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    Hypothesis Testing

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    Testing of Hypothesis & Test of Mean

    3. Auto Insurance Commissioner Auto insurance premiums in Massachusetts depend on the age of the driver and the driver's record but are not supposed to depend on gender. The state insurance commissioner wants to investigate whether there is any difference in the average premium that company A charges males and the average pre

    Statistics Problem

    The Atlanta Convention & Visitors Bureau just released a report on the percentage of available hotel rooms in Fulton County that were rented (occupied) in 2003. Looking over the report you note that room occupancy in March of 2003 was 77.6% (total rooms available is 14,800) and in December of 2003 it was 55.5% (of the 14,600 av

    Using AIU's large database of survey responses complete all of the following:

    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 variables from the DataSet (include all 288 cases) and perform a t-test to determine if the Population mean is equal to 5.0. Ensure that you begin by st

    Testing Methods

    See the attached file. I would like some help to practice further inferential statistics; and test for instance that the proportion of employees female satisfied by their job could be higher than the proportion of males Ho p1<or = p2 H1 p1>p2 And I would like to practice another test according your choice (chi-square, co

    Test of hypothesis for proportions

    Suppose prior elections in Louisiana indicated it is necessary for a candidate for governor to receive at least 80 percent of the vote in the northern part of the state to be elected. The incumbent governor is interested in assessing his chances of returning to office and conducts a survey of 2,000 registered voters residing i

    Data Collecting and Analysis

    1. I need to collect both primary and secondary data regarding the research issue on salary of baseball players. (the aim of this research is to verify whether the salary of the baseball players varies with respect to the state). 2. I need to find two different sources of secondary data. 3. I need an analysis of the collec

    Test of means

    The Gibbs Baby Food Company wishes to compare the weight gain of infants using their brand versus their 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. The standard deviation of the sample was 2.3 pounds. A sample of 55 babies using the

    I need help matching statistical symbols and definitions

    I need your HELP with the matching of STATISTICAL SYMBOLS & DEFINITIONS DEFINITION 1.The average of the squared deviation scores from a distribution menas. 2. Midpoint in the distribution of numbers. 3. It has to do with the accuracy and precision of a measurement procedure. 4.Examines if an observed causal relationship

    Statistics Variable Identification

    A researcher has a data-set that includes the following variables measured on 50 small children. Given these variables: a) gender (male / female) b) age (continuous variable measured in months; ranges from 36 months to 72 months) c) preschool or daycare attendance (yes / no) d) height (continuous variable measured in

    Hypothesis test..

    An office equipment company advertises that it will deliver equipment within 15 days of purchase. A sample of 49 past deliveries is taken to test whether company's advertisement is valid. The delivery time for this sample was 16.2 days with a sample standard deviation of 5.6 days. Which of the following is correct * What is t

    Research and Evaluation

    1) A normal tomato will gain an average of 2 ounces per week during the growing season. A sample of 100 tomatoes is given a special hormone to increase their growth. The average weight gain of tomatoes in the sample was 3 ounces with a standard deviation of 1 ounce. Conduct a hypothesis test to determine if the hormone incre

    Analysis of CoffeeTime

    Tourism is one consideration for CoffeeTime's future. A survey of 1,233 visitors to Mumbai last year revealed that 110 visited a small café during their visit. Laura claims that 10% of tourists will include a visit to a café. Use a 0.05 significance level to test her claim. Would it be wise for her to use that claim in trying

    Hypothesis Testing for the Proportion Parameter

    Hypothesis Testing for the Proportion Parameter 1.) It is thought that the front cover and the nature of the first question on mail surveys influence the response rate. The article "The Impact of cover Design and First Question on Response Rates for a Mail Survey of Skydivers" (Leisure Science, 1991) tested this theory by exp

    Tourism Hypothesis Testing

    Tourism is one consideration for CoffeeTime's future. A survey of 1,233 visitors to Mumbai last year revealed that 110 visited a small café during their visit. Laura claims that 10% of tourists will include a visit to a café. Use a 0.05 significance level to test her claim.

