### Chi-Square Test

Collapse the response categories in the following table so that it meets the assumption of the chi-square test; then perform the test. OWNERSHIP Education Owners Non-owners Less than grade 8

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Collapse the response categories in the following table so that it meets the assumption of the chi-square test; then perform the test. OWNERSHIP Education Owners Non-owners Less than grade 8

Perform a chi-square test on the following data: (a) Regulation is the best way to ensure a safe workplace. Managers Blue-Collar Workers Agree 58 66 Disagree

The owner of a mail-order catalog would like to compare her sales with the geographic distribution of the population. According to the United States Bureau of the Census, 21 percent of the population lives in the Northeast, 24 percent in the Midwest, 35 percent in the South, and 20 percent in the West. Listed below is a breakdow

12.67 The sales representative performed an experiment to test whether sending the complete program tapes for review by customers would increase sales. They selected 80 customers from the mailing list and randomly assigned 40 to receive the sample tapes and 40 to receive the full-program tapes for review. They then determine

Quality Associates, Inc. is a consulting firm that advises its clients about sampling and statistical procedures that can be used to control manufacturing processes. In one case, a client provided Quality Associates with a sample of 800 observations that were taken during a time when the client's process was operating satisfacto

At a local supermarket receiving dock, the number of truck arrivals per day is recorded for 100 days. (a) Estimate the mean from the sample. (b) Calculate the expected frequencies assuming a Poisson distribution. Show your calculations in a spreadsheet format. (c) Carry out the chi-square test, combining end categories as nee

1. After tasting three different brands of Ammonia-Betel Nut Ice Cream, 100 tasters are asked to pick their favorite. The table below shows the number of tasters who prefer each type. Dr. Big Fingers Uncle Stain Scary Facebook Friend 39

Chi-square goodness-of-fit test The Ellington Dukes are a minor-league baseball team in Ellington, Georgia. As with most other minor-league teams, the Dukes rely heavily on promotions to bring fans to the ballpark. These promotions are typically aimed at fans of specific ages. The management for the Dukes has planned its curre

Define / describe in your own words the following terms and give an example of each. a. F distribution b. F statistic c. Chi-square distribution d. T distribution e. Dependent samples f. Independent samples g. Degrees of freedom h. T statistic i. Paired difference

An obstetrician wants to learn whether the amount of prenatal care and the wantedness of the pregnancy are associated. He randomly selects 939 women who had recently given birth and asks them to disclose whether their pregnancy was intended, unintended or mistimed. In addition they were to disclose when they started receiving pr

1. The speed of an airplane in miles per hour is a ___________________ variable. 2. A football team's rank is a ___________________________variable. 3. The __________________ for a set of data is found by adding all the data values and dividing by the number of items. 4. The range or the ______________________________ can be

In cases we do not know the underlying theoretical distribution we resort to non-parametric statistics. The Chi-square is such a statistic. Formal testing for evidence of discrimination in the bank supervisor case using the Chi-square statistic: This study found that 21 out of the 24 males were selected for promotion while

11. The bank credit card department of Carolina Bank knows from experience that 5% of the card holders have had some high school, 15% have completed high school, 25% have had some college, and 55% have completed college. Of the 500 card holders whose cards have been called in for failure to pay their charges this month, 50 had

A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location. Research question: At α = .05, does vehicle type vary by mall location? (Data are from a project by MBA students Steve Bennett, Alicia Morais, Steve Olson, and Greg Corda.) Vehicles Applied

Can people really identify their favorite brand of cola? Volunteers tasted Coca-Cola Classic, Pepsi, Diet Coke, and Diet Pepsi, with the results shown below. Research question: At alpha = .05, is the correctness of the prediction different for the two types of cola drinkers? Could you identify your favorite brand in this kind o

1. Select the best statistical analysis technique for the following research topics. Be very precise about your statistical choice. For example, there are several types of t tests, correlations, and ANOVA tests. Make sure you specify exactly which statistical analysis technique you would use, e.g. One-Way Anova. a. You wa

Fill in the P(X = x) values in the table below to give a legitimate probability distribution for the discrete random variable X, whose possible values are -2, -1, 4, 5, and 6. Value x of X P(X = x) -2 0.24 -1 0.19 4 0.12 5 6 Let X be a random variable with the following probability distribution Value x of X P(X =

Consider a large population of families with three children each. If the genders of children in any family are independent of one another, the number of male children in any family will have a binomial distribution based on three trials. Suppose a random sample of 160 families yields the following results. test significance leve

Explain what a Chi-Squared Test is used for and give an example how you could possibly use this test. What is an ANOVA test? Create an example where this test could be used. Compare and contrast parametric and non-parametric tests. What example can you give where the non-parametric test could be used?

A random group of apartments was selected from a city to analyze the number of bedrooms they have. Is there evidence to reject the hypothesis that the apartments are equally distributed between One Bedroom, Two Bedrooms, and Three Bedrooms apartments, at = .05? Types of Apartments One Bedroom Two Bedrooms Three Bedrooms

A charity solicits donations by phone. From long experience the charity's director reports that 60 percent of the calls will result in refusal to donate, 30 percent will request more information via the mail, and 10 percent will result in an immediate credit card donation. For a sample of 200 calls last week, 140 refused to don

These hitter data were collected on 6-23-2004 and represent the top 50 hitters in Major League Baseball on that date. Perform the following analyses on the data, interpret your findings and summarize what each analysis means. 1. Chi square analysis - Do th

NEED TO USE ATTACHED SPREADSHEET, ALL CALCULATIONS IN EXCEL I need to determine whether the distribution of 100 scores in normally distributed. (see attached spreadsheet and please use template for answers) Perform a chi-square goodness-of-fit test. Report and interpret the computed p-value. What can you conclude about norm

Are birthdays "even distributed" throughout the year, or are they more common during some parts of the year than others? Owners of a children's toy store chain in the Northwest asked just this question. Some data collected by the chain are summarized in Table 1 below. The data were obtained from a random sample of 180 people

Variables and Level of Measurement Length: One sentence per variable Identify the dependent and independent variables used in this paper, and their level of measurement (attribute or numeric). Methodology (using Chi-Square) Determine the appropriate statistical tool to test the hypothesis. Use Doane's 4-step hypothesis You

Compute a chi-square test for goodness of fit for each of the following, using the .05 level for each. In each problem, the expected distribution is equal frequencies in each category. 1. 5 10 5 2. 10 15 10 3. 10 20 10 4. 5 15 5

Does lecithin enhance memory? To test this idea, nine pairs of people matched in terms of age, sex, IQ and neurological status are given capsules containing either lecithin or a placebo at meals for a week. All are scored on a recent memory talk. A higher score indicates better task performance. pair lecithin Placebo 1

Can people really identify their favorite brand of cola? Volunteers tasted Coca-Cola Classic, Pepsi, Diet Coke, and Diet Pepsi, with the results shown below. Use α = .05 Research question: Is the correctness of the prediction different for the two types of cola drinkers? Correct? Regular Coke Diet Coke Row Total

A student team examined parked cars in four different suburban shopping malls. One hundred vehicles were examined in each location. Use α = 0.05 Research question: Does vehicle type vary by mall location? Vehicle Type Somerset Oakland Great Lakes Jamestown Total Car 44 49 36

A social scientist sampled 140 people and classified them according to income level and whether or not they played a state lottery in the last month. The sample information is reported below. Is it reasonable to conclude that playing the lottery is related to income level? Use the .05 significance level Income Low Mid