A person randomly selected 100 checks and recorded the cents portions of those checks. The table below lists those cents potions categorized according to the indicated values. Use a 0.10 significance level to test the claim that the four categories are equally likely. The person expected that many checks for whole dollar amounts
A research team conducted a study of soft-drink preferences among residents in a test market prior to an advertising campaign for a new cola product. Of the participants, 130 are teenagers and 130 are adults. The researchers secured the following results: Teenagers: Cola 50 Nocola 80 Adults: Cola 90 Nocola 40 C
7. For full time employees only (variable wrkstat equals 1), make a crosstabulation of satjob and respondent's income in quartiles (youmust calculate this variable yourself-call it income4). For each cell, obtain the appropriate percentagess, observed and expected cell counts, and residuals. Also obtain the chi-square statistic
I need help figuring out how to do this assignment: Lilly collects data on a sample of 40 high school students to evaluate whether the proportion of female high school students who take advanced math courses in high school varies depending upon whether they have been raised primarily by their father or by both their mother an
Lemon Corporation, an automobile manufacturer, is trying to determine the source of defects in some of its autos. Rumor has it that on Mondays large numbers of Lemon auto workers are hung over from a weekend of drunkenness and debauchery and are, therefore, more likely to make mistakes on the job. In order to test the hypothesi
1) Describe the chi-square test of independence. 2) How is this test different from the chi-square goodness-of-fit test? 3) Are the assumptions underlying each of these tests the same? 4) When presented with nonparametric data how do you know which of these tests to use?
This week introduces the chi-square goodness-of-fit-test, which looks for differences across independent groups. Since this is similar to the independent t-test, which looks for differences between independent groups, 1). Discuss what each of these tests is actually measuring. 2). Be sure that your discussion address
Please help me to understand these concepts: 1. What is the null hypothesis in a chi-squared test of independence? 2. How many "tails" can a chi-squared test have, one or two? 3. In a regression analysis, what do the residuals from the fitted line add up to? 4. List the assumptions under which the linear regression model is
Lilly collects data on a sample of 40 high school students to evaluate whether the proportion of female high school students who take advanced math courses in high school varies depending upon whether they have been raised primarily by their father or by both their mother and their father. Two variables are found below in the d
The shopping behavior of consumers in different types of stores was studied. Data were collected on buying patterns and income levels. A cross-classification table of buying pattern versus income levels for 200 consumers in the sample is reproduced below. a. State in English the null and alternate hypothesis. b. For each
1.) A worker in an insurance company processes claims. The distribution of the number of claims processed each day in a week of this worker's life is as follows. Day # of Claims Monday 28 Tuesday 45 Wednesday 40 Thursday 23 Friday 29 The worker's boss thinks the worker's claims processing is sporadic and is not evenly
Week 5 homework Chi-Squares You are a general manager at a resort in Hilton Head, South Carolina. To analyze activity and sales, you are interested in studying the number of rounds of golf played by members per weekday. The following sample information is collected over 440 rounds: Day of the Week Number of Rounds M
State the statistical assumptions for this test. Using the data set you have selected, choose independent and dependent variables. Develop the null hypothesis and the alternative hypothesis. Use SPSS to calculate a chi-square. Decide whether to reject or retain the null hypothesis. Generate syntax and output files
A Managers Dilemma of Buying Smartphones The procurement manager of a large company was assigned with buying new smartphones for 500 employees. The manager sent out requests for proposals to three companies: AT&B, Horizon and E-Mobile. All three companies responded and the manager saw that he could get the best deal from Hori
Statistics: Mean life of light bulb with 90% confidence interval, distribution of worker insurance claims by day of week.
A random sample of light bulbs had a mean life of xbar = 587 hours. the standard deviation of the lifetime of all such light bulbs is of sigma = 36 hours #1 construct a 90% confidence interval estimate of the mean life, m, of all light bulbs of this type. It was expected that the mean lifetime of the bulbs was 600 hours.
5. A car manufacturer has four plants, say Plants A,B,C and D. The CEO would like to know if worker ratings differ among the four plants. You (VP of HR) must decide if the workers rating differ proportionately among the plants. You randomly select 239 worker ratings from the four plants. The table below shows the number of wo
Exercise 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 a = .01, is the degree of certainty independent of credits earned?
Chi-Square Test: Marital status of shoppers; car purchase vs gender; how males vs females pay their bills
For the three problems: A) State the hypotheses and identify the claim B) Find the critical value(s) C) Compute the test value D) Make the decision E) Summarize the results Please us the traditional method of hypothesis testing. 1: A researcher reads that the marital status of U.S. adults is distributed as follow
M&Ms has more recently updated its color distribution pattern to Red: 13%, Yellow: 14%, Green: 16%, Orange 20%, Blue: 24%, Brown: 13%. ------------------------------------------ Perform hypothesis tests (at a 5% level of significance) to determine: 1. Are the class total proportions representative of the current (upda
A researcher is investigating the physical characteristics that influence whether a person's face is judged as beautiful. The researcher selects a photograph of a woman and then created two modifications of the photo by 1. moving the eyes slightly farther apart and 2. moving the eyes slightly closer together. The original photog
See attached data file. Excel (Hypothesis Testing 2) In a survey for its advertisers, a newspaper chain randomly sampled 100 readers of each of its 3 major newspapers, with the results in the attached excel file. Social Class Newspaper 1 Newspaper 2 Newspaper 3 Poor 31 11 12 Lower Middle Class 49 59 51 Middle Class 1
See attached file for symbols format. 1. A survey finds that, given the choice, 34 females prefer males much taller than themselves, and 55 females prefer males only slightly taller than themselves. A) What procedure should we perform? B) What are H0 and Ha? C) With α=.05, what do you conclude about the preferences
II. In a sample of 664 patients who received this training, suppose that 47 showed reduced allergic reactions and 17 showed increased allergic reactions. Are these results sufficient to conclude that the self hypothesis has a significant effect. Assume that increasing and decreasing allergic reactions are equally likely if the
The Iowa Department of Transportation is concerned with the use of cellphones while driving. It commissioned a survey of drivers to see what relationship there might be between use of cellphones and accidents. The survey yielded the following data: Had an accident Di
See attached file for problem. Dependent Variable - Interested in economic issues and Business conditions. Independent Variable - Last week were you working full time... Control Variable -Respondents age We can use analysis as a method to show relationships between different variables. The desired results will be th
1. A study is being conducted to determine whether there is a relationship between jogging and blood pressure. A random sample of 210 subjects is selected, and they are classified as shown in the following table. At ± = 0.05, test the claim that jogging and blood pressure are not related. (apply chi-square independent test)
As the price of oil rises, there is increased worldwide interest in alternate sources of energy. A Financial Times/Harris Poll surveyed people in six countries to assess attitudes toward a variety of alternate forms of energy (Harris Interactive website, February 27, 2008). The data in the following table are a portion of the po
Scenario: Banner Mattress and Furniture Company wishes to study the number of credit applications received per day for the last 300 days. The information is reported as follows: Number of credit applications Frequency (Number of days) 0 50 1
Please solve the exercise below: At a recent meeting of educational researchers comparison were made between the type of college freshmen attend and the numbers who drop out. A random sample of freshmen show the following results: (keep two decimals in calculating expected frequencies) 4Yr public 4Yr pr
Please solve the exercise below in Excel and show your work (and formulas) 5. In the past, of all the students enrolled in "Basic Business Statistics" 10% earned A's 20% earned B's, 30% earned C's, 20% earned D's and the rest either failed or withdrew from the course. Dr Johnson is a new professor teaching "Basic Business S