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

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

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 &#945; = .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

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

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 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?

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

Hypothesis Testing: Level of Significance and Average Capacities

1. A study has been made to compare the nicotine contents of two brands of cigarettes. Ten cigarettes of Brand A have an average nicotine content of 3.1 milligrams with a standard deviation of .5 milligrams, while 8 cigarettes of Brand B have an average nicotine content on 2.7 milligrams with a standard deviation of .7 milligram

Statistics of Students in Different Majors

15.18 Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major. Research question: At alpha = .01, is the degree of certainty independent of credits earned? 15.22 A student team examined parked cars in four diff

Mean vs. Hypothesized Value

Hypothesis Test: Mean vs. Hypothesized Value 250,000.0000 hypothesized value 214.4538 mean Data 34.7157 std. dev. 6.8083 std. error 26 n 25 df -36688.37 t 1.0000 p-value (one-tailed, upper) Team: Above are the calculations for our project which I performed in Megastat and then manually as well. I am