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    Hypothesis Testing

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    The solution to Test of mean

    1. A sample of 45 overweight men participated in an exercise program. At the conclusion of the program 32 had lost weight. At the .05 significance level, can we conclude the program is effective? a. State the null hypothesis and the alternate hypothesis. b. State the decision rule. c. Compute the value of the test statisti

    Do we reject the null hypothesis?

    What would be the conclusions from the ANOVA analysis below regarding the null hypothesis? Do we reject the null hypothesis? (see data in the attached file)

    Hospitals in Tulsa, Oklahoma

    There are three hospitals in the Tulsa, Oklahoma, area. The following data show the number of outpatient surgeries performed at each hospital last week. At the .05 significance level, can we conclude there is a difference in the mean number of surgeries performed by hospital or by day of the week? Number of Surgeries Perfor

    Hypothesis testing-difference between means

    The manager of a computer software company wishes to study the number of hours senior executives spend at their desktop computers by type of industry. The manager selected a sample of five executives from each of three industries. At the .05 significance level, can she conclude there is a difference in the mean number of hours s

    Testing of hypothesis mean

    The average height of a particular plant is known to be 78 cms. The average height of 20 plants to which a particular manure was applied was found to be 85 cms. Assuming the heights are distributed normally with standard deviation 10. Examine whether the average height as increased by applying manure

    Size and power of the test

    If X1,X2,...,Xn is a random sample of size n from a Bernoulli population with parameter p such that P(X=1)=1-P(X=0)=p. Then to test Ho: p=po, if the critical region is taken as X1+X2+...+Xn<=n-2. Find the size of the test and obtain an expression for power function.

    Statistics: Hypothesis testing

    An industry safety program was recently instituted in the pharmaceutical industry. The weekly average losses (averaged over 1 month) in man-hours due to accidents in 10 similar plants before and after the program are as follows: PLANT BEFORE AFTER 1 30.5 23.0 2 18.5 21.0 3 24.5 22.0 4 32.0 28.5 5 16.0 14.5 6 15.0 15.5

    Hypothesis Test for Proportion for Mall

    The chief of security for the Mall of the Dakotas was directed to study the problem of missing goods. He selected a sample of 100 boxes that had been tampered with and ascertained that for 60 of the boxes, the missing pants, shoes, and so on were attributed to shoplifting. For 30 other boxes employees had stolen the goods, and f

    Classic Golf, Inc.

    Classic Golf, Inc. manages five courses in the Jacksonville, Florida, area. The Director wishes to study the number of rounds of golf played per weekday at the five courses. He gathered the following sample information. Day Rounds Monday 124 Tuesday 74 Wednesday

    To test if there is significant difference in mean funds.

    These are word problems concerning hypothesis theory. --- A financial planner wants to compare the yield of income- and growth-oriented mutual funds. Fifty thousand dollars is invested in each of a sample of 35 income-oriented and 40 growth-oriented funds. The mean increase for a two-year period for the income funds is 1100 w

    Paired Samples Hypothesis Test of Outpatient Surgeries

    There are three hospitals in the Tulsa, Oklahoma, area. The following data show the number of outpatient surgeries performed at each hospital last week. At the .05 significance level, can we conclude there is a difference in the mean number of surgeries performed by hospital or by day of the week? Day # of surgeries perfo

    To test if there is significant change in sales person's weekly salary

    Note: Use the five-step hypothesis testing procedure to solve the following exercises. 21. The management of Discount Furniture, a chain of discount furniture stores in the Northeast, designed an incentive plan for salespeople. To evaluate this innovative plan, 12 salespeople were selected at random, and their weekly incomes

    The 5 Step Hypothesis Testing Process

    How would you use these the 5 step hypothesis testing process to solve this problem at the 5% level of significance... you have been asked to show that average salary for a group of professionals is greater than $ 75,000; you sample 100 professionals ... and get a sample mean of $77,500 with a sample standard deviation of $

    To test if the job satisfaction is more in men then in women

    Using American Intellectual Union, AIU's large database of survey responses from the Unit 1 individual project, complete all of the following: 1. Work through a t-test to compare the means of two groups of data. One possible example is to compare the tenure of females to the tenure of males. Select one of the quantitative var

    Level of Significance, Male/Female Examination Sample Scores

    A sample of scores on an examination given to both males and females is: Males 72, 69, 98, 66, 85, 76, 79, 80, and 77 Females 81, 67, 90, 78, 81, 80, and 76 At the .01 level of significance, is the mean grade of the female students higher than that of the males?

    Test hypothesis of annual incomes of corporate trainers in New York.

    A study was conducted on the annual incomes of corporate trainers in the state of New York in metropolitan areas having a population less than 100,000 and in metropolitan areas having a population over 500,000. Some sample statistics are: SAMPLE STATISTIC POPULATION LESS THAN 100K POPULATION MORE THAN 500K Sample Size 45 60

    How do you conduct a five-step hypothesis test for XYZ Corporation?

    The new director of special programs in XYZ Corporation felt the customers were waiting too long to receive and complete forms needed to enroll in special programs. After collecting some data, Ms. Jones determined the mean wait time was 28 minutes. She felt this time period was excessive and she instituted new procedures to st

    Hypothesis Testing: Anthropological Report on the Status of Women

    Based on anthropological reports in which the status of women is scored on a 10-point scale, the mean and standard deviation across many cultures are known. A new culture is found in which there is an unusual family arrangement. The status of women is also rated in this culture. So cultures with this kind of unusual family arra

    Do Canadian children whose parents are librarians do better

    Do Canadian children whose parents are librarians do better than Canadian children in general on reading ability? (a) indicate what two populations are being compared, (b) state the research hypothesis, (c) state the null hypothesis, and (d) say whether you should use a one-tailed or two-tailed test and why.

    Hypothesis/Null Haypothesis

    3-8. For each of the following, (a) indicate what two populations are being compared, (b) state the research hypothesis, (c) state the null hypothesis, and (d) say whether you should use a onetailed or two-tailed test and why. (i) Do Canadian children whose parents are librarians do better than Canadian children in general on

    Random variables, Expected Values, Chi-Square and Levels of Significance

    Question 8: In business, time is money. A local entrepreneur wants to start a regional 24/7 package delivery service for businesses along the front range. A key planning assumption is that, with Colorado Springs as the collection and distribution hub, package delivery times throughout this region will follow a Normal Probabil