    Testing of hypothesis of means

    To test if the population mean is greater than 20 . We use z-test to test if the population mean is > 20 . We also use z-test to test if there is significant difference between means. See attached file for full problem description.

    Descriptive Statistics of Hispanic Aid Support

    (See attached file for full problem description and proper table representation) 1) Descriptive statistics: Please interpret this data a provide a description of the data represents. As you compare the means visually, what is your first impression about the difference in these means? Hispanic Women Hispanic Men Non- Hispa

    Type I and Type II Errors in Hypothesis Testing

    For each of the following situations, indicate whether an error has occurred and, if so, indicate what kind of error (Type I or Type II) has occurred. a. We do not reject Ho and Ho is true. b. We reject Ho and Ho is true c. We do not reject Ho and Ho is false. d. We reject Ho and Ho is false.

    Regression analysis: education and salary

    Use the dataset "Employee data" (attached). Perform a regression that studies the impact of years of education on current salary. 1.(a) How may we interpret the coefficient for education? (b) Is the coefficient for education significant at the 5% level? (C ) What hypotheses are being tested by the t-statistic? (d) What

    Statistics of Unabraded and Abraded Fabrics

    Consider the accompanying data on breaking load (kg/25mm width) for various fabrics in both an unabraded condition and abraded condition. ("The effect of wet abrasive wear on the tensile properties of cotton and polyester-cotton fabrics," J.Testing and Evaluation, 1993: 84-93). Use the paired t-test, as did the authors of the ci

    Hypothesis testing and P-Values

    For which of the given P-values would the null hypothesis be rejected when performing a level .05 test? a) .001 b) .021 c) .078 d) .047 e) .148

    Room Size and BTUs

    Based on the question and the bogus raw data, provide a complete analysis. Be sure to include statdisk or excel: Does the room size play an important factor in choosing the correct BTU's? A general rule is that 5,000 to 6,000 Btu/hrs. models cool rooms 100 to 300 square feet; 7,000 to 8,200 Btu/hr. models cool rooms 250 to 55

    Testing for Difference in Variation of Two Populations

    he following hypotheses are given. A random sample of eight observations from the first population resulted in a standard deviation of 10. A random sample of six observations from the second population resulted in a standard deviation of 7. At the .02 significance level, is there a difference in the variation of the two

    Hypothesis testing and variation

    12-4 The following hypotheses are given. A random sample of five observations from the first population resulted in a standard deviation of 12. A random sample of seven observations from the second population showed a standard deviation of 7. At the .01 significance level, is there more variation in the first population?

    Statistics Concepts and Calculations

    16-22. The following sample data were obtained from three populations where the variances were not equal, and you wish to compare the populations. Sample 1 Sample 2 Sample 3 21 15 38 29 17 40 35 22 44 45 27 51 56 31 53 71 1. State the null hypothesis. 2. Using the .01 level of risk, state the decision rule. 3. C

    Significance testing in 5 different situations

    1. Suppose you want to test the claim that the population mean(u) is < or equal to 25.6. Given a sample size of n=44 and a level of significance of 0.05, when should you reject the null hypothesis? 2. Given the null hypothesis: population mean = 25 and the alternative hypothesis population mean not equal to 25, and P=0.041

    One-Tailed Tests for Population Standard Deviation of Mean Income of Teachers

    Past records suggest that the mean annual income, u1, of teachers in state of Utah is greater than or equal to the mean annual income, u2, of teachers in Oregon. In a current study, a random sample of 10 teachers from Utah and an independent random sample of 10 teachers from Oregon have been asked to report their mean annual inc

    Hypothesis Testing - Annual Income in Pennsylvania

    Past records suggest that the mean annual income, u1, of teachers in state of Pennsylvania is less than or equal to the mean annual income, u2, of teachers in Illinois. In a current study, a random sample of 15 teachers from Pennsylvania and an independent random sample of 15 teachers from Illinois have been asked to report thei